Formula: Zn(OH)2
Origin of name: for Ernst Anton Wülfing (1860-1930), professor of mineralogy and petrography, Heidelberg University, Germany.
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 8.49, b = 5.162, c = 4.917
Colour: Colourless to white
Diaphaneity: Transparent to translucent
Luster: Waxy
Habit: fine-grained incrustations of zinc or zincite or small crystals to 200 micron, pseudo-octahedral
Hardness: 3
Specific gravity: 3.06
Cleavage: None
Tenacity: Conchoidal fracture
Streak: White
Synonyms/varieties: Wuelfingite
Comments: dimorphous with sweetite, soluble in dilute acids
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