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Mineral Specimens with Calcite
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2.4 x 0.9 x 0.7 cm (largest). A fine, 6-piece set of calcite scalenohedrons from a rare 1980s find in Lake Superior off of the famed Keweenaw Peninsula of Michigan. All of the crystals are water-clear, unusually flattened and have steep, modified terminations. All of the crystals are beautifully striated and all are pristine. Ex. Dick Jones Collection.
9.4 x 8.3 x 6.3 cm. A striking, large and sharp, 6.5 x 4.1 cm, color-zoned, pokerchip calcite crystal is very aesthetically set amongst smaller crystals in this fine specimen from the mines at Charcas, Mexico. The center of the glassy, sharp-faced crystal is water-clear and colorless, while the outer layers are milky-white. This crystal is pristine. A couple of the smaller crystals are cleaved but the main core is complete and striking, with unusually robust crystals. Ex. Evan Jones Mexico Collection.
7.8 x 5.8 x 4.8 cm. A classic, well-displayed calcite from the Thomasville Crushed Stone Quarry of Pennsylvania. The striking, 7.0 cm, translucent and lustrous, golden-amber crystal is doubly terminated and twinned and rests very nicely on the box-work limestone matrix. The crystal faces are very sharp and lightly striated. Excellent quality Thomasville material from the George Feist Collection # 1987.
6 x 4.5 x 3.6 cm. This specimen features a geode vug with colorless, lustrous calcite crystals hosting a diverging spray of lustrous, brassy millerite crystals to an inch in length. Note that the millerite from here is more cylindrical and stout in form, compared to the hairy wires from Kentucky. This is as large a specimen as I have seen for the locality on the market in some time. I had the good fortune to find it in a French collection a month ago, and repatriated it. An aesthetic and impressive millerite. These came out in the 1960s from a small locality in the middle of a city park, and it is not possible to collect there any more. Specimens of this quality are very scarce.
3.3 x 2.7 x 2.3 cm. A fine specimen with gem crystals, on matrix, from a surprising and small find of late 2005. These are the best seen in 20 years, of this rare gem species related to ettringite and sturmanite. This piece features a great balance with gemmy calcites overlooking the matrix loaded with thaumasites. And, they happen to be beautiful. In person, there is more lustre.
2.0 x 1.5 x 1.4 cm. A fine specimen with gem crystals, on matrix, from a surprising and small find of late 2005. These are the best seen in 20 years, of this rare gem species related to ettringite and sturmanite. And, they happen to be beautiful. In person, there is more lustre.
10.5 x 10.5 x 4 cm. This is an Elmwood specimen from the famous late 1970s "jewel pocket", that was recently traded to me out of the collection of the Benjamins, friends in France known for their exquisite taste in fluorite and calcite in particular. It was formerly owned by Keith Proctor, who obtained it from the Steve Neely Collection, which was sold in 1997. This pocket remains one of the most famous and desired of all Elmwood calcite finds, and the gemmy quality, sparkling lustre, and sheer transparency of the crystals sets a standard hard to beat. I think it’s pretty obvious why they nicknamed it, that. Most crystals were 1-2 inches. Some few in good condition reached 4-6 inches. Most have damage. This one does not. Most specimens from this pocket consist of a single isolated crystal sitting flat on shards of gray dolomite, which detracts from the light transmission through the crystals, and means that too much ugly gray rock is often present. Not this one. In this piece, the calcite itself is central, and a few shards of the matrix extend elegantly from the calcite and behind it in a way that enhances the calcite by immediately conveying how gemmy it is. It is gem clear throughout. You are looking right through the whole crystal in the photo, in its core over 3 cm thick, to the extension of matrix on its backside which reaches out to host the accessory crystal. The real prize, though, is that this piece has a secondary crystal which is even gemmier than the first, just a perfect gem hanging off the extended matrix. The large crystal has very sharp terminations, and the smaller one has the rarer, fat termination with multiple facets. So you have two slightly different styles on the same specimen, complementing. Ex. Francis and Patricia Benjamin, Keith Proctor, and Steve Neely Collections.
