Formula: Ca0.5[] 0.5Al3(SO4)2(OH)6
Origin of name: For Yunhui Huang, Chinese mineralogist
Crystal system: Hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: White to yellowish
Diaphaneity: Transparent
Luster: Vitreous
Habit: Subhedral to anhedral tabular crystals 3-10 µm, aggregates, [] indicates vacancy in OMO site of alunite structure
Hardness:
Specific gravity: 2.80
Cleavage: 1; {001} perfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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