Hydrocalumite

Formula:  Ca2Al(OH)6(Cl,OH) .3H2O

Origin of name:   From composition

 

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning: 

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Colour:  Colourless to light green

Diaphaneity:  Transparent

Luster:  Vitreous, pearly on cleavages

Habit:  Massive

Hardness:  3

Specific gravity:  2.15

Cleavage:  1; {001} perfect

Tenacity: 

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