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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.]


(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]


(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]
References in periodicals archive ?
Strong quartz alunite adularia open space was found associated with another coincident mag low and potassium high in the northern portion of the property.
Hydrothermal eruption breccias, sinter overlying zeolytic tuffs and hydrothermal adularia in permeable fault zones are indicators of hydrothermal activity that may have formed zeolites, as suggested by Brathwaite (2006).
The person who he's seeing the future for has to hold Adularia until it warms up.
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.