mineral

Quartz (Milky/Crystal Variety)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to colorless; Luster: Vitreous; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Cloudy white to colorless
Luster: Vitreous

Identified May 15, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Cloudy white to colorless; Luster: Vitreous; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the crystallization of silica-rich magma or from hydrothermal veins. It is found in igneous, metamorphic, and sedimentary environments across all geological ages.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, construction as aggregate, and widely collected as mineral specimens or used in jewelry.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is known as rock crystal, while the milky appearance in this specimen is caused by tiny fluid inclusions trapped during growth.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. Commonly found in riverbeds, mountains, and mines globally. Look for the characteristic hexagonal prism shape in well-formed crystals.

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