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Mineral Specimens with Calcite
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24.7 x 16.1 x 7.3 cm. A large plate of gray limestone is encrusted with approximately 25 calcite crystals up to 10 cm across. Most are doubly-terminated and a few are twinned. They are very lustrous and many show great relief from the underlying rock matrix. The largest crystal has gemmy, cognac colored terminations with one end exhibiting multi-forked tips.
3.8 x 3.2 x 2.5 cm. This fine miniature features a sharp, deep green, 13 x 10 x 10 mm crystal perched nicely in contrasting matrix. It is not of gem rough caliber, but does have a lot of transparency and brightness and is certainly a worthy specimen. Ex. Jack Halpern Collection.
10.3 x 7.7 x 5.9 cm. This mineralogical oddball actually features 4.5 cm, orange-brown crystals of calcite (var. glendonite). Although these oddities are admittedly esoteric and hard to explain, visually they can be spectacular, like this one. Ex. Martin Zinn Collection.
2.2 x 1.4 x 1 cm. A very fine, sharp, deep green emerald crystal perched amongst contrasting calcite. The emerald is 8 mm tall and extremely well-terminated. This has very deep color especially for a smaller crystal (small ones are usually more pale).
7.3 x 7.1 x 3.3 cm. This beautiful, display-sized specimen features a totally gemmy 1-cm-long emerald perched dramatically out of sparkling crystallized calcite matrix. A beautiful matrix emerald, and hard to get with such nice calcite as well. In fact, this is good simply as a calcite specimen for the locality.
11.5 x 10.8 x 9.0 cm. A large and dramatic, complex specimen built up of iron-stained rhombohedral calcites with a pleasing reddish hue, perched atop an earlier generation of hematite-coated, matte-textured calcite of a different habit entirely (scalenohedral).
6.5 x 4.3 x 2.9 cm. Translucent, lustrous, blocky calcite rhombs form a fine specimen from recent finds at the Moscona Mine of Asturias, Spain. Highly representative of the species and locale.
10.5 x 9.7 x 6.8 cm. A striking, beautiful, 7.8 cm, doubly terminated calcite crystal is set on cabinet-sized chert matrix on this outstanding old-time specimen from the Picher Field of Oklahoma. The translucent, honey-brown crystal is pristine and has unusual, but very interesting, minute, en echelon, stepped-growth faces. Ex. Feist Collection, #2799.
10.3 x 8.8 x 5.3 cm. A dramatic and razor-sharp cityscape complex of honey-brown Calcite rhombohedra with excellent luster. Moreover, there are flashes of color iridescence, on the surface (micro-inclusions of oil, maybe?). Most of the edges are very gemmy, and there is but one contact point in one corner.
6.4 x 6.2 x 3.5 cm. An old-time, fine specimen of classic, light blue baryte prisms on sugary calcite from the Sterling Mine of Colorado. The water-clear, windowpane with nice beveled edges measures 1.7 x 1.4 cm. The large baryte crystal cluster is contacted. Baryte has been known from this classic Colorado locale since the 1870s and this specimen definitely predates major collecting efforts in the 1980s. Ex. Mullane Collection and probably dates from the 1950s to early 1970s. Very highly representative of the locality and rare for the era of collecting.
5.3 x 4.4 x 3.8 cm. A huge, sharp, classic willemite crystal aesthetically perched on a sliver of calcite with embedded franklinite crystals from Franklin. The moderately lustrous, rust-brown crystal has textbook, hexagonal form. Amazing green fluorescence on the willemite and orange for the calcite.
6.3 x 4.4 x 3.1 cm. A fine small cabinet size specimen featuring superb, sharp, gemmy, lustrous, prismatic, purple color "reverse" scepter crystals of Amethyst measuring up to 1.7 cm sitting atop grey modified rhombohedra of Calcite on matrix. This piece is remarkable for Bolivia as it features a type of crystallization that is virtually unheard of from any mine down there.
5.5 x 4.0 x 3.1 cm. The Prospect Park Quarry is one of the most impressive Zeolite localities in the world. This quarry has produced some amazing specimens in the last 100 years. This specimen features a few isolated, rare blue-grey crystal groups of Babingtonite (partially altered to some kind of Pyroxene) which are associated with pale golden Calcite rhombohedra on gem quality Quartz crystals on matrix. The Babingtonites from this locality are very distinctive, and certainly some of the most attractive for the species from the standpoint of the unusual color. Unfortunately, this great New Jersey locality is being filled in for a housing development (like so many of the great Trap Rock localities in this area), and pieces like this one will be never be collected again. Ex. Richard Kosnar Collection.
