Connecticut Mineral Specimens For Sale

 

   

                            Calcite on Quartz                                                          Calcite, Quartz, Prehnite                                                                                                        Quartz

 

We have been lucky enough to acquire some of the finest examples of Connecticut minerals directly from the field collectors who have gained legal access to the active quarries as well as numerous older collections built in the 1950s through the 1990s.  If you are a serious East Coast or Connecticut collector it might be worth your while to contact us regarding better materials which we show by enquiry only.

 

 

 

OKP-445

OKP-445    Chalcocite with Calcite    Bristol Copper Mine, Bristol, Connecticut.  Ex. Dr. Steve Chamberlain collection.  This example of classic chalcocite measures 3.1 x 2 x 1.6 cm.  There are crystallized area, noncrystallized areas, and areas with breakage, as seen.  The top of the piece is very nicely crystallized and views well from several direction.  I assume someone will trim this up into a very nice TN sized specimen from this historic east coast locality.  $175

 

 

 

 

 

OKG-073

OKG-073      Calcite with Quartz      Roncari Quarry, (Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This is a smaller example of the rare hematite phantomed calcites unique to this find.  The piece is 6.4 x 4 x 2.9 cm and has numerous calcite crystals showing silver and reddish brown hematite, selective face phantoms.  No damage tot he body of piece but the edges are rough and one end could use trimming.  $95

 

 

 

 

 

OKG-068

OKG-068      Quartz and Calcite on Stalactite      Roncari Quarry, (Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand. This odd looking piece measures 7.5 x 4.8 x 4 cm is mainly a large stalactite with a healed end.  The only contact is on the base it sits on so it views beautifully from any direction.  Lots of tiny inclusions and surface hematite spots on the calcites while most of the quartz remained water clear.  $175

 

 

 

 

 

OKG-531

Back showing casts

OKG-531      Calcite and Quartz     Roncari Quarry, (Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This piece is a set of large calcites on clear quartz and measures in at 7.1 x 5 x 3.6 cm.  There is no damage and the piece has excellent aesthetics.  The back (or base) is botryoidal casts after???  $100

 

 

 

 

 

OKP-420

OKP-420      Quartz, Calcite, Hematite      Roncari Quarry, (Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  Tis attractive cluster of crystals is 6 x 4 x 2.3 cm.  The back/base, and edges are all healed surfaces.  No damage.  Tiny blades and balls of hematite as inclusions and on surfaces of the quartz and calcite.  This is an excellent representative specimen.  $60

 

 

 

 

 

OKP-418

Back

OKP-418      Quartz, Hematite, Calcite, Goethite after ?      Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This mixed mineral piece measures 7 x 5.1 x 3.2 cm.  It is crystallized on all sides except its base and a small area on top (it is met to be displayed as seen in the first image).  Red hematite balls on quartz and the calcites are obvious.  Dark brown crystals of what looks like marcasite appear to be replaced by goethite.  Minor damage to quartz as seen and a couple small calcite cleaves on back.  Excellent condition overall.  $150

 

 

 

 

 

OKP-419

OKP-419      Calcite and Quartz      Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This specimen offers clear calcites with selective face overgrowths of hematite.  The piece measures 5.5 x 5.3 x 3.4 cm.  High luster and nice contrasts.  No damage.  $70

 

 

 

 

 

OKG-022

OKG-022      Calcite, Prehnite, Quartz      Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This specimen measures 7.5 x 6.8 x 4.5 cm overall and is crystallized on all sides.  There are the usual nice things such as selective face coatings and interesting and complex calcites but these have a nice coating of green prehnites.  It is in wonderful condition showing a tiny cleave on one calcite (I found it with magnification). and only this smallest of contacts on the pointed end that faces to the lower left in the first image.  $295

 

 

 

 

 

OKG-282

OKG-282      Quartz cast after Anhydrite      Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This is a very large crystal cast that measures 6.3 x 5.4 x 2.7 cm in largest dimensions (5.1 cm on longest edge).  One tiny quartz crystal in center of piece is broken off but difficult to notice.  Attached casts at base of piece with one being incomplete.  This is a fine example of one of these important specimens.  $225

