Combination of Calcite, Quartz and Chalcopyrite

Amazing combination of Calcite, Quartz and Chalcopyrite
Amazing combination of Calcite, Quartz and Chalcopyrite. Credit: Anton Watzl

Amazing combination of Calcite, Quartz and Chalcopyrite

Calcite | #Geology
Calcite is the one of the most common minerals. Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate. It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison.
Formula: CaCO₃
System: Trigonal
Colour: White, Yellow, Red, ...
Lustre: Vitreous, Pearly
Hardness: 3

Quartz is the second most abundant mineral in Earth's crust after feldspar.  Quartz is a hard, crystalline mineral composed of silica. The atoms are linked in a continuous framework of SiO₄ silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO₂. It occurs in basically all mineral environments, and is the important constituent of many rocks.
Formula: SiO₂
System: Trigonal
Hardness: 7

Chalcopyrite is a copper iron sulfide mineral and the most abundant copper ore mineral. It has the chemical formula CuFeS₂ and crystallizes in the tetragonal system. It has a brassy to golden yellow color and a hardness of 3.5 to 4 on the Mohs scale. Its streak is diagnostic as green-tinged black.
Formula: CuFeS₂
System: Tetragonal
Hardness:  3.5 to 4

The specimen in the photo is From: Boldut Mine, Cavnic, Maramures Co., Romania
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