metamorphic
Quartz on Chlorite Schist
Chlorite Schist (Mg,Fe)3(Si,Al)4O10(OH)2 with Quartz (SiO2)
Hardness: 2-3 (Matrix) to 7 (Quartz); Color: Grayish-green to dark green with translucent white crystals; Luster: Vitreous to pearly; Crystal Structure: Monoclinic (Chlorite) and Trigonal (Quartz); Cleavage: Perfect basal cleavage in schist.
- Hardness
- 2-3 (Matrix) to 7 (Quartz)
- Color
- Grayish-green to dark green with translucent white crystals
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 2-3 (Matrix) to 7 (Quartz); Color: Grayish-green to dark green with translucent white crystals; Luster: Vitreous to pearly; Crystal Structure: Monoclinic (Chlorite) and Trigonal (Quartz); Cleavage: Perfect basal cleavage in schist.
Formation & geological history
Formed through low-to-medium grade regional metamorphism of mafic igneous rocks or clay-rich sediments. Typically occurs in mountain belts and subduction zones.
Uses & applications
Used primarily as decorative specimens for collectors; occasionally used in the production of low-grade building stone or industrial fillers.
Geological facts
Chlorite is what gives many metamorphic rocks their distinct green color. This specimen shows a common association where quartz veins permeate the schist during hydrothermal stages of metamorphism.
Field identification & locations
Identify by its 'schistose' foliated texture, distinct green hue, and greasy/soapy feel on the matrix contrasted with the hardness of the quartz. Common in the Appalachian Mountains and the Alps.
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