metamorphic
Greenshist / Chlorite Schist
Chlorite schist (contains (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
Hardness: 2-3 on Mohs scale; Color: Greenish-gray, dark green to olive; Luster: Pearly to vitreous; Crystal structure: Monoclinic (foliated); Cleavage: Perfect basal cleavage in individual flakes.
- Hardness
- 2-3 on Mohs scale
- Color
- Greenish-gray, dark green to olive
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2-3 on Mohs scale; Color: Greenish-gray, dark green to olive; Luster: Pearly to vitreous; Crystal structure: Monoclinic (foliated); Cleavage: Perfect basal cleavage in individual flakes.
Formation & geological history
Formed by low-grade regional metamorphism of mafic igneous rocks (like basalt) or clay-rich sediments under moderate pressure and low temperature (greenschist facies). Common in mountain belts of various geological ages.
Uses & applications
Primarily used as decorative stone, in landscaping, and historically for carveable stone tools or architecture due to its relative softness.
Geological facts
Chlorite is the mineral responsible for the green color. This rock type is a primary indicator of the 'greenschist facies' in metamorphic petrology, representing specific pressure-temperature conditions deep in the Earth.
Field identification & locations
Identify in the field by its distinct green hue, foliated (layered) texture, and soapy or greasy feel when touched. Often found in proximity to mountain ranges or ancient subduction zones.
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