Andesine



a mineral, intermediate in the plagioclase feldspar group, having a play of colors and usually found as crystals in igneous rocks.
Historical Examples

These intermediate members are the lime-soda felspars known as oligoclase, andesine, labradorite and bytownite.
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 Various

noun
a feldspar mineral of the plagioclase series consisting of an aluminium silicate of sodium and calcium. Formula: NaAlSi3O8.CaAl2Si2O8
andesine
(ān’də-zēn’)
A white, gray, green or yellow mineral of the plagioclase feldspar group. Andesine occurs in igneous rocks such as andesite and diorite. Chemical formula: (Na,Ca)(Si,Al)4O8.

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  • Andesite

    a dark-colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite. Historical Examples M. Dubois discovered these remains in the island of Java in andesite tufa of Pliocene or at least early Pleistocene age. The Cambridge Natural History, Vol X., Mammalia Frank Evers Beddard Surface eruption of […]

  • Andesitic

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