metamorphic
Quartz Vein in Schist
Quartz (SiO2) in Pelitic Schist
Hardness: 7 (quartz) to 4-5 (schist matrix), Color: White quartz veins with grey/brown micaceous matrix and orange iron staining, Luster: Vitreous to dull/earthy, Crystal Structure: Trigonal (quartz) and foliated (schist), Cleavage: None in quartz; distinct planar cleavage in schist.
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Physical properties
Hardness: 7 (quartz) to 4-5 (schist matrix), Color: White quartz veins with grey/brown micaceous matrix and orange iron staining, Luster: Vitreous to dull/earthy, Crystal Structure: Trigonal (quartz) and foliated (schist), Cleavage: None in quartz; distinct planar cleavage in schist.
Formation & geological history
Formed via regional metamorphism of clay-rich sedimentary rocks (shales) under moderate to high heat and pressure. The white quartz veins were deposited by hydrothermal fluids filling fractures during the metamorphic process.
Uses & applications
Primarily used as a decorative landscaping stone, a source of crushed aggregate for construction, or as an indicator for prospectors seeking precious metals like gold.
Geological facts
Quartz veins in metamorphic rocks are often the primary source of 'mother lodes' in gold rushes, as hydrothermal fluids frequently carry dissolved metals along with silica.
Field identification & locations
Identify by looking for white, crystalline layers 'sandwiched' or cutting through foliated, flaky darker rock. Found globally in mountain belts and metamorphic terrains. Collectors should look for signs of mineralization at the contact points.
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