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Mineralpedia Details for Ankerite

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Ankerite

Ankerite

Formula
CaFe2+(CO3)2 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Massive, Granular 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
brown, brownish yellow, gray, gray brown, white 
Streak
white 
Class
Trigonal - Rhombohedral 
Fracture
Sub Conchoidal 
Hardness
3.5-4 
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Ankerite from Huancavelica, Peru

Ankerite
            from Huancavelica, Peru

Large rhombic 3cm crystals of Ankerite with 2-5mm Tennantite(?) crystals.

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Ankerite from Jeffrey Quarry, Pulaski Co., Arkansas, United States

Ankerite
            from Jeffrey Quarry, Pulaski Co., Arkansas, United States

Dull orange brown, discoidal and rounded, perhaps corroded Ankerite crystals suspended by waterclear Quartz crystals. 

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