Formula: CaMg(CO3)2
Origin of name: For D de Dolomieu, French geologist
Crystal system: Hexagonal
Crystal class: -3
Twinning: Common on {0001}, {10-10}, or {11-20}; rare on {10-11}; on {02-21}, lamellar
Unit cell: a = 4.81 Å, c = 16.02 Å
Colour: Colourless, white, grayish, greenish, pale brown, pinkish
Diaphaneity:
Luster: Vitreous to pearly
Habit: Crystals simple rhombohedrons, often with curved faces, rarely tabular or octahedral; crystalline aggregates; massive
Hardness: 3.5 to 4
Specific gravity: 2.85
Cleavage: 1; {10-11} perfect
Tenacity: Subconchoidal; brittle
Streak:
Synonyms/varieties:
Comments: Series with ankerite and with kutnohorite
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