Rosenbergite

Formula: AlF3.3H2O

Origin of name: for Philip E. Rosenberg, American geologist

 

Crystal system: tetragonal

Crystal class: 4/m

Twinning:

Unit cell: 

 

Colour: colourless

Diaphaneity: transparent

Luster: vitreous

Habit: radiating tufts of slender tetragonal prisms

Hardness: 3

Specific gravity: 2.101

Cleavage: 1; {001} good

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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