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.
Hematite, in the form of iridescent botryoidal "turgite," is common as thin crusts on silicified dacite on the upper slopes.
Further, Dale had a swarm of loose, thumbnail-sized stalagmites - or pillars, or candledripping-columns, or dead tree trunks - of "turgite," all showing a vivid, many-hued iridescence on their brown skins.