mineral
Quartz with Tourmaline or Amphibole
Silicon Dioxide with silicate inclusions (SiO2)
Hardness of 7 on the Mohs scale, white and gray/black coloration, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65
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Physical properties
Hardness of 7 on the Mohs scale, white and gray/black coloration, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65
Formation & geological history
Formed in hydrothermal veins and pegmatites where silica-rich fluids cooled over millions of years, often later water-worn in riverbeds or beaches
Uses & applications
Used in lapidary arts, decorative objects, and crystal collecting
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust and exhibits piezoelectric properties
Field identification & locations
Easily identified by its high hardness (scratches glass), lack of cleavage, and characteristic water-worn smooth shape when found in alluvial deposits
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