Home > American Minerals II – April 7 > MS1558 Ilvaite

Ilvaite


Ilavite is a calcium iron soro-silicate hydroxide. The mineral name comes from Ilva, the Latin name for Elba Island, site of the type locality (Steffens, 1811). Ilvaite contains iron in two valence states, Fe2+ and Fe3+; the mineral strongly absorbs visible light as electrons jump between the differently charged iron atoms; this so called electronic charge transfer renders ilvaite black. Takéuchi et al. (1983) found some ilvaite samples are orthorhombic while others are monoclinic.

This specimen consists of a single crystal of ilvaite, 2.2 by 2.1 by 2.2 cm, with a sidecar. This is a nice example from a defunct American locality. Attached are radiating hedenbergite and an unidentified tan coating.

Price: $50

Item code: MS1558

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