piemontite


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piemontite

[′pē‚män‚tīt]
(mineralogy)
Ca2(Al,Mn3-,Fe)3Si3O12(OH) Reddish-brown epidote mineral that contains manganese. Also known as manganese epidote; piedmontite.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Piemontite [Ca.sub.2][(Al,[Mn.sup.3+],[Fe.sup.3+]).sub.3][([SiO.sub.4]).sub.3](O H)
Piemontite, a manganiferous member of the epidote group, is common as tiny prismatic crystals and crystal sprays in small amounts in the quartz veins, sometimes in association with barite and tinzenite.
Notable quartz specimens from the Gambatesa and Molinello mines show inclusions of sursassite, copper and piemontite (Antofilli et al., 1983).
Occurrence: In manganese ore consisting of braunite, rhodonite, spessartine, tinzenite, parsettensite, sursassite and strontian piemontite in radiolarites.