metamorphic
Quartz Vein in Mica Schist
Quartz (SiO2) with Muscovite/Biotite Schist
Hardness: 7 (Quartz) and 2-3 (Schist); Color: Milky white to grey quartz on silvery-grey/greenish schist; Luster: Vitreous (glassy) quartz, pearly to sub-metallic schist; Crystal Structure: Trigonal (quartz), Monoclinic (mica); Cleavage: None (Quartz), Perfect basal (Mica).
- Hardness
- 7 (Quartz) and 2-3 (Schist)
- Color
- Milky white to grey quartz on silvery-grey/greenish schist
- Luster
- Vitreous (glassy) quartz, pearly to sub-metallic schist
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Physical properties
Hardness: 7 (Quartz) and 2-3 (Schist); Color: Milky white to grey quartz on silvery-grey/greenish schist; Luster: Vitreous (glassy) quartz, pearly to sub-metallic schist; Crystal Structure: Trigonal (quartz), Monoclinic (mica); Cleavage: None (Quartz), Perfect basal (Mica).
Formation & geological history
Formed during regional metamorphism where high pressure and temperature cause recrystallization of rocks. The quartz vein likely formed from hydrothermal fluids filling cracks in the schist layer during tectonic activity.
Uses & applications
Quartz is used in glassmaking, electronics (oscillators), and as an abrasive; schist is occasionally used as a decorative stone in architecture or landscaping. The combined specimen is primarily of interest for educational and collection purposes.
Geological facts
Schist is characterized by its sheet-like minerals which give it a sparkly 'schistose' texture. The presence of large quartz veins often indicates high hydrothermal activity in the area's geological history.
Field identification & locations
Identify by looking for the contrast between the hard, glassy white quartz and the flaky, foliated silver-grey host rock. Common in mountain ranges and ancient metamorphic terranes worldwide.
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