Formula: MgCO3 . 5H2O
Origin of name: From locality; Lansford, Carbon Co., Pennsylvania
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Colourless, white
Diaphaneity: Transparent to translucent
Luster: Vitreous, becomes dull on exposure
Habit: Crystals short prismatic, minute; stalactitic
Hardness: 2.5
Specific gravity: 1.69
Cleavage: 2; {001} perfect, {100} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: Becomes opaque on exposure
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