Formula: Mg5(CO3)4(OH)2 . 4H2O
Origin of name: From Greek hydor = water and magnesite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
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Habit: Crystals acicular or bladed, elongated parallel to c-axis, in sprays, rosettes, or crusts; massive, powdery, chalk-like
Hardness: 3.5
Specific gravity: 2.25
Cleavage: 1; {010} perfect
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