Sabugalite

Formula: HAl(UO2)4(PO4)4.16H2O

Origin of name: after locality Sabugal County, Beira Alta, Portugal

 

Crystal system: monoclinic, pseudotetragonal

Crystal class: 2/m

Twinning:

Unit cell: 

 

Colour: bright yellow to lemon-yellow

Diaphaneity: transparent to translucent

Luster: vitreous (weakly)

Habit: crystals square or lath-like plates, to 0.1 mm, crusts, densely aggregated

Hardness: 2.5

Specific gravity: 3.2

Cleavage: 1; {001} perfect

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: fluoresces lemon-yellow

 

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