metamorphic
Quartz Vein in Metamorphic Rock
Quartz-veined Schist or Gneiss
AI-generated identification · may be incorrectHardness: 7 for quartz, 5-6 for host rock; Color: White/grey quartz with greenish-grey and reddish iron-stained host rock; Luster: Vitreous to dull; Crystal structure: Trigonal (quartz portion); Cleavage: None for quartz, variable for host rock; Specific gravity: ~2.65.
- Hardness
- 7 for quartz, 5-6 for host rock
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 for quartz, 5-6 for host rock; Color: White/grey quartz with greenish-grey and reddish iron-stained host rock; Luster: Vitreous to dull; Crystal structure: Trigonal (quartz portion); Cleavage: None for quartz, variable for host rock; Specific gravity: ~2.65.
Formation & geological history
Formed via hydrothermal activity where silica-rich fluids precipitated quartz into fractures within pre-existing metamorphic rock under high pressure and temperature conditions over millions of years.
Uses & applications
Used primarily as a geological specimen, lapidary study, and occasionally for decorative landscaping when tumbled.
Geological facts
Quartz veins are common pathways for hydrothermal ore deposition, frequently hosting gold and other valuable minerals.
Field identification & locations
Easily identified in the field by the stark contrast between the bright white quartz vein and the darker surrounding host rock, often found in mountainous or glaciated regions with active tectonic history.
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