Orthoclase, an alkali feldspar, happens in a variety of colours, the most typical being colourless. Adularia, a colourless, transparent variety from Adular-Bergstock in Switzerland, includes a bluish white “schiller” or sheen, called adularescence.
Orthoclase feldspar happens in intrusive igneous rocks and is among the main constituents of granitic pegmatites. It's also present in metamorphic rocks for example schist and gneiss. Clear, colourless orthoclase happens in Madagascar. Yellow and colourless cuttable material, cat’s-eyes, plus some star stones occur within the gem gravels of Sri Lanka and Burma.
Feldspars are the most typical rock-forming minerals in the Earth’s surface. They're dicvided into two groups: the alkali feldspars and also the plagioclase feldspars. Orthoclase derives its name in the Greek for “break straight”, a reference towards the stone’s perfect cleavage at near 90 degrees.
White Orthoclase Feldspar
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