metamorphic
Quartz Vein in Host Rock (Gneiss/Schist)
Silicon Dioxide (SiO2) within a metamorphic matrix
Hardness: 7 for the white quartz; Color: White vein with grey/brown matrix; Luster: Vitreous to greasy on the quartz; Crystal Structure: Hexagonal (trigonal); Cleavage: Conchoidal fracture; Specific Gravity: Approx 2.65 for the quartz.
- Hardness
- 7 for the white quartz
- Color
- White vein with grey/brown matrix
- Luster
- Vitreous to greasy on the quartz
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Physical properties
Hardness: 7 for the white quartz; Color: White vein with grey/brown matrix; Luster: Vitreous to greasy on the quartz; Crystal Structure: Hexagonal (trigonal); Cleavage: Conchoidal fracture; Specific Gravity: Approx 2.65 for the quartz.
Formation & geological history
Formed via hydrothermal activity where mineral-rich hot water circulated through cracks in the host rock during metamorphic events. Minerals precipitate out as the water cools or changes pressure.
Uses & applications
Primarily for geological study or amateur collecting; larger deposits of quartz are used in glassmaking, electronics (piezoelectricity), and as abrasives.
Geological facts
Quartz veins are often 'paths' that prospectors follow because they are frequently associated with gold and other precious metal mineralization in orogenic belts.
Field identification & locations
Identify in the field by the distinct color contrast and the hardness of the center band (it will scratch glass). Commonly found in mountain ranges and regions with a history of tectonic activity.
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