Pentahydrite

Formula: MgSO4.5H2O

Origin of name: from composition

 

Crystal system: triclinic

Crystal class: -1

Twinning: 

Unit cell: 

 

Colour: white, light blue, light greenish blue

Diaphaneity: 

Luster: 

Habit: massive, granular or slightly platy

Hardness

Specific gravity: 1.90

Cleavage: none

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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