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is a Potassium Aluminum Silicate with formula KALSi3O8 and hardness of 6-6.5.
Is one of the most popular and well knows in the feldspars family, it can be of various shade of colors from blue to green and from opaque to translucent and rarely transparent.Sometimes a faint sheen may be seen is some specimens. Always cut in cabochons or carving, spheres but are rarely facetted.
Size: 123x8.4x4.8 mm.