Home Ankerite
V - Carbonates

 
Name   Ankerite
(Brown Spar)
Chemistry   CaFe2+[CO3]2
Hardness   3.5 - 4
Lustre   vitreous - pearly
Colour   brown, brownish yellow, grey, grey brown or white
Streak   white 
Density [g/cm3]   2.9 - 3.1
Crystal habit   trigonal-rhomboherdal
Cleavage, Fracture   [1011] perfect, fracture conchoidal
other characteristics and occurrences   dolomite-group, intermediate link during replacement of calcite (CaCO3) by siderite (FeCO3)
   

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© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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