metamorphic
Schist with Quartz Veins
Schist with Quartz (SiO2)
Medium to coarse-grained metamorphic rock with strong foliation. Contains significant amount of platy minerals like mica (muscovite or biotite), often interleaved with quartz or feldspar. Hardness varies depending on mineral composition (Quartz is 7 on Mohs scale, micas are softer).…
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Physical properties
Medium to coarse-grained metamorphic rock with strong foliation. Contains significant amount of platy minerals like mica (muscovite or biotite), often interleaved with quartz or feldspar. Hardness varies depending on mineral composition (Quartz is 7 on Mohs scale, micas are softer). Color can be silvery, gray, black, or greenish.
Formation & geological history
Formed from regional metamorphism of shale or mudstone under high temperature and pressure conditions, typically deep within the Earth's crust over millions of years. Quartz veins form from hydrothermal fluids filling fractures.
Uses & applications
Often used for decorative landscaping, sometimes as a building stone or road material if competent enough. Quartz veins are sometimes prospected for gold or other valuable minerals.
Geological facts
Schist is characterized by its heavily foliated (layered) appearance, known as schistosity, which allows it to split easily into flakes or slabs.
Field identification & locations
Identify by its foliated texture and shiny appearance due to mica flakes. Quartz veins appear as white, hard bands cutting through or running parallel to the foliation. Found in areas with a history of mountain building.
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