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Formula: Ca3Ti2(SiFe3+2)O12
Nesosilicate (insular SiO4 groups), schorlomite group,
garnet supergroup, forms a series with
andradite
Crystal System: Isometric
Specific gravity:3.69 to 3.88 measured, 3.77 calculated
Hardness: 7 to 7½
Streak: Dark brown
Colour: Pitch black, brownish black
Common impurities: Na,Al,Mn,Mg,Na,K,H20,P,Zr,V
Environments
Plutonic igneous environments
Carbonatites
Metamorphic environments
Schorlomite occurs principally in alkaline igneous rocks, such as syenite and
fenite (Dana), also in carbonatites, phonolite
and skarn
(HOM).
Localities
At the type Locality, Magnet Cove, Hot Spring Co., Arkansas, USA, schorlomite is associated with
leucite, brookite,
nepheline and K-feldspar
(HOM).
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