Queitite

Formula: Pb₄Zn₂(SiO₄)(Si₂O₇)(SO₄)

Origin of name: for Clive Queit, Namibian mineral dealer

Crystal system: Monoclinic

Crystal class: 2

Twinning: on {100} and {001}

Unit cell: a = 11.362, b = 5.266, c = 12.652, β = 108.16°

Colour: Colourless, pale yellow to white

Diaphaneity: Transparent

Luster: Greasy

Habit: Crystals tabular on c-axis, elongated along b-axis to 10 mm

Hardness: 4

Specific gravity: 6.07

Cleavage: 2; {010} and {001} in traces

Tenacity: 

Streak: White

Synonyms/varieties:

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