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hystatite, n.

Frequency (in current use):?
Origin: A borrowing from German. Etymon: German Hystatit.
Etymology: < German Hystatit ( F. von Kobell Grundzüge d. Mineral. (1838) 318); earlier called hystatisches Eisenerz ? (Breithaupt, 1828) < ancient Greek ?στατο? ? lowest, superlative form corresponding to ?στερο? ? low (see hystero- comb. form1) + German -it ?-ite suffix1, perhaps so called because its rhombohedral form shows the most obtuse angle in a group of iron-ore minerals.
Mineralogy. Now historical and rare.

? A black mineral containing titanium and iron, later identified as a variety or impure form of ilmenite.

1844?? F. Alger Phillips's Elem. Treat. Mineral. (ed. 5) 379?? Hystatite..consists of titanic acid 43:24, protoxide of iron 27.91, peroxide of iron 2866.
1857?? J. D. Dana Man. Mineral. (new ed.) 241?? The hystatite variety [of titanic iron] includes the washingtonite variety of Professor Shepard.
1998?? Scripta Geologica 118 13?? Hystatite, a species described from Arendal by Breithaupt.., is a mixture of ilmenite with hematite and/or magnetite.

1844—1998(Hide quotations)


This entry has been updated (OED Third Edition, June 2020).