5.5 x 4.5 x 3.5 cm. A very old, very rare calcite crystal with sparkly, powder-blue copper mineral inclusions from the Mid-Continent Mine of Kansas. The sharply terminated, lustrous, translucent, amber crystal scalenohedron aesthetically rests on sphalerite with chalcopyrite. The copper mineralization, as malachite or chrysocolla, formed as the chalcopyrite weathered and as the calcite crystal was growing. This is a unique, rare old-time specimen, certainly from prior to World War I. Ex. Mullane Collection.
14.5 x 7 x 12 cm. Two parallel-growth calcite scalenohedrons exhibit glassy luster with gemmy terminations. The color is a rich golden amber and at the base of the crystals it is clearly evident that there were three distinct generations of calcite formation when you look up from underneath. This is part of what gives such a rich hue. Weighs 1200 grams. This mine is now closed.
9 x 8 x 5.5 cm. This matrix specimen is characterized by two distinct fluorite colorations meeting along a diagonal in the middle. The lower color zone is a 2 cm wide band of glassy and gemmy, pastel-green crystals which reach 1.5 cm across. The upper/top generation is composed of glassy and gemmy dark green-gray crystals to 1.0 cm across. On this later occurrence are colorless crystals of calcite, to .2 cm across. Fascinating combination of colors, somewhat more obviously so in person.
12.5 x 9 x 6.5 cm. In appearance, these "poker chip" calcite crystals closely resemble the famous Charcas, Mexico, specimens of decades ago. Yet they are from a recent, new find in China of the last few years. Emplaced on matrix is a cluster of these waxy, white, modified rhombs of calcites measuring up to 7.5 cm across.
11.5 x 11 x 2.5 cm. Covering matrix which is an earlier generation of calcite, several "calcite roses" or rosettes stand up 3-dimensionally and contrast. They are extremely lustrous and translucent; and of a rich ivory color. The largest of these clusters measures 5.0 cm across. Nearly pristine. Very classic, large example of this habit.
8 x 5.5 x 4 cm. Emplaced on matrix is a plate of glassy and gemmy, light lavender colored fluorite cubes, to 1.5 cm across. Associated sprays of doubly terminated, white calcite, to 2.5 cm in length add color contrast and sharpness around the periphery. The large fluorite crystal in the center of the specimen has at least three inclusions of pyrite. This is classic and rare fluorite, for lustre and color and the calcite association, for this locality. Often it is confused with more common Naica material but they look subtly different.
9.5 x 6.7 x 4.0 cm. A classic golden scalenohedral Calcite crystal with sharp, lustrous faces and great form. The crystal sits on a matrix of white/grey Dolomite with Pyrite and iridescent Chalcopyrite. Not nearly as common on the market as they once were, and easily some of the most well known American Calcite specimens extant.
9.3 x 6.1 x 4.8 cm. This fine amethyst specimen from the La Sirena Mine at Guanajuato, Mexico is distinctively different, than most you see from any other locality. There are actually three generations of quartz on this piece, which is nicely accented with two small clusters of milky calcite rhombs. The pretty purple amethyst crystals are sheathed in lustrous, frosted quartz on the sides of the crysals. The sharp, amethyst terminations are composed of water-clear, colorless quartz. Looking down onto the crystals gives a surreal phantom-like look, with the amethyst inside of the frosted quartz sides. Uncommonly fine material from this famous locale. Ex. Consie Prince Collection.
