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 (ăj′ə-lâr′ē-ə, -lăr′-)
A colorless to milky white mineral of the potassium feldspar group that forms from relatively low-temperature magmas and lacks structural homogeneity.

[Italian, from French adulaire, after Adula, a mountain group of southeast Switzerland.]
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.


(Minerals) a white or colourless glassy variety of orthoclase in the form of prismatic crystals. It occurs in metamorphic rocks and is a minor gemstone. Formula: KAlSi3O8
[C18: via Italian from French adulaire, after Adula, a group of mountains in Switzerland]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌædʒ əˈlɛər i ə)

n., pl. -lar•i•as.
a sometimes opalescent variety of orthoclase formed at a low temperature.
[1790–1800; < Italian < French adulaire, after Adula a mountain group in Switzerland; see -ary]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Veins comprise white chalcedonic quartz and minor adularia with dark grey banding due to the inclusion of silver sulphides and gold.
Feeding potential in the lecithotrophic larvae of Adularia proxima and Tritonia hombergi: an evolutionary perspective.
Un tercer tipo de veta observado en el lugar, aunque de menor desarrollo, esta compuesto por cristales de silice y adularia generando un bandeamiento caracteristico.
Precip 4 4.6 Boiler Origin Adularia Hematite type Of ash KAl[Si.sub.3][O.sub.8] [Fe.sub.2][O.sub.3] weight % Balti Power Plant PF Superheater 6.2 3.5 Economizer 8.4 3.2 El.
Adularia is a stone that's yellow and almost translucent since you can see through it.
A geological tourist in Brimfield - Dana specifies the "road leading to Warren" - might happen upon some lovely iolite, or traces of adularia, mica or garnet.
Specular hematite, albite, adularia, and quartz fill voids and form veins, and also occur as granulated fragments in the groundmass.