A hydrous silicate of iron of somewhat uncertain composition.

An iron silicate mineral later identified with cronstedtite.

A hydrous silicate of iron often occurring in grains.

A hydrous silicate of ferric iron, found in amorphous black masses. Cf. hisingerite, n.

An iron silicate mineral occurring in fibrous or feathery forms and subsequently shown to be a pseudomorph of quartz and goethite after cummingtonite.

Mineralogy. A red iron-rich silicate mineral of uncertain identity, perhaps a pseudomorph after olivine. Now rare or disused.