Chlormagaluminite

Formula:  (Mg,Fe)4Al2(OH)12(Cl2,CO3) . 2H2O

Origin of name:  From composition

 

Crystal system:  Hexagonal

Crystal class:  -6m2

Twinning:

Unit cell:

 

Colour:  Colourless to yellowish brown

Diaphaneity:

Luster:

Habit:  Aggregates of hexagonal dipyramids

Hardness:

Specific gravity:  1.98 to 2.09

Cleavage:  1; {0001} basal

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:

 

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