Charoite

Formula:  K(Ca,Na)2Si4O10(OH,F)  . H2O

Origin of name:  From Russian chary - charms or magic

 

Crystal system:  Monoclinic

Crystal class:  Unknown

Twinning:

Unit cell:

 

Colour:  Lilac to violet

Diaphaneity:  Translucent

Luster:

Habit:  Massive

Hardness:

Specific gravity:  2.54

Cleavage:  3; Three directions

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:

 

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