Formula: Ca (UO2) (CO3)2 .5H2O
Origin of name: for Howard D. Zeller (1922-), U. S. Geological Survey, who found the mineral.
Crystal system: Orthorhombic
Crystal class: mm2 or 2/m 2/m 2/m
Twinning:
Unit cell: a = 11.22, b = 19.252, c = 4.933
Colour: Light lemon-yellow; chalky yellow when dehydrated
Diaphaneity:
Luster: Dull, earthy
Habit: Crystals acicular to fibrous, hair-like or needle-like, forming pincushion-like clumps
Hardness: ~2
Specific gravity: 3.25
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Fluoresces weak mottled green
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