mineral with metamorphic or sedimentary host
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs); Color: Milky tan to white quartz paired with greyish-brown host rock; Luster: Vitreous to greasy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture).
- Hardness
- 7 (Mohs)
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Mohs); Color: Milky tan to white quartz paired with greyish-brown host rock; Luster: Vitreous to greasy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through hydrothermal processes where mineral-rich hot water flows through fractures in pre-existing rocks, depositing silica that cools and crystallizes into quartz. Common in orogenic belts and tectonic zones.
Uses & applications
Quartz is used in glassmaking, electronics (piezoelectric properties), and as an abrasive. Specimens like this are primarily of educational or local geological interest.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Vein quartz often acts as a 'host' for precious metals like gold in certain geological environments.
Field identification & locations
Identify by the contrast in hardness between the harder quartz vein and the surrounding rock. It will easily scratch glass. Found commonly in creek beds, mountain trails, and construction sites.
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