Calcite in Fossil Clam
Rucks Pit, Fort Drum, Okeechobee
9.4 x 8.8 x 5.7 (cabinet)
Pre Holiday 2017
A far better than average specimen of the remarkable Calcite in Clam shell fossil from the renowned Rucks pit. This was once a prolific small quarry and produced many of the Miocence age fossil Clams. Now closed to collecting and reportedly exhausted, this was a unique deposit. This example is a perfectly complete shell, well defined and showing the Clam exterior replaced by tiny Calcite crystals. The inner void is seen through an opening at the hinge and shows well formed gemmy amber color Calcite prisms to 3.1 CM long lining the inside. These were plentiful in the past, but fine, perfect examples like this were never common and are now especially desirable and rare.
This is a choice Shullsburg Calcite with the classic stepped Scalenenohedral crystals that have enlarged clear prismatic terminations. Far more transparent in person this has glassy luster and faint phantoms of internal Pyrite crystals. In excellent condition the only damage is the base and back lower edge area where this was removed. A choice older specimen, these are modern classics and this is like a textbook example of epitaxial alignment of prism faces.
Colorful and with a flowerlike form, this is an excellent Calcite from the famed Cavnic mine of Romania. Sharp scalenohedral crystals radiating in a spherical mass have been coated with small Pyrite crystals and have internal coloring perhaps from Hematite. The back of the mass is broken where it was removed but the front display side is quite fine and undamaged. Lots of impact and far better in person.
A delicate specimen in excellent condition with very pale pink (mangano) Calcites on a matrix of needle Quartz, lustrous Sphalerites and Pyrite. An attractive and nicely composed specimen from the great Madan deposits of Bulgaria. To my taste the Sulfide deposits of this region have produced the most esthetic examples of many species. This is a small but striking piece with quite remarkable slender Quartz that are decorated with tiny crystals of Sphalerite as well.
Mine 884, Leiping, Guiyang County, Chenzoh Prefecture
3.6 x 2.5 x 2.1 CM (small miniature/ large thumbnail (toenail))
A perfect toenail of incredible gem clear Calcite from the finds in 2000 in Leiping. This find was huge news in the mineral world because the Calcites were so much like the prized 18-19th century British specimens. This find too has been finished and these are already modern classics. Far better than the photos show - top luster, glass clear transparency and textbook perfect form. A tiny bit of Hematite is noted on the matrix.
Calcite - classic British
Bigrigg mine, West Cumberland Iron field
3.1 x 1.7 x 1.6 CM (small miniature/ large thumbnail (toenail))
A clear sharp single scalenohedron from the famed Bigrigg Mine. From an older European collection this is at least 80 years old but likely much older. There is a number attached that could be removed if desired. Quite clean by naked eye but some contacts and rough bits found with magnification, all under 1mm. Not perfect but looks it, and not expensive as is often the case with these old finds.
An exceptional specimen the most perfect, colorful and gemmy Calcite I have seen from the closed Rucks Pit fossil clam locality. From early finds at this now classic location, an ex Arkenstone specimen, the luster and transparency are hard to capture in a photo. A small amount of the original clam shell fossil forms the base of this piece, the crystals had grown inside the clam but are now exposed. Unlike most of the thousands of specimens from here this is in the top .001 percent!
Calcite on Quartz (Amethyst)
Mina Peregrina, Guanajuato
8.4 x 6.4 x 4.1 CM (cabinet)
Bright glassy clear crystals of light pink-violet Calcite perched on a contrasting Amethyst matrix. Classic material from Guanajuato, this is quite eye-catching. In excellent condition, there is a single clean repair that is super hard to find, that needs to be mentioned. This keeps the price low yet this displays like it cost far more.