chalybite's Usage Examples:

In many cases it has been formed from other iron oxides, like haematite and magnetite, or by the alteration of pyrites or chalybite.

Chalybite >>When limonite is dehydrated and deoxidized in the presence of carbonic acid, it may give rise to chalybite.

It occurs in metalliferous veins, often in association with iron-pyrites, chalybite, blende, 'c.

It is often associated with blende and pyrites, and with calcite, fluorspar, quartz, barytes, chalybite and pearlspar as gangue minerals; in the upper oxidized parts of the deposits, cerussite and anglesite occur as alteration products.

Argillaceous brown iron ore is often known in Germany as Thoneisenstein; but the corresponding term in English (clay iron stone) is applied to nodular forms of impure chalybite.

When limonite is dehydrated and deoxidized in the presence of carbonic acid, it may give rise to chalybite.

Many deposits of limonite have been found, on being worked, to pass downwards into ferrous carbonate; and crystals of chalybite converted superficially into limonite are well known.