TWINNED TABULAR CALCITE
A striking specimen of Twinned Tabular Calcite Crystals. Two crystals Twinned stand pert atop a heavy rock matrix. This is rarer form of calcite from a mine that produces some very cool stuff. A great addition for your calcite or mineral collection.
Mine No. 884 Mine, Chenzhou, Hunan, China.
9cm x 4.7cm x 7cm, 216g.
Main crystal, 4.6cm.
CaCO3, Calcium Carbonate.
Calcite, which gets its name from “chalix” the Greek word for lime, is a most amazing and yet, most common mineral. It is one of the most common minerals on the face of the Earth, comprising about 4% by weight of the Earth’s crust and is formed in many different geological environments. Calcite can form rocks of considerable mass and constitutes a significant part of all three major rock classification types. It forms oolitic, fossiliferous and massive limestones in sedimentary environments and even serves as the cements for many sandstones and shales. Interestingly Limestone becomes marble from the heat and pressure of metamorphic events. The crystals of calcite can form many different shapes. The positive rhombohedron, negative rhombohedron, steeply, moderately and slightly inclined rhombohedrons, various scalahedrons, prism and pinacoid.