metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in Slate/Schist
Hardness: 7 (quartz), 3-5 (host rock); Color: White, milky, dark grey; Luster: Vitreous (glassy) to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Indistinct; Specific gravity: ~2.65
- Hardness
- 7 (quartz), 3-5 (host rock)
- Color
- White, milky, dark grey
- Luster
- Vitreous (glassy) to dull
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Physical properties
Hardness: 7 (quartz), 3-5 (host rock); Color: White, milky, dark grey; Luster: Vitreous (glassy) to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Indistinct; Specific gravity: ~2.65
Formation & geological history
Formed when hydrothermal fluids rich in silica are injected into fractures of a darker host rock under high pressure and temperature, often during tectonic events (mountain building). Geological age varies by region.
Uses & applications
Used primarily as decorative river stones, for metaphysical collection, or as indicators for gold prospecting in larger outcrop systems.
Geological facts
Quartz veins are the most common source of primary gold deposits. This specific specimen has been water-worn into a pebble, likely found in a riverbed or on a beach.
Field identification & locations
Identify by the sharp contrast between the white crystalline quartz and the darker, finer-grained host rock. It can be found in mountain streams, glacial till, and coastal beaches globally.
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