5.2" Sparkly Druzy Quartz Encrusted Calcite Crystals - India

This is a gorgeou, 5.2" wide cluster of calcite crystals that are encrusted in a layer of sparkling druzy quartz, collected from Maharashtra, India. A large calcite crystal without quartz can be found along one edge of the specimen, along with a pocket that reveals more of the smaller calcite crystals.

The base of this specimen has been cut flat, allowing for aesthetic presentation without the need for a display stand.

Silicon Dioxide, also known as SiO2 or Quartz, is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich, hot watery solutions called hydrothermal environments, at temperatures between 100°C and 450°C, and usually under very high pressure. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountains forming, and can be hundreds of millions of years old.

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 & Calcite
Maharashtra, India
5.2 x 3.9"