Formula: Th(Ca,Ce)(CO3)2F2.3H2O
Origin of name: from thorium and bastnäsite
Crystal system: Hexagonal
Crystal class: 6m2
Twinning:
Unit cell: a = 6.99, c = 9.71
Colour: Brown
Diaphaneity: Translucent
Luster: Vitreous-greasy
Habit: massive, cryptocrystalline
Hardness: 4-4.5
Specific gravity: 4.04, thought low due to excess water (5.70 calculated)
Cleavage:
Tenacity:
Streak:
Synonyms/varieties: Thorbastnaesite
Comments: Radioactive.
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