metamorphic
Quartz with Mica Schist Matrix
Quartz (SiO2) in Mica Schist Matrix
Hardness: 7 for quartz, 2.5-3 for mica matrix. Color: Clear to off-white quartz with glittering silvery-tan to brownish mica host rock. Luster: Vitreous on quartz faces, pearly/pearly-metallic on mica flakes. Crystal Structure: Hexagonal (quartz) and monoclinic (mica).…
- Hardness
- 7 for quartz, 2
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Physical properties
Hardness: 7 for quartz, 2.5-3 for mica matrix. Color: Clear to off-white quartz with glittering silvery-tan to brownish mica host rock. Luster: Vitreous on quartz faces, pearly/pearly-metallic on mica flakes. Crystal Structure: Hexagonal (quartz) and monoclinic (mica). Cleavage: Perfect basal cleavage in mica, non-existent in quartz.
Formation & geological history
Formed through regional metamorphism of clay-rich sedimentary rocks (like shale or mudstone) under moderate to high temperatures and pressures. Often associated with quartz veins intrusion into metamorphic host rock.
Uses & applications
Quartz and mica have extensive industrial uses, including electronics, glassmaking, construction, and cosmetics (glitter in makeup from ground mica). Rough matrix specimens are popular for educational mineral sets and amateur rock collecting.
Geological facts
Mica schist is known for its distinctive shimmery appearance due to aligned mica flakes. Quartz veins within mica schists often harbor rare minerals and, in some famous gold-bearing districts, fine particles of native gold.
Field identification & locations
Identify by looking for shiny, flaky, layer-like mica minerals holding a harder, crystalline block of quartz. Commonly found in metamorphic terrains such as Appalachian, Alpine, and Himalayan mountain belts. Collectors should watch for flaky crumbling of the mica host.
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