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Formula: Fe2+SiO3
Inosilicate (chain silicate), forms a series with pyroxmangite,
paramorph of clinoferrosilite,
ferrosilite and hemleyite
Crystal System: Triclinic
Specific gravity: 3.68 to 3.76 measured, 3.82 calculated
Hardness: 4½ to 5½
Streak: White
Colour: Pale yellow, orange-yellow, yellow, light brown
Solubility: Insoluble in acids
Common impurities: Ti,Al,Mg,Na
Environments:
Localities
The type locality is the Mare Tranquillitatis, on the Moon. The mineral occurs as discrete grains in
rocks collected
by the Apollo XI mission. The rocks are microgabbros or
dolerites with major
clinopyroxene,
plagioclase and ilmenite, and
with minor
pyroxferroite, cristobalite,
tridymite,
fayalite, fluorapatite and
K-feldspar
(AM 55.2137).
It also occurs at several localities in Earth as detailed in (Mindat).
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