Anglesite

Formula:  PbSO₄

Origin of name:  Locality; Island of Anglesey, Wales, Great Brittain

Crystal system:  Orthorhombic

Crystal class:  2/m 2/m 2/m

Twinning:

Unit cell:   a = 8.480 Å, b = 5.398 Å, c = 6.958 Å

Colour:  Colourless, white, yellowish, gray, pale green and blue

Diaphaneity: Transparent to translucent

Luster:  Adamantine, resinous

Habit:  Crystals varied in habit, thin to thick tabular, prismatic or equant; massive, granular, nodular, stalactitic

Hardness:  2.5 to 3

Specific gravity:  6.38

Cleavage:  3; {001} good, {210} distinct, {010} indistinct

Tenacity:  Brittle

Streak:  Colourless

Synonyms/varieties:

Comments:  Sometimes fluoresces yellow. Found in weathered secondary deposits of lead ore.