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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.


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Classification of AdulariaHide

9.FA.30

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

Chemical Properties of AdulariaHide

Formula:
KAlSi3O8

Age informationHide

Age range:
Phanerozoic : 252.7 ± 1.3 Ma to 0.7 ± 0.1 Ma - based on mindat.org data.

Crystallography of AdulariaHide

Crystal System:
Monoclinic

Synonyms of AdulariaHide

Other Language Names for AdulariaHide

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

Varieties of AdulariaHide

Barium-AdulariaFeldspar group.
ValencianiteA variety of Adularia.
Originally described from Valenciana Mine, Guanajuato, Mun. de Guanajuato, Guanajuato, Mexico.

Common AssociatesHide

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 GroupingHide

9.FA.05KaliophiliteKAlSiO4Hex.
9.FA.05KalsiliteKAlSiO4Hex. 6 2 2 : P63 2 2
9.FA.05Nepheline(Na,K)AlSiO4Hex. 6 : P63
9.FA.05Panunzite(K,Na)AlSiO4Hex. 6 : P63
9.FA.05Trikalsilite(K,Na)AlSiO4Hex.
9.FA.05Yoshiokaite(Ca,Na)[Al(Al,Si)O4]Trig. 3 : P3
9.FA.05MegakalsiliteKAlSiO4Hex.
9.FA.10MalinkoiteNaBSiO4Hex. 6 : P63
9.FA.15VirgiliteLiAlSi2O6Hex. 6 2 2 : P62 2 2
9.FA.25LisitsyniteKBSi2O6Orth. 2 2 2 : P2 2 2
9.FA.30Anorthoclase(Na,K)AlSi3O8Tric.
9.FA.30Buddingtonite(NH4)(AlSi3)O8Mon. 2 : P21
9.FA.30CelsianBa(Al2Si2O8)Mon. 2/m
9.FA.30Hyalophane(K,Ba)[Al(Si,Al)Si2O8]Mon.
9.FA.30MicroclineK(AlSi3O8)Tric. 1
9.FA.30OrthoclaseK(AlSi3O8)Mon. 2/m : B2/m
9.FA.30SanidineK(AlSi3O8)Mon. 2/m : B2/m
9.FA.30RubiclineRb(AlSi3O8)Tric.
9.FA.30MonalbiteNaAlSi3O8Mon. 2/m : B2/m
9.FA.35AlbiteNa(AlSi3O8)Tric. 1
9.FA.35Andesine(Na,Ca)[Al(Si,Al)Si2O8]Tric.
9.FA.35AnorthiteCa(Al2Si2O8)Tric. 1 : P1
9.FA.35Bytownite(Ca,Na)[Al(Al,Si)Si2O8]Tric.
9.FA.35Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35ReedmergneriteNaBSi3O8Tric.
9.FA.40ParacelsianBa(Al2Si2O8)Mon.
9.FA.45SvyatoslaviteCa(Al2Si2O8)Orth.
9.FA.45KumdykoliteNa(AlSi3O8)Orth. mmm (2/m 2/m 2/m) : Pnnm
9.FA.50SlawsoniteSr(Al2Si2O8)Mon.
9.FA.55LisetiteCaNa2Al4Si4O16Orth.
9.FA.60BanalsiteNa2BaAl4Si4O16Orth.
9.FA.60StronalsiteNa2SrAl4Si4O16Orth.
9.FA.65DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
9.FA.65MaleeviteBaB2Si2O8Orth. mmm (2/m 2/m 2/m) : Pnma
9.FA.65PekoviteSrB2Si2O8
9.FA.70Lingunite(Na,Ca)AlSi3O8Tet. 4/m : I4/m
9.FA.75KokchetaviteK(AlSi3O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm

Other InformationHide

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 AdulariaHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pini, E. (1781) Osservazioni mineralogiche sulla montagna di S. Gottardo. In: Opuscoli scelti sulle scienze e sulle arti, 4. (first description of adularia)
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.
Roth, P. (2006) The early history of tremolite. Axis: 2(3): 1-10. (referring to Pini 1781)

Internet Links for AdulariaHide

Localities for AdulariaHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow

Mineral and/or Locality  
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