Mallardite

Formula: MnSO4 . 7H2O

Origin of name:  For F. E. Mallard, French crystallographer

 

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning: 

Unit cell: 

 

Colour:  Pale rose

Diaphaneity: 

Luster:  Vitreous

Habit:  Fibrous, masses and crusts

Hardness:  ~ 2

Specific gravity:  1.846

Cleavage:  1; {001} good

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments:  Soluble in water; dehydrates rapidly becoming opaque and mealy

 

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