Formula: (Zn, Fe)2 (Te O3)3 Nax H2-x
Origin of name: for Josef Zemann (1923-), Austrian mineralogist, University of Vienna, who studied tellurium oxysalts.
Crystal system: Hexagonal
Crystal class: 6/m
Twinning:
Unit cell: a = 9.381 Å, c = 7.610 Å
Colour: Light to dark brown
Diaphaneity:
Luster: Adamantine - vitreous
Habit: Crystals prismatic, dipyramid termination, hexagonal, <1 mm
Hardness: 1
Specific gravity: >4.05
Cleavage: None
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments:
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