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A mineral of dolomite group in which some of the magnesium is replaced by iron, and manganese. Ankerite was first recognized as a unique mineral by W. von Haidinger in 1835. Deposits are often found with siderite in iron-ore.

Synonyms and Related Terms

brown-spar; pearl-spar; bitter-spar; ankerite (Port.)

Other Properties

Color is white, gray, yellow-brown, or reddish-brown.

Composition Ca(Fe, Mg, Mn)(CO3)2
Mohs Hardness 3.5-4.0
Density 2.9-3.1

Sources Checked for Data in Record

  • Submitted information Comment: Jose Delgado Rodrigues, LNEC, 2009.