metamorphic
Quartz with Schist Matrix
Crystalline Silicon Dioxide (SiO2) in micaceous schist
Hardness: 7 (Quartz) and 2-3 (Matrix); Color: White/Translucent quartz with dark grey/black host rock; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (Quartz has conchoidal fracture).
- Hardness
- 7 (Quartz) and 2-3 (Matrix)
- Color
- White/Translucent quartz with dark grey/black host rock
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Quartz) and 2-3 (Matrix); Color: White/Translucent quartz with dark grey/black host rock; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (Quartz has conchoidal fracture).
Formation & geological history
Formed through regional metamorphism where intense heat and pressure recrystallized ancient sedimentary rocks. The quartz veins often form as hydrothermal fluids fill fractures in the existing rock layers.
Uses & applications
Informal mineral collection, decorative landscaping, and research into local geology. Pure quartz is used in electronics and glass-making, but specimen-grade quartz like this is for hobbyists.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Specimens like this, featuring a contrasting host rock (matrix), are valuable for geologists to understand the pressure and temperature conditions during formation.
Field identification & locations
Identify by the characteristic 'glassy' look of the white mineral and its ability to scratch glass. Look for it in mountainous regions, riverbeds, or areas with exposed metamorphic bedrock.
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