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GEOREF RECORD

Rediscovery of manandonite in the Sahatany Valley, Madagascar

N. Ranorosoa, F. Fontan and A. M. Fransolet
Rediscovery of manandonite in the Sahatany Valley, Madagascar
European Journal of Mineralogy (October 1989) 1 (5): 633-638

Abstract

Manandonite occurs as white flakes with a pearly lustre on the (001) cleavage, associated with elbaite and quartz lining vugs of saccharoidal albite, collected in the type locality. The mineral is optically pseudo-uniaxial to biaxial positive, the crystal often twinned on (001) as 6-fold sectors. It is a 1:1 layer silicate and can be considered as a two-layer polytype with a C- centred orthorhombic-shaped cell (a 5.057, b 8.765, c 13.769 Angstrom). A wet-chemical analysis yielded the idealized formula Li (sub 2) Al (sub 4) [(Si (sub 2) AlB)O (sub 10) ](OH) (sub 8) , with Z = 2. The thermal behaviour and the IR spectrum constitute additional features to differentiate manandonite from cookeite.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 1
Serial Issue: 5
Title: Rediscovery of manandonite in the Sahatany Valley, Madagascar
Affiliation: Serv. Geol., Tananarive, Madagascar
Pages: 633-638
Published: 198910
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 22
Accession Number: 1992-062786
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 3 tables
S25°40'00" - S11°52'00", E43°00'00" - E50°30'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1992
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