Schorlomite

Schorlomite is so named in 1846 because of its resemblance to schorl.

Schorlomite forms dark brown, reddish brown to black crystals up to 2 cm, masses are common.

Schorlomite has been cut into black cabochons.
General Information
Chemical Formula
Ca
 
3
Ti
4+
2
(Fe
3+
2
Si)O
 
12
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Photos of natural/un-cut material from mindat.org
Physical Properties of Schorlomite
Mohs Hardness7 to 7.5
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Specific Gravity3.77 to 3.93
Michael O’Donoghue, Gems, Sixth Edition (2006)
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TenacityBrittle
Anthony et al, Handbook of mineralogy (2001)
FractureConchoidal
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Optical Properties of Schorlomite
Refractive Index1.94 to 1.98
Michael O’Donoghue, Gems, Sixth Edition (2006)
Optical CharacterIsotropic
Anthony et al, Handbook of mineralogy (2001)
Colour
Colour (General)Dark brown, reddish brown to black.
Michael O’Donoghue, Gems, Sixth Edition (2006)
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TransparencyTranslucent,Opaque
Anthony et al, Handbook of mineralogy (2001) Translucent to nearly opaque
LustreVitreous,Metallic
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Crystallography of Schorlomite
Crystal SystemIsometric
Anthony et al, Handbook of mineralogy (2001)
HabitAs trapezohedra and dodecahedra, up to 2 cm; more commonly massive.
Anthony et al, Handbook of mineralogy (2001)
Geological Environment
Where found:Occurs principally in alkaline igneous rocks such as nepheline-syenite and related types; also in skarns.
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Further Information
Mineral information:Schorlomite information at mindat.org
Significant Gem Localities
Canada
 
  • British Columbia
    • Golden Mining Division
Finland
 
  • North Ostrobothnia
    • Kuusamo
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