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Crystal System:
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 for gemological information about Adularia.

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Classification of AdulariaHide


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

Chemical Properties of AdulariaHide


Age informationHide

Age range:
Phanerozoic : 252.7 ± 1.3 Ma to 0.7 ± 0.1 Ma - based on data given below.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
10.7 ± 0.1 MaPleistoceneAr-Ar
216.4 ± 0.4 MaMioceneK-Ar
318.3 to 15.2 MaMioceneK-Ar
428.22 ± 0.06 MaOligocene40Ar/39Ar
528.42 ± 0.04 MaOligocene40Ar/39Ar
628.78 ± 0.05 MaOligocene40Ar/39Ar
729.06 ± 0.09 MaOligocene40Ar/39Ar
829.23 ± 0.05 MaOligocene40Ar/39Ar
929.56 ± 0.06 MaOligocene40Ar/39Ar
1029.65 ± 0.05 MaOligocene40Ar/39Ar
1129.79 ± 0.05 MaOligocene40Ar/39Ar
1230.17 ± 0.22 MaOligocene40Ar/39Ar
1330.95 ± 0.05 MaOligocene40Ar/39Ar
1431.26 ± 0.05 MaOligocene40Ar/39Ar
1532.95 ± 0.05 MaOligocene40Ar/39Ar
1650.77 ± 0.84 MaEocene40Ar/39Ar
17252.7 ± 1.3 MaLopingian
Sample references:
1Mutnovsky volcano, Kamchatka Oblast', Far-Eastern Region, RussiaTakahashi, R., Matsueda, H., Okrugin, V. M., & Ono, S. (2006). Polymetallic and Au?Ag Mineralizations at the Mutnovskoe Deposit in South Kamchatka, Russia. Resource Geology, 56(2), 141-156.
2Manhattan District, Toquima Range, Nye Co., Nevada, USAShawe, D. R., Marvin, R. F., Andriessen, P. A. M., Mehnert, H. H., Merritt, V. M. (1986) Ages of Igneous and Hydrothermal Events in the Round Mountain and Manhattan Gold Districts, Nye County, Nevada. Economic Geology 81. 388-407.
3Jas Roux, La Chapelle-en-Valgaudemar, Hautes-Alpes, Provence-Alpes-Côte d'Azur, FranceGasquet D, Bertrand J, Paquette J, Lehmann J, Ratzov G, De Ascen?ão Guedes R, Tiepolo M, Boullier A, Scaillet S, Nomade S (2010) Miocene to Messinian deformation and hydrothermal activity in a pre-Alpine basement massif of the French western Alps: new U-Th-Pb and argon ages from the Lauzière massif, Bulletin de la Societe Geologique de France, 181, 227-241
4Gold Star pit, Altman, Teller Co., Colorado, USAKelley K D, Romberger S B, Beaty D W, Pontius J A, Snee L W, Stein H J, Thompson T B (1998) Geochemical and geochronological constraints on the genesis of Au-Te deposits at Cripple Creek, Colorado. Economic Geology (93) 981-1012.
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11Cresson open pit, Cripple Creek, Cripple Creek District, Teller Co., Colorado, USA  "  "
12Gold Star pit, Altman, Teller Co., Colorado, USA  "  "
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14Ocean Wave Mine, Cripple Creek District, Teller Co., Colorado, USA  "  "
15Cresson open pit, Cripple Creek, Cripple Creek District, Teller Co., Colorado, USA  "  "
16  "  "  "  "
17Don Sixto project, Agua Escondida, Malargüe department, Mendoza, ArgentinaMugas Lobos, A. C., & Márquez?Zavalía, M. F. (2013) Fluid inclusion and stable isotope studies at Don Sixto, a precious metal low sulfidation deposit in Mendoza Province, Argentina. Resource Geology, 63(4), 350-359.

Crystallography of AdulariaHide

Crystal System:

Synonyms of AdulariaHide

Other Language Names for AdulariaHide

Simplified Chinese:冰长石

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
Quartz218 photos of Adularia associated with Quartz on
Titanite173 photos of Adularia associated with Titanite on
Hematite115 photos of Adularia associated with Hematite on
Epidote89 photos of Adularia associated with Epidote on
Anatase85 photos of Adularia associated with Anatase on
Fluorite77 photos of Adularia associated with Fluorite on
Calcite62 photos of Adularia associated with Calcite on
Byssolite60 photos of Adularia associated with Byssolite on
Smoky Quartz58 photos of Adularia associated with Smoky Quartz on

Related Minerals - Nickel-Strunz GroupingHide

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.05Yoshiokaite(Ca,Na)[Al(Al,Si)O4]Trig. 3 : P3
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.30Buddingtonite(NH4)(AlSi3)O8Mon. 2 : P21
9.FA.30CelsianBa(Al2Si2O8)Mon. 2/m
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.30MonalbiteNaAlSi3O8Mon. 2/m : B2/m
9.FA.35AlbiteNa(AlSi3O8)Tric. 1
9.FA.35AnorthiteCa(Al2Si2O8)Tric. 1 : P1
9.FA.45KumdykoliteNa(AlSi3O8)Orth. mmm (2/m 2/m 2/m) : Pnnm
9.FA.65DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
9.FA.65MaleeviteBaB2Si2O8Orth. mmm (2/m 2/m 2/m) : Pnma
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

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