Potassium rhodizonate is used to stain this substance in the Bailey-Stevens test, which distinguishes it from other optically similar minerals in metamorphic rocks.
Potassium rhodizonate is used to stain this substance in the Bailey-Stevens test, which distinguishes it from other optically similar minerals in metamorphic rocks. The optical boundary between this mineral and sanidine is set at a 2V-sub-x or 40 degrees, and its optical plane is perpendicular to the 010 face. The Stewart and Wright equation can be used to calculate the proportion of it by volume versus that of its sodium-containing counterpart. Intermediates between that counterpart, albite, and this mineral are known as microperthites, and frequently occur with it in syenite and granite deposits.  FTP, name this optically monoclinic potasium-containing alkali feldspar that takes its name from the Greek for "straight fracture."
Potassium rhodizonate is used to stain this substance in the Bailey-Stevens test, which distinguishes it from other optically similar minerals in metamorphic rocks.
{orthoclase} (prompt on {"potassium aluminosilicate"} or {"potassium feldspar"} before they are mentioned)