4.7" Scepter Quartz and Calcite Crystal Association - Cocineras Mine

This is a gorgeous association of quartz scepters and calcite crystals that was collected from the Cocineras Mine in Chihuahua, Mexico. Many of the quartz crystals have red coloration around their terminations. This can be attributed to the presence of iron oxidation (hematite).

Comes with an acrylic display stand to assist with presenation.

Calcite, CaCO3, is a carbonate mineral and the most stable polymorph of calcium carbonate. The other polymorphs are the minerals aragonite and vaterite. Calcite crystals are trigonal-rhombohedral, though actual calcite rhombohedra are rare as natural crystals. However, they show a remarkable variety of habits including acute to obtuse rhombohedra, tabular forms, and prisms. Calcite exhibits several twinning types adding to the variety of observed forms. It may occur as fibrous, granular, lamellar, or compact. Cleavage is usually in three directions parallel to the rhombohedron form.

Quartz is the name given to silicon dioxide (SiO2) and is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich environments--usually igneous rocks or hydrothermal environments like geothermal waters--at temperatures between 100°C and 450°C, and usually under very high pressure. In either case, crystals will precipitate as temperatures cool, just as ice gradually forms when water freezes. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountain formation: these veins can be hundreds of millions of years old.

Quartz & Calcite
Cocineras Mine, Santa Eulalia Distract, Chihuahua, Mexico
4.7 x 2.6"