Siderotil

Formula: FeSO4.5H2O

Origin of name: from Greek sideros = iron and tilos = fiber

 

Crystal system: triclinic

Crystal class: -1

Twinning:

Unit cell: 

 

Colour: white to yellowish, pale greenish white

Diaphaneity: 

Luster: 

Habit: crystals acicular, as divergent groups and fibrous crusts

Hardness

Specific gravity: 2.1 to 2.2

Cleavage: none

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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