Hydrohalite

Formula:  NaCl . 2H2O

Origin of name:   From Greek hydor = water and halite

 

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning: 

Unit cell: 

 

Colour:  Colourless, white, pale gray, brown pink, green

Diaphaneity:  Transparent to translucent

Luster:  Vitreous to somewhat greasy

Habit:  Crystals octahedral, minute, rarely tetrahedral; massive, compact

Hardness:  6 to 6.5

Specific gravity:  3.0 to 3.3

Cleavage:  None

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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