Formula: Ca3(Ti,Al. Zr)9O20
Origin of name: for Alfred Louis Johannes Uhlig (1883-1919), German geologist, leader of the African expedition in which the material was first collected.
Crystal system: Cubic/Isometric, probably pseudocubic
Crystal class: unknown
Twinning: on {111}
Unit cell: a = 7.639
Colour: Black
Diaphaneity: Subtranslucent to opaque
Luster: Metallic
Habit: Octahedral crystals, striated || [011], twinning common
Hardness: 5.5
Specific gravity: 4.15
Cleavage: 1; {001} imperfect
Tenacity: Conchoidal fracture
Streak: Brownish gray
Synonyms/varieties:
Comments:
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