Formula: BaAl3(SO4)2(OH)6
Origin of name: after Thomas N. Walthier, geologist who played a significant role in the exploration of the El Indio and Tambo mining districts, Coquimbo region (Chile).
Crystal system: Trigonal
Crystal class: 3 2/m
Twinning:
Unit cell: a = 6.992, c = 34.443
Colour: White to yellowish
Diaphaneity: Transparent
Luster: Vitreous
Habit: Subhedral to anhedral tabular crystals 5 to 100 micron, grains, aggregates
Hardness: 3-4
Specific gravity: 3.02
Cleavage: 1; {001} perfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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