Halotrichite

Formula:  FeAl2(SO4)4 . 22H2O

Origin of name:   From Latin, halotrichum = salt hair

 

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell:

 

Colour:  Colourless, white, yellowish, greenish

Diaphaneity:  Transparent to translucent

Luster:  Vitreous

Habit:  Crystals acicular, usually not terminated; incrustations; efflorescence

Hardness:  1.5

Specific gravity:  1.89

Cleavage:  1; {010} poor

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:  Series with pickeringite; soluble in water

 

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