mineral

Quartz (Chatoyant or Milky variety)

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Milky white to translucent tan
Luster: Vitreous to greasy

Identified April 8, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. This specimen likely originated in a hydrothermal vein environment where the mineral crystallized from hot, mineral-rich water solutions.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as a semi-precious gemstone in jewelry or for decorative lapidary purposes.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz' and the Polish dialect term 'kwardy', meaning hard.

Field identification & locations

Identify in the field by its ability to scratch glass and its lack of cleavage (it breaks with smooth, curved surfaces). It is found globally in almost all geological environments.

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