Letovicite

Formula:  (NH4)3H(SO4)2

 

Origin of name:  For locality; Letvice, Czech Republic

 

Crystal system:  Triclinic

Crystal class:  1 or -1

Twinning: 

Unit cell: 

 

Colour:  Colourless, white

Diaphaneity:  Transparent

Luster: 

Habit:  Crystals pseudohexagonal plates, minute; massive, granular

Hardness:

Specific gravity:  1.83

Cleavage:  1; {001} distinct

Tenacity: 

Streak: 

 

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