igneous/metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Matrix
Hardness: 7 (quartz components); Color: White, tan, and brown; Luster: Vitreous to dull; Crystal structure: Trigonal (hexagonal); Cleavage: None/Conchoidal fracture; Specific gravity: ~2.65
- Hardness
- 7 (quartz components)
- Color
- White, tan, and brown
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (quartz components); Color: White, tan, and brown; Luster: Vitreous to dull; Crystal structure: Trigonal (hexagonal); Cleavage: None/Conchoidal fracture; Specific gravity: ~2.65
Formation & geological history
Formed through hydrothermal processes where silica-rich fluids permeate cracks in existing rock (the brown matrix) and crystallize over time, often during mountain-building events or volcanic activity.
Uses & applications
Used primarily as decorative garden stone, geological teaching specimens, or for extracting high-purity silica for industrial use if found in large enough deposits.
Geological facts
Quartz veins are often the primary source of 'lode gold,' as gold particles frequently deposit in the same hydrothermal fractures as the quartz.
Field identification & locations
Identify in the field by looking for white, glassy bands or inclusions within darker, duller rock. Quartz will easily scratch glass and will not react with acid (unlike calcite).
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