metamorphic
Quartz Vein in Gneiss or Schist
Silicon dioxide (SiO2) within metamorphic host rock
Hardness: 7 (Quartz); Color: Milky white to translucent, grey and tan host; Luster: Vitreous to dull; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
- Hardness
- 7 (Quartz)
- Color
- Milky white to translucent, grey and tan host
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (Quartz); Color: Milky white to translucent, grey and tan host; Luster: Vitreous to dull; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
Formation & geological history
Formed through hydrothermal processes where silica-rich fluids filled fractures in metamorphic rocks like gneiss or schist during high pressure and temperature events.
Uses & applications
Quartz is used in glass making, electronics (oscillators), and as a decorative stone. This specific raw specimen is primarily for geological study or landscaping.
Geological facts
Quartz veins are often the primary source of gold in many of the world's famous gold rushes, as the same hydrothermal fluids that deposit quartz often transport gold.
Field identification & locations
Identify in the field by its hardness (will scratch glass) and its bright white, glassy appearance compared to the surrounding dark or foliated metamorphic matrix.
