mineral

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Translucent grey with white opaque streaks; Luster: Vitreous (glassy) to greasy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Translucent grey with white opaque streaks
Luster: Vitreous (glassy) to greasy

Identified July 12, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids fill fractures in surrounding rock. This specific specimen appears to be a water-worn river pebble or a tumbled piece showing internal fractures and milky quartz inclusions.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as a popular decorative stone for collectors and jewelry (cabochons).

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz', which had its origins in Slavic and West Bohemian dialects meaning 'hard'.

Field identification & locations

Can be identified in the field by its hardness (it will scratch glass) and lack of cleavage. Found globally in all rock types, especially near mountain ranges and riverbeds.