General Information:
Chemical Formula:
Ca3(Ti,Fe+++,Al)2[(Si,Fe+++,Fe++)O4]3
Composition:
(Molecular Weight = 516.73 gm)
Calcium 23.27 % Ca
Titanium 15.75 % Ti
Aluminum 0.52 % Al
Iron 11.89 % Fe
Silicon 11.41 % Si
Oxygen 37.16 % O
Empirical Formula:
Ca3Ti1.7Fe3+0.2Al0.13(Si0.7)3(Fe3+0.2)3(Fe2+0.1)3(O4)
Environment:
Alkaline igneous rocks.
Locality:
Magnet Cove, Hot Springs County, Arkansas.
Name Origin:
Named for the mineral schorl and from the Greek "homos," the same, in allusion to its resemblance to schorl.
Physical Properties:
Cleavage:
None
Color:
pitch black or brownish black.
Density:
3.81 - 3.88, Average = 3.84
Diaphaniety:
Translucent to Subopaque
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., ,
Hardness:
7-7.5
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Metallic
Streak:
dark brown
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