 

 

 

 

 

OKG-316

OKG-316      Quartz and Calcite on Stalactite       Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This stalactite is 9.2 x 4 x 3.4 cm.  It is actually two stalactites in parallel growth that have grown together.  Two very tiny rubs on back.  Displays wonderfully from any direction.  A couple calcites show interesting healed surfaces.  The luster is better than the images indicate.  Great piece!  $350

 

 

 

 

 

OKG-652

OKG-652      Quartz and Calcite on Stalactites       Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This is an interesting miniature that measures 4.5 x 3 x 3 cm.  It is a floater with healed stalactites and a large clear calcite making up the body of the specimen.  Some of the quartz are clear, others have a bluish chalcedony like coating on parts of their prisms.  It is damage-free, aesthetic and interesting.  $150

 

 

 

 

 

OKG-075

Base

OKG-075      Quartz and Hematite       Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This 6.1 x 5.1 x 3.4 cm piece is made up of clear beta-form quartz crystals on quartz druse.  There are a few blades of brown and a few silver hematites.  Also, brown hematite balls.  No damage, edge contacts on matrix.  Very nice for this rarest of the quartz forms from this quarry.  $95

 

 

 

 

 

OKG-253

OKG-253      Datolite, Quartz, Calcite       Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This is a plate of large, transparent to translucent datolite crystals of a very light green color.  The plate is equally nice on either side with crystals to 3.5 cm each. The piece is 7 x 5 x 2.9 cm.  The tan/browns are quartz druse overgrowths and there are a couple tiny calcites as well as some prehnite intergrown in the base.  I consider the base to be the edge that it sits up on nicely for display.  This is the only area of contact and all visible surfaces are damage free and aesthetic.  This is the second nicest datolite specimen I have seen from this quarry and what I would consider an important east coast specimen.  Better in person.  $800

 

 

 

 

 

OKG-086

OKG-086      Hematite, Calcite, Quartz with Quartz Stalactites   Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This This is an 8.5 x 5.5 x 3 cm piece that kind of defies description.  The piece is really one elongated, complex calcite with a large crystal coming out of it at about an 80 degree angle.  The end has small stalactites intergrown into it.  Tiny brown hematite ball are seen on all surfaces and one one of the calcites in a linear arrangement (see center of last image).  Large variations in luster.  Only two SMALL contacts on the end of stalactite and that same end of piece.  Excellent condition, interesting and unusual.  $180

 

 

 

 

 

OKG-425

Back

OKG-425      Calcite on Prehnite and Epidote      Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  The plate of crystals seen here measures 7.6 x 5.2 x 2.3 cm.  The epidote is bright green and lustrous, the prehnite satin in luster and a medium green color, and the calcites are an interesting and unusual crystal form, lustrous and transparent.  Only the smallest of touch marks in one spot, near edge, visible with magnification.  A very unusual and uncommon piece in several ways.  $250

 

 

 

 

 

OKG-269

OKG-269      Quartz cast after Anhydrite      Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This piece is numerous casts totaling 5 x 4.1 x 3.4 cm in size.  Good views all around with only a small contact on one cast at top of specimen.  $150

 

 

 

 

 

OKP-433

OKP-433      Calcite, Hematite, Quartz       Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This cabinet specimen measures 12.2 x 10 x 7.7 cm and has complex crystals of calcite to 4.4 cm each.  Interesting selective face phantoms are found within each crystal as well as selective face surface coatings of gray and brown hematite.  Hematite roses in these same colors are also present on the quartz crystal matrix.  No damage.  Calcite with phantoms are very rare at this occurrence.  $375

 

 

 

 

 

OKP-430

Back

OKP-430      Quartz casts after Anhydrite with Quartz and ???      Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This specimen id from what Jerry nicknamed the "Halloween Pocket", for the crazy crystal colorations he encountered.  This is probably the best piece from the find.  It measures 18.5 x 10.2 x 9 cm and is basically a large vug that sits nicely on edge, as seen in the photos.  Inside can be seen calcites with odd coatings or pseudomorphing of a nice orange color.  On these are "stars" of what is likely goethite but not confirmed.  Also inside the vug are fine quartz casts after anhydrite to approximately 3 cm.  The back of the piece is totally coated by calcites similar, but smaller, than those in the vug on the front.  The contact is along the edges of the vug but not all of them.  Overall the condition is excellent .  An extremely interesting and unusual specimen in many ways.  $1,400

