igneous/metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within metamorphic/igneous matrix
Hardness: 7 (Quartz part), 5-6 (Host rock). Color: White milky quartz and brownish-grey host rock. Luster: Vitreous to dull. Crystal structure: Trigonal (quartz). Cleavage: None/Conchoidal fracture.
- Hardness
- 7 (Quartz part), 5-6 (Host rock)
- Color
- White milky quartz and brownish-grey host rock
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (Quartz part), 5-6 (Host rock). Color: White milky quartz and brownish-grey host rock. Luster: Vitreous to dull. Crystal structure: Trigonal (quartz). Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed through hydrothermal deposition where mineral-rich hot water flows through fractures in existing rock, cooling and crystallizing quartz over thousands of years.
Uses & applications
Quartz is used in glassmaking, electronics (oscillators), and as an abrasive. Specimens like this are primarily for education or amateur collecting.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Vein quartz is often a primary source for gold, as the same hydrothermal fluids that deposit quartz often carry heavy metals.
Field identification & locations
Identify by its ability to scratch glass and its contrast against the darker host rock. Look for the 'waxy' or 'sugary' appearance of the white band.
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