Hieratite

Formula:  K2SiF6

Origin of name:  After locality; Latin name for Vulcano (Hiera), Lipari Islands, Italy

 

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning: 

Unit cell: 

 

Colour:  Colourless, white, gray

Diaphaneity:  Transparent

Luster:  Vitreous

Habit:  Stalactitic concretions, dense to spongy texture

Hardness:  ~ 2.5

Specific gravity:  2.67

Cleavage:  1; {111} perfect

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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