Formula: MnCO3
Origin of name: from Greek for rose and colour
Crystal system: hexagonal
Crystal class: -3 2/m
Twinning: rare on {01-12} lamellar
Unit cell: a = 4.78 Å, c = 15.67 Å
Colour: pale pink to deep red, orangish red, yellowish gray, tan, brown
Diaphaneity:
Luster: vitreous, pearly
Habit: crystals rhombohedral, rarely prismatic, scalenohedral or thick tabular, massive, compact to coarse granular, stalactitic
Hardness: 3.5 to 4
Specific gravity: 3.70
Cleavage: 2; {10-11} perfect, {01-12} parting
Tenacity: conchoidal to uneven, brittle
Streak:
Synonyms/varieties: dialogite
Comments: series with calcite and siderite
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