labradorite

lab·ra·dor·ite

(lăb′rə-dôr′īt′, -dô-rīt′)

A usually brilliant blue or green variety of plagioclase feldspar that contains approximately equal proportions of sodium and calcium and occurs in silica-poor igneous rocks.

[After the Labrador (Peninsula).]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

labradorite

(ˌlæbrəˈdɔːraɪt)

(Minerals) a blue, green, or reddish-brown feldspar mineral of the plagioclase series: used as a decorative stone. Formula: CaAl2Si2O8.NaAlSi3O8

[C18: named after Labrador , where it was found; see -ite¹]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

lab•ra•dor•ite

(ˈlæb rə dɔˌraɪt)

n.

a feldspar mineral of the plagioclase group often showing a brilliant play of mostly blue and green colors.

[1805–15; after Labrador, where first discovered; see -ite ¹]

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Figure 3 also displays the main mineral phases observed in basalt rocks: Albite (NaAl[Si.sub.3][O.sub.8]), Anorthite (Ca[Al.sub.2][Si.sub.2][O.sub.8]), Augite (Na, Ca - Mg, [Fe.sup.2+], Al, [Fe.sup.3+], Ti) [[(Si, Al).sub.2][O.sub.6]] and Labradorite (Ca, Na) [Al (Al, Si) [Si.sub.2][O.sub.8]].

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