Hydromagnesite

Formula:  Mg5(CO3)4(OH)2 . 4H2O

Origin of name:   From Greek hydor = water and magnesite

 

Crystal system:  Monoclinic

Crystal class:  2/m

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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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