mineral

Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white, transparent, or tinted with iron oxide patches; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white, transparent, or tinted with iron oxide patches
Luster: Vitreous to greasy

Identified August 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed in a wide variety of geological environments including igneous, metamorphic, and sedimentary rocks. Commonly crystallizes from silica-rich hydrothermal veins and pegmatites over millions of years.

Uses & applications

Used in glassmaking, electronics (quartz crystal oscillators), abrasive materials, gemstone carving, and mineral collecting.

Geological facts

Quartz is one of the most abundant minerals in Earth's continental crust. It exhibits piezoelectric properties, meaning it can generate an electrical charge in response to applied mechanical stress.

Field identification & locations

Identified in the field by its high hardness (scratches glass), conchoidal fracture, and lack of cleavage. Found worldwide in almost every geological setting.