turgite

turgite

(ˈtɜːdʒaɪt)
n
(Minerals) a red or black mineral consisting of hydrated ferric oxide. Formula: Fe2O3.nH2O
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References in periodicals archive ?
The thin film of aluminum phosphate on foliated, specular hematite is quite different from the iridescent hematite, variety turgite, found at Graves Mountain, Georgia, and Covington, Virginia.
This is really a finely botryoidal goethite coated with hematite, and certainly the merest sideshow to the rutiles, but the iridescence can be quite colorful, and yes, I'm afraid that "cute" is the word for these little turgite Aladdin's Cave pickings.