Stolzite

Formula: PbWO4

Origin of name: for J. Stolz, Czech Republic

 

Crystal system: tetragonal

Crystal class: 4/m

Twinning:

Unit cell: a = 5.462 Å, c = 12.05 Å

 

Colour: yellowish gray, tan to brown, reddish brown, yellowish red to red

Diaphaneity: 

Luster: subadamantine, resinous

Habit: crystals dipyramidal, thick tabular, rarely prismatic, faces striated

Hardness: 2.5 to 3

Specific gravity: 7.9 to 8.34

Cleavage: 2; {001} imperfect, {011} indistinct

Tenacity: conchoidal to uneven, brittle

Streak: colourless

 

Synonyms/varieties:

 

Comments: dimorphous with raspite

 

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