Stilpnomelane
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Stilpnomelane is a phyllosilicate mineral. It has the chemical formula K81227·n.
Stilpnomelane 217448
Greenschist
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Greenschists are metamorphic rocks that formed under the lowest temperatures and pressures usually produced by regional metamorphism, typically 300–450 °C and 2–10 kilobars. Greenschists commonly have
Stilpnomelane
…Si,Al)12(O,OH)27·n(H2O). Stilpnomelane occurs associated with banded iron formations. It is a metamorphic mineral associated with the blueschist and greenschist facies. It was first described in 1827 for an occurrence in Moravia in the Czech Republic. The name is derived from the Greek stilpnos for shining, and…
Chlorite schist, a type of greenschist
Greenschist (prasinite) at Cap Corse in Corsica, France
Greenschist (epidote) from Itogon, Benguet, Philippines
Prasinite variety of greenschist (Mont-Cenis massif, French Alps)