Alamosite

Formula:  PbSiO3

Origin of name:  Locality; Alamos, Sonora, Mexico

 

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: a = 12.247 Å, b = 7.059 Å, c = 11.236 Å, b = 113.12°

 

Colour:  Colourless, white

Diaphaneity: Transparent to translucent

Luster:  Adamantine

Habit:  Crystals fibrous, radiating  aggregates

Hardness:  4.5

Specific gravity:  6.49

Cleavage:  1; {010} perfect

Tenacity:

Streak: White

 

Synonyms/varieties:

 

Comments: Found as a rare secondary mineral in the oxidised zone of  lead-bearing base metal deposits

 

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