Tags: Chemical Substance, Mineral.
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 (KBa)[Al(SiAl)Si2O8] and it has a hardness of 6 – 6½. The name hyalophane comes from the Greek hyalos meaning glass and phanos meaning to appear.An occurrence of hyalophane was discovered in 1855 in Lengenbach Quarry Imfield in the municipality of Binn Switzerland.
