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GEOREF RECORD

Moraesite from the Humaita tourmaline mine, Minas Gerais, Brazil

Jacques P. Cassedanne and Jeannine O. Cassedanne
La moraesite de la mine de tourmaline de Humaita, Minas Gerais, Bresil
The Canadian Mineralogist (September 1987) 25, Part 3: 419-424

Abstract

Moraesite occurs as a coating in pockets of the Humaita granite pegmatite, which is worked for gem-tourmaline, near the Jequitinhonha River in the northern part of Minas Gerais, Brazil. Its powder-diffraction data, chemical composition, and refractive indices are compared with those of moraesite from the type locality, the Supucaia mine in the same state, and the latter two with moraesite from a number of other localities. Wet-chemical analysis, XRD data, thermal analyses (DTA and TGA), and its IR absorption spectrum indicate that an appropriate formula is (Be (sub 1.594) Ca (sub 0.286) Mn (sub 0.092) Fe (sub 0.028) ) (sub 3.5) (PO (sub 4) ) (sub 2) (OH) (sub 0.8) .7H (sub 2) O rather than that originally proposed by Lindberg et al.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 25, Part 3
Title: La moraesite de la mine de tourmaline de Humaita, Minas Gerais, Bresil
Translated Title: Moraesite from the Humaita tourmaline mine, Minas Gerais, Brazil
Affiliation: Univ. Fed. Rio de Janeiro, Inst. Geocienc., Rio de Janeiro, Brazil
Pages: 419-424
Published: 198709
Text Language: French
Summary Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 22
Accession Number: 1988-009196
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch map
S23°30'00" - S14°00'00", W51°00'00" - W39°45'00"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1988
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