. "Chrysocolla"@en . . "Chrysocolla is a hydrated copper phyllosilicate mineral with formula: Cu2-xAlx(H2-xSi2O5)(OH)4\u00B7nH2O (x<1) or (Cu,Al)2H2Si2O5(OH)4\u00B7nH2O. The structure of the mineral has been questioned, as spectrographic studies suggest material identified as chrysocolla may be a mixture of the copper hydroxide spertiniite and chalcedony."@en . .