blakeite

blakeite

[′blā‚kīt]
(mineralogy)
A deep reddish-brown to deep brown mineral consisting of anhydrous ferric tellurite; occurs in massive form, as microcrystalline crusts.
References in periodicals archive ?
Fred also wrote hundreds of popular magazine articles, and numerous articles in technical mineralogy journals; he published the first descriptions of the new minerals brazilianite, mackayite and blakeite.