mineral

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent orange (iron-stained); Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent orange (iron-stained)
Luster: Vitreous (glassy)

Identified April 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids permeate cracks in a host rock (likely granite or schist). As the fluids cool, quartz crystallizes. These can form across all geological ages, often in metamorphic or igneous environments.

Uses & applications

Used primarily as rough specimens for collectors, decorative landscaping, and occasionally crushed for industrial silica or used in lapidary for cabochons if the quality is high.

Geological facts

Quartz veins are often the primary indicators for gold prospectors, as gold is frequently found associated with hydrothermal quartz deposits. The orange/yellow staining in this specimen is caused by the oxidation of iron minerals (limonite/hematite).

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage (it breaks into irregular, sharp shards). Can be found globally in moutainous or rocky terrains. Look for milky white bands cutting through darker, duller base rocks.