Douglasite

Formula:   K2FeCl4 . 2H2O

Origin of name:   Locality; Douglashall, Saxony, Germany

 

Crystal system:   Monoclinic

Crystal class:   Unknown

Twinning:

Unit cell: 

 

Colour:   Light green; alters to brownish red on exposure

Diaphaneity:

Luster:   Vitreous

Habit:   Massive, coarse granular

Hardness:

Specific gravity:   2.16

Cleavage:   None

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments:

 

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