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pennantite

pennantite

[′pen·ən‚tīt]
(mineralogy)
Mn9 Al6Si5O20(OH)16 Orange mineral composed of basic manganese aluminum silicate; member of the chlorite group; it is isomorphous with thuringite.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive
Another very interesting mineral at Val Graveglia is goldmanite, a vanadium-bearing garnet found in places in 1988, 1992 and 1996 at the Gambatesa mine, as small (about 1 mm) but perfect green to brown-green dodecahedral crystals associated with manganaxinite, albite, calcite, pennantite, and a vanadium-rich pumpellyite (Palenzona, 1991).
Pennantite [[Mn.sup.2+].sub.5]Al([Si.sub.3]Al)[O.sub.10][(OH).sub.8]
A vanadium-bearing variety of pennantite, the so-called "grovesite" described in 1955 from the Benallt mine in Wales, has been found at the Gambatesa mine in association with manganaxinite, goldmanite, albite and calcite (Palenzona, 1991).
THE VAL GRAVEGLIA MANGANESE DISTRICT, LIGURIA, ITALY
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