metavoltine

metavoltine

[¦med·ə′vōl‚tēn]
(mineralogy)
A yellowish-brown or orange-brown to greenish-brown, hexagonal mineral consisting of a hydrated basic sulfate of iron and potassium; occurs in tabular form or as aggregates.
References in periodicals archive ?
The deposit has produced an attractive suite of colorful, well-crystallized, hydrous sulfates including coquimbite, halotrichite, krausite, metavoltine, potassium alum, quenstedtite, r^merite and voltaite.
Several blue and orange-colored sulfates have not been positively identified but probably include romerite, voltaite, metavoltine and chalcanthite.
Excellent voltaite, metavoltine, melanterite, copiapite and halotrichite, have been found at outcrops of pyritic Chattanooga Shale in Kentucky and at roadcuts exposing pyritic coal beds in Kentucky, Tennessee, and Pennsylvania (e.