metamorphic
Quartz Vein in Matrix (Breccia / Host Rock with Quartz)
Silicon Dioxide (SiO2) in Host Rock Matrix
Hardness: 7 for quartz vein, lower to similar for matrix (Mohs scale 5.5-7). Color: Gray, brownish host rock with a prominent milky-white crystalline quartz vein. Luster: Vitreous to dull. Cleavage: None in quartz (conchoidal fracture), uneven fracture in host rock. Specific Gravity: ~2.65.
- Hardness
- 7 for quartz vein, lower to similar for matrix (Mohs scale 5
- Luster
- Vitreous to dull
Identified More metamorphic →
Explore Quartz Vein in Matrix (Breccia / Host Rock with Quartz) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 for quartz vein, lower to similar for matrix (Mohs scale 5.5-7). Color: Gray, brownish host rock with a prominent milky-white crystalline quartz vein. Luster: Vitreous to dull. Cleavage: None in quartz (conchoidal fracture), uneven fracture in host rock. Specific Gravity: ~2.65.
Formation & geological history
Formed via hydrothermal activity where silica-rich fluids filled fractures, cracks, or voids in an existing sedimentary or metamorphic host rock, cooling and precipitating as milky quartz veins over millions of years.
Uses & applications
Primarily collected as a geological interest or mineral display specimen. Larger veins of quartz are mined as sources of silica for glassmaking, silicon chips, and construction aggregate.
Geological facts
Quartz veins frequently act as indicator minerals in economic geology; major gold deposits worldwide are found hosted within hydrothermal quartz veins intruding into older country rock.
Field identification & locations
Identified by the distinct contrast between the milky white crystalline silica and the darker, fine-grained surrounding host rock. Commonly found in stream beds, mountain ranges, and eroded rocky outcrops worldwide. Collectors can look for crystal pocket formations along the vein boundaries.
More like this
