Formula: Ca5(AsO4,PO4)3Cl
Origin of name: for Frederick Turneaure, American geologist
Crystal system: hexagonal
Crystal class: 6/m
Twinning:
Unit cell: a = 9.81, c = 6.868
Colour: colourless, gray white
Diaphaneity: transparent to translucent
Luster: vitreous to greasy
Habit: crystals prismatic, to 1.5 mm, anhedral masses
Hardness: 5
Specific gravity: 3.60
Cleavage: none
Tenacity: Uneven fracture
Streak: white
Synonyms/varieties:
Comments: Cl analogue of svabite and johnbaumite, as analogue of chlorapatite, Ca analogue of morelandite and mimetite, fluoresces bright orange in SW ultraviolet light
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