 

 

 

 

 

OKG-409

OKG-409      Calcite on Quartz casts after Anhydrite       Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This is a very large example of this material measuring 7 x 6 x 3 cm.  The larges calcite is 3.2 cm and has a tip cleave.  Other than this the specimen is in fine condition on all sides.  Most of these came out badly damaged so this is a very fine example.  $300

 

 

 

 

 

OKP-432

OKP-432      Calcite, Hematite, Quartz       Roncari Quarry, Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  This cabinet specimen measures 13.4 x 10 x 6.5 cm and has complex crystals of calcite to 3.8 cm each.  Interesting selective face phantoms are found within each crystal.  Even the tiny crystals show these interesting phantoms.  The phantom colors range from gray, to silver, to brown.  The surface features also often reflect parallel growth with the phantoms.  Very unusual for any calcite locality.  No damage.  Calcite with phantoms are very rare at this occurrence and this is among the few very finest ever found.  This would be an important specimen for the Roncari.    $2,800

 

 

 

 

 

OKO-475

OKO-475    Almandine     Greens Garnet Farm, Roxbury, Connecticut.  Ex. Paul and Dawne Dunning collection.  This is a very attractive example of this once common material.  It measures 3 x 2.7 x 1.4 cm and is in very god condition with only a tiny contact from schist on the large crystal and a small ding on the small crystal.  Well exposed with good views from all directions.  Mounted in a perky box.  $30

 

 

 

 

 

OKO-400

OKO-400      Quartz     New Britain, Connecticut.  Ex. Paul and Dawne Dunning collection.  3.3 x 2.8 x 2.7 cm crystal.  Tiny mico tip ding that is difficult to detect.  The piece is translucent and has excellent form.  So Styrofoam on base.   $25

 

 

 

 

 

OKO-401

OKO-401      Tourmaline     Connecticut.  Ex. Paul and Dawne Dunning collection.  This highly striated tourmaline appears to be a deep green to black color, is not terminated and is mounted in a perky box.  3 x 1 x .9 cm.  $15

 

 

 

 

 

OKO-997

OKO-997     Datolite     Roncari Quarry, East Granby, Connecticut.  Ex. Paul and Dawne Dunning collection.  This example composed of beautifully formed, clear, high luster crystal high on a section of matrix.  It measures 3 x 2.3 x 2.2 cm and is quite flashy.  No damage.  $35

 

 

 

 

 

OKO-196

OKO-196    Stilbite    Road Cut near Thomaston Dam, Connecticut.  Ex. Dr. Steve Chamberlain collection.  A fine crystal (minor bowtie form) crystal on matrix.  No damage.  Very uncommon material.  Classic East Coast specimen.  $50

 

 

 

 

 

OKJ-888

OKJ-888       Natrolite      Cheshire, Connecticut.  Ex. Paul and Dawne Dunning collection.  An interesting spray of acicular, clear crystals to 1.5 cm each.  Unusual location.  2.3 x 2 x 1.4 cm.  No damage.  Mounted in a perky box.    $25

 

 

 

 

 

 

OKN-598

OKN-598    Fluorite    Thomaston Dam Site, Thomaston, Connecticut.  Ex. Paul and Dawne Dunning collection.  Typical example as seen here.  This one is light purple measuring 2.7 x 2.1 x 1.4 cm.  No damage.  Closed location.  $20

 

 

 

 

 

 

OKL-166

OKL-166    Beryl     Gillette Quarry, Haddan Neck, Connecticut.  Ex. Dr. Steve Chamberlain Collection.  A 1.9 x 1.5 x 1.4 cm example that is double terminated (base is only partially terminated.  In good condition.  Light green color, high luster and minor gemmy areas.  Excellent for the location.  $45