6.3 x 5.7 x 2.1 cm. Matrix specimens of Spinel are uncommon, but to find gem quality crystals on matrix is extremely difficult. This piece hosts a classic Burmese "Ruby Spinel" crystal measuring 6 mm and has very sharp, defined, lustrous, octahedral faces with a gemmy bright pinkish-red color. The crystal sits atop a matrix of massive white/grey Calcite as is typical for this locality. The piece is very showy and aesthetic for the material. This piece was mined around 2000, and is one of the finest Spinels from the Richard Kosnar Collection. This is an example of a non-pegmatite gem mineral for which many collectors probably do have a good specimen in their collections.
9.9 x 9.8 x 4.3 cm. This superb specimen consists of three Fluorite spheres (to 1.3 cm) and a 2-cm scalenohedron of Calcite, all perched on literally ropelike stalactites of translucent quartz crystals. Many of the quartz crystals actually comprise very attractive and visually delicate stalactites within the Chalcedony/basalt vug.
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Rob Lavinsky, rob@irocks.com
All Content and Design ©1996-2012 The Arkenstone
Mineral Specimens by species; or
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share specimen![Calcite from Elmwood mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith Co., Tennessee, USA [db_pics/mdpics/MD-270080a.jpg]](db_pics/mdpics/MD-270080a.jpg)
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![Beryl (Var: Emerald), Calcite from Coscuez Mine (Cosquez Mine), Muzo, Vasquez-Yacopí Mining District, Boyacá Department, Colombia [db_pics/mdpics/MD-270142a.jpg]](db_pics/mdpics/MD-270142a.jpg)
![Beryl (Var: Emerald), Calcite from Coscuez Mine (Cosquez Mine), Muzo, Vasquez-Yacopí Mining District, Boyacá Department, Colombia [db_pics/mdpics/MD-270142b.jpg]](db_pics/mdpics/MD-270142b.jpg)
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![Calcite from Moscona Mine, Solís, Llanera, Villabona mining area, Asturias, Spain [db_pics/mdpics/MD-270179a.jpg]](db_pics/mdpics/MD-270179a.jpg)
![Calcite from Picher Field, Tri-State District, Ottawa Co., Oklahoma, USA [db_pics/mdpics/MD-270180a.jpg]](db_pics/mdpics/MD-270180a.jpg)
![Calcite from Jalgaon District, Maharashtra, India [db_pics/mdpics/MD-270192a.jpg]](db_pics/mdpics/MD-270192a.jpg)
![Calcite from Jalgaon District, Maharashtra, India [db_pics/mdpics/MD-270192b.jpg]](db_pics/mdpics/MD-270192b.jpg)
![Baryte, Calcite from Sterling Mine, Stoneham, Weld Co., Colorado, USA [db_pics/mdpics/MD-270202a.jpg]](db_pics/mdpics/MD-270202a.jpg)
![Baryte, Calcite from Sterling Mine, Stoneham, Weld Co., Colorado, USA [db_pics/mdpics/MD-270202b.jpg]](db_pics/mdpics/MD-270202b.jpg)
![Willemite, Calcite, Franklinite from Franklin, Franklin Mining District, Sussex Co., New Jersey, USA [db_pics/mdpics/MD-270247a.jpg]](db_pics/mdpics/MD-270247a.jpg)
![Willemite, Calcite, Franklinite from Franklin, Franklin Mining District, Sussex Co., New Jersey, USA [db_pics/mdpics/MD-270247b.jpg]](db_pics/mdpics/MD-270247b.jpg)
![Quartz (Var: Amethyst), Calcite from Bombori, Chayanta Province, Potosí Department, Bolivia [db_pics/mdpics/MD-270298a.jpg]](db_pics/mdpics/MD-270298a.jpg)
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![Spinel, Calcite from Mogok, Sagaing District, Mandalay Division, Burma (Myanmar) [db_pics/mdpics/MD-270337a.jpg]](db_pics/mdpics/MD-270337a.jpg)
![Spinel, Calcite from Mogok, Sagaing District, Mandalay Division, Burma (Myanmar) [db_pics/mdpics/MD-270337b.jpg]](db_pics/mdpics/MD-270337b.jpg)
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