Minerals and Metals in Ancient India v2.c47.60

v2.c47.60

*Aventurine feldspar* is a variety of albite with reddish reflection from certain planes due to thin lamellae of hematite. *Perthite* is a flesh-red aventurine feldspar consisting of inter-laminated orthoclase and albite. *Microcline-perthite* is a similar interlamination of microcline and albite. When the structure is discernible only with the help of the microscope, it is called *microperthite*.