 

 

 

 

 

OKL-800

OKL-800     Sphalerite and Quartz on Galena       Rt. #25 Road Cut, Trumbull, Connecticut.  Ex. Thomas Fowler collection.  2.5 x 2.1 x 1.6 cm specimen with galena cubes to 1 cm on edge.  Bright translucent sphalerites on the galena with clear quartz points.  Galena corners look not to be fully formed... patina is consistent (I don't think this is damage but I might be wrong).  Mounted in a perky box.  Attractive and unusual and nice for the location.  $90

 

 

 

 

 

OKG-119

OKG-119     Apophyllite on Calcite and Quartz      Roncari Quarry Tilcon Quarry), East Granby, Hartford, Connecticut. 6 x 5.6 x 3.5 cm specimen with a nice mix of species.  The apophyllite balls rest on top section of calcite with quartz points.  Edge contacts and one spot with an apophyllite ball missing.  Not distracting, just not very noticeable at all.  A good example of less common material from this important find.  $145

 

 

 

 

 

OKL-134

OKL-134    Sphalerite, Quartz     Trumbull, Connecticut.  Ex. Thomas Fowler collection.  A large, for the location specimen with small translucent sphalerites and milky quartz.  Good luster and no damage.  7.6 x 4 x 2.5 cm.  Mounted in a large perky box.  $150

 

 

 

 

 

 

OKL-135

OKL-135     Columbite      Biermann Quarries, Bethel, Fairfield, Connecticut.  Ex. Thomas Fowler collection.  A large, mostly complete crystal which appears to be twinned.  It measures 6 x 3.6 x 3.3 cm overall.  No damage just matrix contacts.  An unusual New England find.  $950

 

 

 

 

 

 

OKI-409

OKI-409     Apophyllite on Prehnite     Southbury, Connecticut.  Ex. Anthony Dunn collection.  The specimen seen here is a floater, less one very thin area of contact.  The contact is right by my thumb in the second image.  5.2 x 4 x 3.1 cm.  Great miniature for this locality.  The snow white apophyllites are nice for luster and form.  A good east coast or New England piece.  $70

 

 

 

 

 

OKI-745

OKI-745   Chalcopyrite on Calcite and Quartz        Roncari Quarry (Tilcon Quarry), Granby, Hartford County, Connecticut.  Hematite stained and included calcites and quartz crystals make up this fine 9.4 x 5.2 x 4 cm piece.  This is basically one ling double terminated calcite of great complexity with a second calcite at one termination.  Several brassy chalcos to about 3 millimeters each.  Minor base contact, some minor healed surface area.  No damage.  The calcite is actually quite clear but the surface frosting and modifications make seeing into it difficult.  A few select faces are clear.  Fantastic example... fantastic quality, higher luster than the images indicate although most surfaces would be described as having a satin like luster, some are glassy.  $900

 

 

 

 

 

 

OKG-096

OKI-745   Calcite and Quartz        Roncari Quarry (Tilcon Quarry), Granby, Hartford County, Connecticut.  Beta form quartz crystals in small groups spread out over the entire surface of this specimen.  It measures 7.3 x 4.5 x 1.7.  The first generation quartz (and calcite) is yellow from hematite while the second generation, the larger clumps of crystals , are gray.  There is a rare butterfly twin lying on edge... seen in lower left of first image.  Zero damage.  An unusual specimen for this location.  $285

 

 

 

 

 

 

OKL-132

OKL-132    Fluorite, Cerussite, Sphalerite    Trumbull, Connecticut.  Ex. Thomas Fowler collection.  Two cubes a green and a blue on a matrix coated by tiny cerussites and sphalerite.  7 x 4.4 x 2.1 cm with each cube being approx. .9 cm on edge.  The green cube had one side growing against matrix.  All corners on blue cube are not fully formed, I do not believe they are damaged.  Even the non-exposed corners show this same development.  A really good quality specimen for the location.  $175 

 

 

 

 

 

 

