Lead

Formula:  Pb

Origin of name:  Old English word for the substance

 

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning: 

Unit cell: a = 4.951 Ǻ

 

Colour:  Gray-white

Diaphaneity: 

Luster:  Metallic, tarnishes lead-gray

Habit:  Crystals octahedral or cubic or dodecahedral, rare; massive, thin plates, wires, dendritic, rounded masses

Hardness:  1.5

Specific gravity:  11.347 to 1.35

Cleavage:  None

Tenacity:  Malleable, ductile

Streak:  Lead-gray

 

Synonyms/varieties:

 

Comments: 

 

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