

Antwerp, New-York, USA
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Stilpnomelane, Antwerp, New-York, USA. Specimen 7x6x2.5cm covered on both sides with spherules of stilpnomelane, noted as chalcodite by Professor Chervet, now a discredited name. A rare and complex mineral, a hydroxy alumino silicate of potassium iron and manganese. Handwritten label from the Chervet collection