Inosilicate (chain silicate), pyroxene group, monoclinic paramorph of orthorhombic ferrosilite, forms a series with clinoenstatite
Specific gravity: 4.068
Hardness: 5 to 6
Colour: Brown, colourless, green
Volcanic igneous rocks
At Lake Naivasha, Kajiado County, Kenya, clinoferrosilite is found as minute needles in lithophysae (hollow, bubblelike, or roselike spherulites, usually with a radial and concentric structure, that occur in certain rhyolites, obsidians and related rocks (Mindat)) in obsidian, with anorthoclase, cristobalite, magnetite, fayalite and biotite (AM 21.678).
The type locality is Obsidian Cliff, Park county, Wyoming, USA.
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