Formula: Na3Mg(CO3)2Cl
Origin of name: for C. Northup, American discoverer of mineral
Crystal system: cubic
Crystal class: 2/m -3
Twinning:
Unit cell: a = 13.98 Å
Colour: colourless, yellowish, gray, brownish from impurities
Diaphaneity: transparent
Luster: vitreous
Habit: crystals octahedral
Hardness: 3.5 to 4
Specific gravity: 2.38
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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