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Polyargite, specimen with a period label
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  • Polyargite, specimen with a period label
  • Polyargite, specimen with a period label
  • Polyargite, specimen with a period label

Polyargite

BP14
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Polyargite, no specific locality. In a glass tube 4 cm long and 1 cm in diameter, a fragment of polyargite, a variety of anorthite – itself a mineral of the plagioclase feldspar family, constituting the 100 per cent calcium end of the albite-anorthite series – is in fact a calcium aluminosilicate. Period label

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