seybertite

seybertite

[′sī·bər‚dīt]
(mineralogy)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Familiar names associated with the collection include Lewis & Clark, Adam Seybert, Gerard Troost (troostite), Isaac Lea, Henry Seybert (seybertite; son of Adam and discoverer of fluorine and beryllium), Henry Darwin Rogers (first state geologist), Lewis White Williams (williamsite, since discredited as antigorite), Charles Moore Wheatley (owner of the Wheatley mine), William S.
Ambiguities in nomenclature have historically arisen in the classification of the trioctahedral brittle micas: seybertite, valuevite, brandisite, holmite, xanthophyllite and others have all been used in the past to denote separate mica species.