Definition of sanidine in English:

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Pronunciation: /ˈsanəˌdēn/


A glassy mineral of the alkali feldspar group, typically occurring as tabular crystals.
Example sentences
  • At temperatures above about 660°C complete solid solution occurs between the two alkali feldspar end-members sanidine and high albite, but below this there is a break and two feldspars of different composition occur together.
  • The majority of the rhyolites are porphyritic and contain phenocrysts of one or more of the following: plagioclase, clinopyroxene, magnetite, quartz and sanidine, plus accessory apatite and zircon.
  • Closer to the contact microcline is replaced by sanidine, and perthitic exsolution in detrital alkali feldspar begins to disappear.


Early 19th century: from Greek sanis, sanid- 'board' + -ine4.

For editors and proofreaders

Syllabification: san·i·dine

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