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Rob Lavinsky, rob@irocks.com
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share specimen![Calcite from Lake Superior, Keweenaw Co., Michigan, USA [db_pics/mdpics/MD-260150a.jpg]](db_pics/mdpics/MD-260150a.jpg)
![Calcite from Lake Superior, Keweenaw Co., Michigan, USA [db_pics/mdpics/MD-260150b.jpg]](db_pics/mdpics/MD-260150b.jpg)
![Calcite from Lake Superior, Keweenaw Co., Michigan, USA [db_pics/mdpics/MD-260150c.jpg]](db_pics/mdpics/MD-260150c.jpg)
![Calcite from Charcas, Mun. de Charcas, San Luis Potosí, Mexico [db_pics/mdpics/MD-260153a.jpg]](db_pics/mdpics/MD-260153a.jpg)
![Calcite from Charcas, Mun. de Charcas, San Luis Potosí, Mexico [db_pics/mdpics/MD-260153b.jpg]](db_pics/mdpics/MD-260153b.jpg)
![Calcite from Thomasville Crushed Stone Quarry, Thomasville, Jackson Township, York Co., Pennsylvania, USA [db_pics/mdpics/MD-260156a.jpg]](db_pics/mdpics/MD-260156a.jpg)
![Millerite, Calcite from Estabrook Park (Berthlet; North Milwaukee; Cementville; Lincoln Park; Capitol Drive; Washington Street Bridge; Humbolt Street Bridge), Milwaukee, Milwaukee Co., Wisconsin, USA [db_pics/mdpics/MD-260437a.jpg]](db_pics/mdpics/MD-260437a.jpg)
![Thaumasite, Calcite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-260447a.jpg]](db_pics/mdpics/MD-260447a.jpg)
![Thaumasite, Calcite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-260450a.jpg]](db_pics/mdpics/MD-260450a.jpg)
![Thaumasite, Calcite from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-260450b.jpg]](db_pics/mdpics/MD-260450b.jpg)
![Calcite from Elmwood mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith Co., Tennessee, USA [db_pics/mdpics/MD-260464a.jpg]](db_pics/mdpics/MD-260464a.jpg)
![Calcite, Sphalerite, Chalcopyrite from Mid-Continent Mine, Treece, Picher Field, Tri-State District, Cherokee Co., Kansas, USA [db_pics/mdpics/MD-261472a.jpg]](db_pics/mdpics/MD-261472a.jpg)
![Calcite from Elmwood mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith Co., Tennessee, USA [db_pics/mdpics/MD-261491a.jpg]](db_pics/mdpics/MD-261491a.jpg)
![Fluorite, Calcite from Xianghualing Mine (Hsianghualing Mine), Xianghualing Sn-polymetallic ore field, Linwu Co., Chenzhou Prefecture, Hunan Province, China [db_pics/mdpics/MD-261498a.jpg]](db_pics/mdpics/MD-261498a.jpg)
![Calcite from Dongpo ore field, Yizhang Co., Chenzhou Prefecture, Hunan Province, China [db_pics/mdpics/MD-261581a.jpg]](db_pics/mdpics/MD-261581a.jpg)
![Calcite from Turt Mine (Ghezuri Mine), Turt, Satu Mare, Maramures Co., Romania [db_pics/mdpics/MD-261582a.jpg]](db_pics/mdpics/MD-261582a.jpg)
![Fluorite, Calcite from San Martín Mine, San Martín, Mun. de Sombrerete, Zacatecas, Mexico [db_pics/mdpics/MD-261584a.jpg]](db_pics/mdpics/MD-261584a.jpg)
![Calcite, Dolomite, Pyrite, Chalcopyrite from Sweetwater Mine (Milliken Mine; Frank R. Milliken; Blair Creek; Ozark Lead Company Mine; Adair Creek; Logan Creek), Ellington, Viburnum Trend District, Reynolds Co., Missouri, USA [db_pics/mdpics/MD-261617a.jpg]](db_pics/mdpics/MD-261617a.jpg)
![Quartz (Var: Amethyst), Calcite from La Sirena Mine, Guanajuato, Mun. de Guanajuato, Guanajuato, Mexico [db_pics/mdpics/MD-261702a.jpg]](db_pics/mdpics/MD-261702a.jpg)
![Quartz (Var: Amethyst), Calcite from La Sirena Mine, Guanajuato, Mun. de Guanajuato, Guanajuato, Mexico [db_pics/mdpics/MD-261702b.jpg]](db_pics/mdpics/MD-261702b.jpg)