Formula: (Ca,U,Fe)(PO4,SO4).2H2O
Origin of name: for Sir Tristram of Arthurian legend
Crystal system: hexagonal
Crystal class: 622
Twinning:
Unit cell:
Colour: pale yellow to greenish yellow
Diaphaneity:
Luster:
Habit: crystals acicular to fibrous, 5 to 80 micron
Hardness:
Specific gravity: 3.8 to 4.2
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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