Polarite

Formula: BiPbPd2

Origin of name: after locality Polar Urals, Russia

 

Crystal system: orthorhombic

Crystal class: mm2

Twinning: 

Unit cell: 

 

Colour: white in reflected light

Diaphaneity: 

Luster: metallic

Habit: massive, minute grains to 0.3 mm

Hardness: 4

Specific gravity: 12.51

Cleavage: none

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: dimorphous with sobolevskite

 

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