Hilairite

Formula:  Na2ZrSi3O9 . 3H2O

Origin of name:  Locality; Mont St. Hilaire, Quebec, Canada

 

Crystal system:  Hexagonal

Crystal class:  32

Twinning: 

Unit cell: a = 10.556, c = 15.851

 

Colour:  Pale brown

Diaphaneity:  Transparent

Luster:  Vitreous to porcelaneous

Habit:  Crystals, tiny, aggregates

Hardness:  4.5

Specific gravity:  2.72

Cleavage:  None

Tenacity: 

Streak:  White

 

Synonyms/varieties:

 

Comments: 

 

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