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Ramanite-(Cs) and ramanite-(Rb): New cesium and rubidium pentaborate tetrahydrate minerals identified with Raman spectroscopy by R. Thomas; P. Davidson; A. Hahn is a Earth and Planetary Sciences article available to read on EtoBox.

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This study of melt and fluid inclusions in graphic pegmatite quartz from the Island of Elba, Italy has identified silicate melts and coexisting aqueous fluid from the final stage of pegmatite formation, which contain extremely high concentrations of boron (up to 19.8 mass% B 2 O 3 ), cesium (>5 mass% Cs 2 O), and rubidium (>0.5 mass% Rb 2 O). Several boron-bearing minerals have been identified in melt and fluid inclusions, including sassolite (H 3 BO 3 ) and santite (KB 5 O 8 •4H 2 O). In addition, we have found two new minerals observed as daughter mineral phases, and these have been accepted by the IMA, Commission on New Minerals, Nomenclature and Classification (CNMNC) as ramanite-(Cs) (2007-007), monoclinic β-cesium pentaborate tetrahydrate (CsB 5 O 8 •4H 2 O) with space group C2/c, and ramanite-(Rb) (2007-006), orthorhombic rubidium pentaborate tetrahydrate (RbB 5 O 8 •4H 2 O) with space group Aba2. At the moment, given sample constraints, we cannot directly determine some of the properties traditionally reported for new minerals; however, both phases have Raman spectra identical to spectra obtained on synthetic Cs and Rb pentaborates, which were studied for comparison. Althou

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Author

R. Thomas; P. Davidson; A. Hahn

Publisher

Mineralogical Society of America

Published

2008

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)