Formula: K3Na8Fe(SO4)6(NO3)2.6H2O
Origin of name: for Henri-Leon Ungemach (1880-1936), Belgian crystallographer.
Crystal system: Hexagonal
Crystal class: 3
Twinning:
Unit cell: a = 10.898, c = 24.989
Colour: Colourless to pale yellow
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals thick tabular, pseudorhombohedral
Hardness: 2.5
Specific gravity: 2.29
Cleavage: 1; {0001} perfect
Tenacity: Brittle, irregular fracture
Streak: White
Synonyms/varieties:
Comments:
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