OKL-739

OKL-739    Prehnite    O & G Quarry, Woodbury, Connecticut.   Ex. Thomas Fowler collection.  A nice example in a perky box.  High luster with a few scuffs.  4.5 x 3.5 x 1 cm.  $15

 

 

 

 

 

 

OKL-737

OKL-737    Tourmaline in Cleavlandite    Strickland Quarry, Collins Hill, Portland, Middlesex County, Connecticut.  Ex. Thomas Fowler collection.  The tourmaline crystal is a nice green color, well terminated, and rests between the blades of feldspar.  It is 2 cm long, undamaged and has a slight curve.  The cleavlandited are chipped to expose the tourmaline.  A nice example in a perky box.   $40

 

 

 

 

 

 

OKAA-044

OKAA-044    Calcite, Quartz, Hematite    Roncari Quarry, (Tilcon Quarry), East Granby, Hartford County, Connecticut.  This fine piece came from what was dubbed the "Halloween Pocket".  It measures 12 x 10 x 5.2 cm overall with calcites to 6.3 cm.  The largest calcite in the center of the specimen is double terminated.  Many small hematite halos on the calcites and some of the quartz.  The only damage is one calcite being cleaved and it is not distracting.  Nice contrasts, luster and interesting form to the calcites.  Mounted on a custom engraved acrylic base but the piece stands well on its own in the same position without aid.  $625

 

 

 

 

 

 

OKAA-045

OKAA-045    Calcite    Roncari Quarry, (Tilcon Quarry), East Granby, Hartford County, Connecticut.  This is composed of two twinned crystals but the real noteworthy one is the large, double terminated crystal making up the bulk of the specimen.  The piece measures 8 x 5 x 4.9 cm.  The crystals are on a thin crust of matrix and it sits nicely without assistance.  The crystal is mostly clear internally but with its satin finish it is difficult to reflect this in the images.  Views nicely from all sides.  Damage free.  Crystals of this type were uncommon from the location.   Mounted on a custom engraved acrylic base.  Excellent value.  $350

 

 

 

 

 

 

OKAA-046

Back

OKAA-046    Hematite on Quartz and Calcite    Roncari Quarry, (Tilcon Quarry), East Granby, Hartford County, Connecticut.    This is definitely what a museum grade specimen from Connecticut looks like.  I hand it is a thing of beauty measuring 16 x 12.2 x 7.5.  It stands upright on its own and is amazingly aesthetic.   The calcites are the most common for the find however they are unusually large (to over 8 cm each) and have the satin luster with hematite included areas, also common to the find.  At a quarry such as this one that blasts, to see a specimen of this size without any notable damage is a rarity.  There are a couple very tiny marks but you will need to break out a lope and search for them.  It displays as damage free from any view, and every view is nice.   Mounted on a custom engraved acrylic base.  This is a top New England specimen at a fraction of what specimens of this caliber normally sell for on today's mineral market.   Mounted on a custom engraved acrylic base.  $2,400

 

 

 

 

 

 

OKAA-047

OKAA-047      Quartz and Calcite    Roncari Quarry, (Tilcon Quarry), East Granby, Hartford County, Connecticut.  This specimen is a baseball size and shaped piece that is the end of a stalactitic growth.  The coating of calcite crystals is on all sides except the base and the quartz points coat the majority on one side.  It measures 8.5 x 8 x 6.5 cm.  There are two tiny missing quartz points and a couple cleaved calcite... all of which you will have to search for to find.  Excellent quality!  Mounted on a custom engraved acrylic base.  $400

 

 

 

 

 

 

OKAA-048

OKAA-048      Quartz and Calcite    Roncari Quarry, (Tilcon Quarry), East Granby, Hartford County, Connecticut.  Another pocupine like specimen with high luster and aesthetics... The coating of calcite crystals is on all sides except the base and the quartz points coat all of the front display face of the specimen.  It measures 11.5 x 9.4 x 7 cm.  There are two tiny missing quartz points with only one being visible to the eye and not at all distracting.  There is some rubbing tot he calcite on the back.  Again, excellent quality.  Mounted on a custom engraved acrylic base.  $550

 

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