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This listing is for your choice of the very bright orange Calcite crystal specimens from Mexico pictured. You will receive the actual specimen you select. These extra large polished (acid washed) crystals are very colorful and would make a great addition to your collection on your mantle or shelf or for a gift for a loved one or rockhound.Measurements:
1: 7.5x4x3" - 2.6 Lbs.
2: 6x5x4" - 2.7 Lbs.
4: 5x4x4" - 3 Lbs.
6: 8x3x2" - 2 Lbs.
7: 7x5x4" - 3.6 Lbs.
9: 6x5x3" - 4.4 Lbs.
11: 7x6x4" - 3.8 Lbs.
13: 4x4x2" - 1.2 Lbs.
16: 6.5x2x2" - .9 Lbs.
17: 6x5x4" - 3.3 Lbs.
Link to Our Other Crystal and Mineral Specimens
CALCITE PROPERTIES: Calcite is a common constituent of sedimentary rocks, limestone in particular, much of which is formed from the shells of dead marine organisms. It also occurs as a vein mineral in deposits from hot springs, and it occurs in caverns as stalactites and stalagmites. Calcite may also be found in volcanic or mantle-derived rocks such as carbonatites, kimberlites, or rarely in peridotites. High-grade optical calcite was used in World War II for gun sights, specifically in bomb sights and anti-aircraft weaponry. Also, experiments have been conducted to use calcite for a cloak of invisibility. Category - Carbonate mineral.
Formula - CaCO3.
Color - Colorless or white, also gray, yellow, green,
Crystal habit - Crystalline, granular, stalactitic, concretionary, massive, rhombohedral.
Crystal system - Trigonal hexagonal scalenohedral.
Twinning - Common by four twin laws.
Cleavage - Perfect on three directions.
Fracture - Conchoidal.
Tenacity - Brittle.
Hardness - 3 (defining mineral).
Luster - Vitreous to pearly on cleavage surfaces.
Streak - White.
Specific gravity - 2.71.
Other characteristics - May fluoresce red, blue, yellow, and other colors under either SW and LW UV; phosphorescent.
Courtesy of Wikipedia
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