metamorphic
Quartz Vein in Host Rock
Hydrothermal Quartz (SiO2) in Slates/Schists
Hardness: 7 (Quartz) vs 3-5 (Host rock); Color: White to translucent vein in dark grey/brown/gold host; Luster: Vitreous (glassy) in vein; Structure: Crystalline vein within foliated matrix.
- Hardness
- 7 (Quartz) vs 3-5 (Host rock)
- Color
- White to translucent vein in dark grey/brown/gold host
- Luster
- Vitreous (glassy) in vein
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Physical properties
Hardness: 7 (Quartz) vs 3-5 (Host rock); Color: White to translucent vein in dark grey/brown/gold host; Luster: Vitreous (glassy) in vein; Structure: Crystalline vein within foliated matrix.
Formation & geological history
Formed via hydrothermal precipitation where hot, mineral-rich fluids fill fractures in host rock under high pressure and temperature. The host rock shows signs of shearing and folding, typical of regional metamorphism.
Uses & applications
Used primarily as decorative garden stones, road metal (if crushed), or as a source of quartz for industrial glass making. Occasionally indicates the presence of precious metals like gold in 'lode' deposits.
Geological facts
Many of the world's major gold strikes, such as those in the California Gold Rush, were found in white quartz veins like this one, known as 'mother lodes'.
Field identification & locations
Identify in the field by the stark contrast of a hard, white crystalline band cutting across darker, softer, layered rock. Common in mountainous regions with a history of tectonic activity.
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