mineral

Quartz on Matrix

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale. Color: Transparent to translucent white. Luster: Vitreous (glassy). Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Hardness: 7 on the Mohs scale
Color: Transparent to translucent white
Luster: Vitreous (glassy)

Identified June 29, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids cool in crustal fractures. These specimens are found globally in igneous, metamorphic, and sedimentary environments, ranging from precambrian to recent geological ages.

Uses & applications

Widely used in glassmaking, electronics (piezoelectric properties), abrasives, and as a popular collector's mineral. High-quality crystals are used in jewelry and gemstone carving.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to both chemical and physical weathering. Famous localities include Arkansas, USA and Minas Gerais, Brazil.

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage. Look for the vitreous luster and crystal faces. Common in mountain ranges and riverbeds worldwide. Use a streak plate (white streak) for confirmation.