Formula: (Ba,Ca)2(UO2)3(PO4)2(OH)4 . 5.5H2O
Origin of name: After locality; near Bregen on the Trieb River, Saxony, Germany
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 16.05 Ǻ, b = 17.76 Ǻ, c = 13.86 Ǻ, β = 93.0°
Colour: Yellow
Diaphaneity:
Luster:
Habit: Crystals thin tabular
Hardness:
Specific gravity: > 4.1
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Fluoresces weak orange-brown
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