igneous
Quartz Vein in Matrix
Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix
Hardness: 7 (quartz), 5-6 (matrix); Color: Milky white to translucent center, grayish-green host rock; Luster: Vitreous to greasy on quartz, dull on matrix; Crystal structure: Hexagonal/Trigonal quartz crystals; Cleavage: None (conchoidal fracture on quartz).
- Hardness
- 7 (quartz), 5-6 (matrix)
- Color
- Milky white to translucent center, grayish-green host rock
- Luster
- Vitreous to greasy on quartz, dull on matrix
Identified More igneous →
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Physical properties
Hardness: 7 (quartz), 5-6 (matrix); Color: Milky white to translucent center, grayish-green host rock; Luster: Vitreous to greasy on quartz, dull on matrix; Crystal structure: Hexagonal/Trigonal quartz crystals; Cleavage: None (conchoidal fracture on quartz).
Formation & geological history
Formed through hydrothermal processes where silica-rich hot fluids filled cracks or voids in a host rock (likely an igneous volcanic rock like rhyolite or dacite). This process can occur over millions of years as minerals crystallize out of cooling fluids.
Uses & applications
Used primarily for geological study, landscaping, or as a decorative specimen. High-purity quartz is used in glassmaking and electronics.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Vein quartz often acts as a host to precious metals like gold in 'lode deposits,' though this specimen appears to be purely quartz.
Field identification & locations
Identified by the distinct white, crystalline center contrasting with the duller host rock. Quartz will easily scratch glass, while the surrounding matrix may not. Common in mountainous regions with historical volcanic activity.
