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Mineralogical Classificationkalungaite from Brazil
26th Jan 2006 17:00 UTCDaniel Atencio
GEOLOGIA
Composição de grãos tem paládio, arsênio e selênio
Cientistas de BrasÃlia descobrem a kalungaÃta, novo mineral, em GO
REINALDO JOSÉ LOPES
DA REPORTAGEM LOCAL
Uma mina de ouro que funciona desde o século 18 perto de Cavalcante, em Goiás, acaba de revelar outra preciosidade inesperada: um novo mineral, batizado de kalungaÃta por pesquisadores da UnB (Universidade de BrasÃlia).
De brilho cinza-chumbo e composta por paládio, arsênio e selênio, a kalungaÃta aparece na forma de pequenos grãos com 0,2 mm de diâmetro associados a uma massa de outros minerais, explica Nilson Francisquini Botelho, geólogo da UnB que coordena o estudo. A posição de novo mineral entre os cerca de 4.000 já conhecidos foi homologada pela IMA (Associação Internacional de Mineralogia, na sigla inglesa), porque tanto a composição quÃmica quanto a estrutura cristalina (microscópica) do material foram consideradas inéditas.
"Estávamos fazendo um trabalho geral de mapeamento geológico por lá. Mas alguns dados anteriores da mina já indicavam a presença de coisas que não estavam bem identificadas", conta Botelho. A descoberta pode ser importante para a viabilidade econômica da mina no futuro, porque o mineral é relativamente abundante e a presença do paládio sugere usos na indústria de catalisadores para carros e na fabricação de circuitos eletrônicos.
O nome do mineral "é uma singela homenagem ao povo kalunga", descendentes de escravos africanos que, ironicamente, fugiram da antiga mina, diz o geólogo. Ele já batizou outro mineral, a yanomamita, como homenagem aos ianomâmis -o mineral é rico no elemento quÃmico Ãndio.
26th Jan 2006 17:22 UTCMarco E. Ciriotti Manager
Thanks Daniel.
Ciao. Marco
The structure of the synthetic analogue in:
• Foecker, A.J. & Jeitschko, W. (2001): The atomic order of the pnictogen and chalcogen stoms in equiatomic ternary compounds TPnCh (T=Ni, Pd; Pn=P, As, Sb; Ch=S, Se, Te). Journal of Solid State Chemistry, 162, 69-78.
30th Jan 2006 12:13 UTCPeter Haas
Kalungaite updated.
30th Jan 2006 12:47 UTCMarco E. Ciriotti Manager
Ciao.
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 25, 2024 08:43:52