Formula: Na3(CO3)(HCO3).2H2O
Origin of name: Swedish name derived from Arabic natrun = native salt
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: colourless, grayish, yellowish, white, pale brownish
Diaphaneity: transparent to translucent
Luster: vitreous, glistening
Habit: crystals elongated, flattened, massive, fibrous or columnar, thick plates
Hardness: 2.5 to 3
Specific gravity: 2.11
Cleavage: 3; {100} perfect, {-111} distinct, {001} indistinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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