metamorphic
Quartz Vein in Siltstone
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
Hardness: 7 (Quartz), 3-4 (Matrix); Color: White, cream, and pinkish-brown; Luster: Vitreous to dull; Crystal structure: Trigonal/Amorphous; Cleavage: None/Conchoidal fracture
- Hardness
- 7 (Quartz), 3-4 (Matrix)
- Color
- White, cream, and pinkish-brown
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (Quartz), 3-4 (Matrix); Color: White, cream, and pinkish-brown; Luster: Vitreous to dull; Crystal structure: Trigonal/Amorphous; Cleavage: None/Conchoidal fracture
Formation & geological history
Formed through hydrothermal processes where mineral-rich hot water circulated through fractures in existing rock (likely siltstone or argillite) during tectonic activity. The host rock is often Paleozoic or Mesozoic in age.
Uses & applications
Quartz is used in glassmaking, electronics, and as an abrasive. Specimens like this are primarily of interest to amateur geologists and collectors.
Geological facts
Quartz veins often act as 'hosts' for precious metals like gold. The presence of such heavy veining indicates significant past hydrothermal activity in the area.
Field identification & locations
Identify by the white, crystalline material cutting across the layers or mass of the darker host rock. Quartz will easily scratch glass while the surrounding siltstone will not. Common in mountainous or formerly volcanic regions.
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