Calcocita

Calcosita

Calcocita, calcosita ou calcosina é um mineral composto de sulfeto de cobre Cu2S. É opaco, com coloração variando de cinza escuro a preto e estrutura ortorrômbica.

Características

  • Fórmula Química - Cu2S
  • Composição - Sulfeto de cobre. 20,2% S, 79,8% Cu
  • Cristalografia - Ortorrômbico, Hexagonal
  • Classe - Bipiramidal-rômbica
  • Propriedades Ópticas - Anisotropia fraca, branco-azulado
  • Hábito - Pseudo-hexagonal, maçico, granular
  • Clivagem - Imperfeita {110}
  • Dureza - 2,5 - 3
  • Densidade relativa - 5,5 - 5,8
  • Fratura - Concoidal
  • Brilho - Metálico a lustroso
  • Cor - Cinza-claro

Associação

Associada a outros sulfetos, como calcopirita, bornita, enargita.

Propriedades Diagnósticas

Baixa dureza, embaçamento preto, hábito, sectibilidade, cor, brilho, cor de traço preto.

Ocorrência

Hidrotermal em veios com outros sulfetos, normalmente presente na zona de enriquecimento supérgeno de depósitos de cobre sulfetados.

Obtenção

Pode ser obtido através da ustulação do principal minério de cobre, a calcopirita ( CuFeS2).[1]

Usos

É utilizado como fonte de cobre através da sua ustulação.[1]

Referências

  1. ↑ a b CARVALHO, Geraldo Camargo de. Química Moderna, volume único. Editora Scipione (2000). Pág. 185. ISBN 85-262-3021-2

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