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hyalophane
Hyalophane or jaloallofane is a crystalline mineral, part of the feldspar group of tectosilicates. It is considered a barium-rich potassium feldspar. Its chemical formula is (K,Ba)(Al(Si,Al)Si2O8), and it has a hardness of 6 - 6½. The name hyalophane comes from the Greek hyalos, meaning "glass", and phanos meaning "to appear".
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- John Wiley
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