Schorlomite

Formula: Ca₃Ti₂(Fe₂Si)O₁₂

Origin of name: from Greek homos = same and schörl

Crystal system: cubic

Crystal class: 4/m 3 2/m

Twinning:

Unit cell: a = 12.128

Colour: Black, brownish black

Diaphaneity: Translucent to opaque

Luster: Vitreous-metallic

Habit: Crystals dodecahedrons or trapezohedrons, massive, fine or coarse granular

Hardness: 7 to 7.5

Specific gravity: 3.761

Cleavage: None

Tenacity: Conchoidal fracture

Streak: Gray black, red orange and orange brown

Synonyms/varieties:

Comments: series with andradite