"sanidine." YourDictionary, n.d. Web. 06 December 2018. <https://www.yourdictionary.com/sanidine>.
sanidine. (n.d.). Retrieved December 06th, 2018, from https://www.yourdictionary.com/sanidine
(countable and uncountable, plural sanidines)
(mineralogy) A variety of orthoclasefeldspar found as tabular crystals embedded in volcanicrocks. It sometimes reflects a blue sheen along crystal planes. This phenomenon is called adularescence, and sanidine with this property is called moonstone.
English Wiktionary. Available under CC-BY-SA license.