Sanidine meaning

săn'ĭ-dēn', -dĭn
A yellow to white, glassy monoclinic mineral of the potassium feldspar group that forms from relatively high-temperature magmas.
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(mineralogy) A variety of orthoclase feldspar found as tabular crystals embedded in volcanic rocks. It sometimes reflects a blue sheen along crystal planes. This phenomenon is called adularescence, and sanidine with this property is called moonstone.
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Origin of sanidine

Greek sanis sanid- board (from its flat crystals) –ine