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Mineral Specimens with Diamond
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22.9 x 21.1 x 12.5 cm. An incredible piece with huge crystals, complete and nearly pristine all around, forming one of the largest Herkimer Diamond clusters I have ever seen in 20 years, museum or otherwise. There are such thick, solid junctions that I am pretty sure we have only 1 or 2 repairs here at natural contacts, whereas normally every crystal in a cluster might have to be repaired back together. The signature piece from a collection built over about 40 years, this is a huge specimen.
7.9 x 7.2 x 3.8 cm. A very rare matrix specimen of Quartz from Herkimer, perched atop calcite crystals. The quartz measures 5 cm across and floats up there, complete-all-around. And it’s undamaged. It is also not repaired, as most matrix specimens are. And most of those are just quartz on gray rock. I grew up in the Midwest and collected here as a kid, and I can assure you that one does not routinely see a Herkimer-type specimen like this.
A lustrous, gray-green 1.16 carat diamond crystal from Sierra Leone, Africa with VERY, VERY unusual morphology. The crystal shows cube, dodecahedral and octahedral faces. 0.5 x 0.5 x 0.5 cm
0.5 x 0.4 x 0.4 cm. A sharp, very lustrous diamond crystal from the classic locality here, a river whose diamond-bearing sands lent its name to the place. This is unusually sharp and equant for the locality as most are flattish. Also, it has a pleasant brown color whereas most are gray to white. Lastly, note the fine adamantine lustre, a characteristic of this locality. Weight is 0.66 carats.
4.8 x 3.4 x 2.6 cm. A glassy, gem-like Herkimer Diamond quartz scepter very nicely accented with a shard of matrix and a smaller crystal from the famous deposits at Middleville, New York. The internal crazing really adds character to the complete-all-around "diamond" and the quartz stalk is also terminated, thus this is a doubly terminated specimen. Ex. Daniel Trinchillo Sr. Collection.
7.6 x 5.4 x 4.8 cm. A rare Brazilian specimen of a gemmy, glassy and lightly frosted, 4 mm, triangular diamond crystal nestled amongst conglomerate river pebbles and cobbles from the Diamantina River of Minas Gerais. These alluvial diamonds, deposited into conglomerates over time, are the reason this region of Brazil was named after an old-time diamond rush. Seldom are such specimens preserved. This one, amazingly, has very prominent pebbles and cobbles on both sides. The diamond rests on a 5.3 cm flat cobble. These came out of Brazil 40-50 years ago.
0.5 x 0.5 x 0.5 cm. A lustrous, gemmy, 0.96 carat, transparent to included, rounded, nubby, brown diamond from Crater of Diamonds State Park, Arkansas. The crystal was found by Robert and Anna Ford in July, 2009 and is accompanied by a Park card.
1.5 x 1.5 x 0.4 cm. This rare twinned diamond crystal is not only stunning, but is also rather thick at 4.2 mm in thickness, to have such clarity. It is twinned in a formation called "macle twinning", more common in spinels and quite rare in other gem species. The result is that instead of looking octahedral, it looks like a sharp triangle. It is exceptionally clean throughout, with only a few extremely slight carbon inclusions; and you could call it gemmy and literally mean "gemmy" when you say it. The triangular form is unusually equant for a stone of this size, and it "looks" naturally cut. In fact, a recent vogue in jewelry is to wear such natural diamonds in fancy settings, without cutting and faceting them. This could be one such showpiece, if mounted in a setting. It certainly is the biggest diamond of any quality that I have seen for available on the open market as a specimen in the 3 years or so since I last had one of these crystals. The specimen is 9.94 carats.
A stunning, bright yellow diamond crystal composed of penetration- twinned cubes intergrowing with each other. The overall effect is striking. It is complete all around. Old specimen ex. Gilbert Gauthier stock (which is where the unusually good locality data came from) 1.5 x 1.3 x 1.1 cm (25.2 carats)
6.9 x 5.4 x 3.4 cm. A striking, gem-like, “Herkimer Diamond” quartz crystal cluster from the famous deposits at Middleville, New York. The large crystal is doubly terminated, as are several of the smaller "diamonds". The termination of the large crystal is razor sharp and is complete-all-around. The internal crazing and clay inclusions really add character to this aesthetic specimen. Ex. Daniel Trinchillo Sr. Collection.
5.9 x 4.8 x 3.5 cm. Matrix “Herkimer Diamond” quartz specimens are rare because the crystals commonly break off matrix during collecting, as the matrix is usually very hard. The sculptural, mounded matrix on this fine specimen is covered with a multitude of small, glassy, transparent smoky quartz crystals. Water-clear, gem-like quartz "diamond" crystals strikingly dominate the specimen. The large crystal is 1.4 cm. Nearly pristine. This is a rare, visually impressive, complete-all-around, matrix Herkimer diamond specimen from this renowned New York locale. Ex. Daniel Trinchillo Sr. Collection.
6.0 x 4.4 x 3.8 cm. A striking, gem-like “Herkimer Diamond” quartz crystal from the famous deposits at Middleville, New York. The water-clear crystal is doubly terminated and looks like it was faceted. Ex. Daniel Trinchillo Sr. Collection.
0.4 x 0.2 x 0.2 cm. A lustrous, gemmy, 0.09 carat, transparent, oval, octahedral, white diamond from Crater of Diamonds State Park, Arkansas. The crystal was found by Richard Cooper in February, 1997 and comes with a Park card. A highly representative diamond from this well-known US locale.
A really sharp cluster of these gorgeous, naturally-faceted quartz crystals! Complete all around! 2.6 x 2.5 x 1.2 cm
This is a "rare brazilian ballas" according to the diamond trade - this is a fascinating SPHERICAL diamond with no crystal form, measuring 6mm in diameter and with a smooth surface like a pearl. It is entirely translucent. Ballas are almost impossible to cut because even other diamonds have serious trouble cutting them. (3.75 carats)
This Photo was Mindat.org Photo of the Day - 6th Jun 2006
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Rob Lavinsky, rob@irocks.com
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share specimen![Quartz (Var: Herkimer Diamond) from Ace of Diamonds Mine, Middleville, Town of Newport, Herkimer Co., New York, USA [db_pics/mdpics/MD-260462a.jpg]](db_pics/mdpics/MD-260462a.jpg)
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