Althupite

Formula:  ThAl(UO2)7(PO4)4O2(OH)5.15H2O

Origin of name:  From the major elements in composition

 

Crystal system:  Triclinic

Crystal class:  -1

Twinning:

Unit cell: a = 10.953 Å, b = 18.567 Å, c = 13.504 Å, a = 72.64°, b = 68.20°, g = 84.21°

 

Colour:  Yellow

Diaphaneity: Transparent to translucent

Luster: Vitreous

Habit:  Thin tablets to 0.1 mm, in parallel groups

Hardness:

Specific gravity:  3.9

Cleavage:  

Tenacity:

Streak: Yellow white

 

Synonyms/varieties:

 

Comments: Radioactive. Found as a secondary mineral in the uraniferous zone of an altered granite pegmatite.

 

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