Malladrite

Formula:  Na2SiF6

Origin of name:  For A. Malladra, Italian volcanologist

 

Crystal system:  Hexagonal

Crystal class:  32

Twinning: 

Unit cell: 

 

Colour:  Pale rose

Diaphaneity: 

Luster: 

Habit:  Crusts

Hardness

Specific gravity:  2.714

Cleavage:  None

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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