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Adularia

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Formula:
KAlSi3O8
Crystal System:
Monoclinic
Name:
Named in 1780 by Ermenegildo Pini for the type locality, the Adula Massif (part of the Gotthard massif), Switzerland.
A variety of K Feldspar

A more ordered low-temperature variety of Orthoclase or partially disordered Microcline. Individual localities should be verified because the adularia structural state is nearly equally represented by microcline and orthoclase specimens. Generally found in alpine-type parageneses.

Originally described from the Adula Massif, Ticino (Tessin), Switzerland.

Visit gemdat.org for gemological information about Adularia.


Classification of Adularia

9.FA.30

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions

Chemical Properties of Adularia

Formula:
KAlSi3O8

Crystallography of Adularia

Crystal System:
Monoclinic

Synonyms of Adularia

Other Language Names for Adularia

Anglo-Saxon:Adularia
Finnish:Adulaari
French:Adulaire
Italian:Adularia
Polish:Adular
Simplified Chinese:冰长石
Ukrainian:Адуляр

Varieties of Adularia

Barium-Adularia

Feldspar group.

Originally reported from Isagosawa mine, Morioka, Iwate Prefecture, Tohoku Region, Honshu Island, Japan.

Valencianite

A variety of Adularia.
Originally described from Valenciana Mine, Guanajuato, Mun. de Guanajuato, Guanajuato, Mexico.

In a study on the order/disorder relationships among K-feldspars of K-rich feldspar, Sánchez-Muñoz (2013) suggest that valencianite ...

Common Associates

Associated Minerals Based on Photo Data:
Chlorite Group271 photos of Adularia associated with Chlorite Group on mindat.org.
Quartz218 photos of Adularia associated with Quartz on mindat.org.
Titanite173 photos of Adularia associated with Titanite on mindat.org.
Hematite115 photos of Adularia associated with Hematite on mindat.org.
Epidote89 photos of Adularia associated with Epidote on mindat.org.
Anatase85 photos of Adularia associated with Anatase on mindat.org.
Fluorite77 photos of Adularia associated with Fluorite on mindat.org.
Calcite62 photos of Adularia associated with Calcite on mindat.org.
Byssolite60 photos of Adularia associated with Byssolite on mindat.org.
Smoky Quartz58 photos of Adularia associated with Smoky Quartz on mindat.org.

Related Minerals - Nickel-Strunz Grouping

9.FA.05KaliophiliteKAlSiO4
9.FA.05KalsiliteKAlSiO4
9.FA.05Nepheline(Na,K)AlSiO4
9.FA.05Panunzite(K,Na)AlSiO4
9.FA.05Trikalsilite(K,Na)AlSiO4
9.FA.05Yoshiokaite(Ca,Na)[Al(Al,Si)O4]
9.FA.05MegakalsiliteKAlSiO4
9.FA.10MalinkoiteNaBSiO4
9.FA.15VirgiliteLiAlSi2O6
9.FA.25LisitsyniteKBSi2O6
9.FA.30Anorthoclase(Na,K)AlSi3O8
9.FA.30Buddingtonite(NH4)(AlSi3)O8
9.FA.30CelsianBa(Al2Si2O8)
9.FA.30Hyalophane(K,Ba)[Al(Si,Al)Si2O8]
9.FA.30MicroclineK(AlSi3O8)
9.FA.30OrthoclaseK(AlSi3O8)
9.FA.30SanidineK(AlSi3O8)
9.FA.30RubiclineRb(AlSi3O8)
9.FA.30MonalbiteNaAlSi3O8
9.FA.35AlbiteNa(AlSi3O8)
9.FA.35Andesine(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35AnorthiteCa(Al2Si2O8)
9.FA.35Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35ReedmergneriteNaBSi3O8
9.FA.40ParacelsianBa(Al2Si2O8)
9.FA.45SvyatoslaviteCa(Al2Si2O8)
9.FA.45KumdykoliteNa(AlSi3O8)
9.FA.50SlawsoniteSr(Al2Si2O8)
9.FA.55LisetiteCaNa2Al4Si4O16
9.FA.60BanalsiteNa2BaAl4Si4O16
9.FA.60StronalsiteNa2SrAl4Si4O16
9.FA.65DanburiteCaB2Si2O8
9.FA.65MaleeviteBaB2Si2O8
9.FA.65PekoviteSrB2Si2O8
9.FA.70Lingunite(Na,Ca)AlSi3O8
9.FA.75KokchetaviteK(AlSi3O8)

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Adularia

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Dal Negro, A., De Pieri, R., Quareni, S., Taylor, W.H. (1978) The crystal structures of nine K feldspars from the Adamello Massif (Northern Italy). Acta Crystallographica: B34: 2699-2707.

Internet Links for Adularia

mindat.org URL:
https://www.mindat.org/min-28.html
Please feel free to link to this page.
Specimens:
The following Adularia specimens are currently listed for sale on minfind.com.

Localities for Adularia

Mineral and/or Locality  
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