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

1860–65; named after Andes; see -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
andesine (ˈændɪˌziːn, -zɪn)
a feldspar mineral of the plagioclase series consisting of an aluminium silicate of sodium and calcium. Formula: NaAlSi3O8.CaAl2Si2O8
[C19: from the Andes (where it is found) + -ine1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
andesine   (ān'də-zēn')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Sodic andesine crystals commonly broken and with faint euhedral oscillatory zoning.
Most crystals are andesine, but the composition ranges from oligoclase to labradorite.
Most of the plagioclase is oligoclase, but sodic andesine is present in a few specimens.
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