The crystallographic and physical characters resemble those of dolomite and chalybite.
They are often impure, and their iron may be present as haematite or as chalybite.
It is rhombohedral in crystallization and isomorphous with calcite and chalybite.
chalybite, which is carbonate of iron, is an ore of great importance.
chalybite, kal′i-bīt, n. native iron protocarbonate—siderite.
chalybite is usually yellowish-grey or brown in colour; it is translucent and has a vitreous lustre.
All carbonates are soluble with effervescence in dilute acids; some, such as chalybite and magnesite, require the aid of heat.
When limonite is dehydrated and deoxidized in the presence of carbonic acid, it may give rise to chalybite.