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CARACTERÍSTICAS MINERALÓGICAS E CRISTALOGRÁFICAS DA GIPSITA DO ARARIPE

Authors: Oliveira, Felisbela Maria da Costa; Borges, Lucila Ester Prado; Melo, Evenildo Bezerra de; Barros, Márcio Luiz Siqueira Campos;

CARACTERÍSTICAS MINERALÓGICAS E CRISTALOGRÁFICAS DA GIPSITA DO ARARIPE

Abstract

A gipsita é um sulfato de cálcio di-hidratado e tem o seu principal campo de aplicação industrial a partir da sua transformação para gesso. No Araripe, as minas apresentam diferentes tipos de minério que submetidos a processos de calcinação diferenciados produzem gesso de qualidade diferenciada. Foram descritas macroscopicamente amostras dos seguintes minérios: a) tipo “rapadura;” b) tipo “cocadinha; c) tipo “Johnson”; d) tipo “estrelinha”; e) o alabastro; f) a selenita, além da anidrita. Apresentam-se, neste trabalho, os resultados das investigações em amostras de alguns dos tipos de minérios conhecidos, utilizando-se a Difração de Raios-X na expectativa de melhor compreendê-los, visto que atualmente são diferenciados por aspectos meramente morfológicos. Foram realizadas análises difratométricas em amostras dos tipos Jonhson, Rapadura/Cocadinha e Estrelinha. A análise desses difratogramas diagnostica um material puro, bem cristalizado, identificando como única impureza a presença, embora em pequena quantidade, de anidrita nos três tipos estudados. Ainda é possível afirmar que o teor de anidrita é maior no tipo estratificado, seguido pelo tipo estrelinha e no tipo mais nobre - gipsita tipo Jonhson -, embora com concentração de anidrita nos seus nódulos de coloração cinza azulado, fora dos quais ocorre o menor teor entre os três tipos estudados.

Keywords

A, General Works

  • BIP!
    Impact byBIP!
    selected citations
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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    5
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
5
Average
Top 10%
Average
Green
gold