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Silicate

Clinoferrosilite

Fe²⁺₂Si₂O₆
Hardness5–6
Crystal systemMonoclinic
ClassSilicate
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Clinoferrosilite specimen

Clinoferrosilite Field of view: 0.4 mm high crystal Locality: Sant'Antioco, South Sardinia Province, Sardinia, Italy — Photo: Henk Smeets – tomeikminerals.com · CC BY 4.0

Clinoferrosilite

Clinoferrosilite is an IMA-recognized mineral species in the silicate class, with the chemical formula Fe²⁺₂Si₂O₆.

It crystallizes in the monoclinic crystal system (space group P2_1/c). It is a member of the Pyroxene structural group.

Key properties: Mohs hardness 5–6; specific gravity 4.068; optically biaxial.

IMA symbol Cfs, IMA status: approved, named in 1935.

Occurs as acicular crystals in lithophysae in obsidian (Lake Naivasha, Kenya).

It is found associated with Anorthoclase, magnetite, cristobalite, fayalite, biotite (Lake Naivasha, Kenya).

The name refers to its monoclinic crystal system and chemical identity with ferrosilite.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more C minerals or help write this entry.