Crystallization of 'pocket' berthierine from the Pulsifier granitic pegmatite, Poland, Maine, USA
Wise, Michael A. (National Museum of Natural History. Smithsonian Institution. Department of Mineral Sciences)

Date:	2007
Abstract:	A new occurrence of berthierine has been found in the Pulsifer granitic pegmatite, near Auburn, Maine. Berthierine was found in miarolitic cavities ('pockets') as aggregates of radial platy crystals with albite, as fracture-fillings in microcline and as fine-grained anhedral flakes with muscovite. Berthierine samples from all associations are depleted in Mg, but show variable enrichment in Mn. The textural relationships of the berthierine assemblage indicate that its formation is probably related to the dissolution of microcline in the presence of a low-temperature, neutral to alkaline, Fe-rich hydrothermal solution. This mode of occurrence is in direct contrast to the typical formation of berthierine in granitic pegmatites that is generally related to the alteration of cordierite-group minerals.
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Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Berthierine ; Granitic Pegmatite ; Miarolitic Cavity ; Hydrothermal Fluids ; Pulsifer ; Maine
Published in:	Clays and Clay Minerals, Vol. 55, Núm. 6 (2007) , p. 583-592, ISSN 1552-8367

DOI: 10.1346/CCMN.2007.0550605

10 p, 1.1 MB  UAB restricted access

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