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Perthite

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Name:
Named for the nearby city of Perth in Ontario. The type locality is 6 miles (approx 9.5 km) southwest of Perth.
A variety of Feldspar Group

An intergrowth of albite or oligoclase with a microcline host, occasionally also with a orthoclase host. The intergrowths or exsolution lamellae of the albite are visible as white lines coursing through the K feldspar groundmass.
Common in granite pegmatites.

Originally described from North Burgess, Drummond Township, Lanark Co., Ontario, Canada.

Visit gemdat.org for gemological information about Perthite.


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Synonyms of PerthiteHide

Other Language Names for PerthiteHide

Simplified Chinese:条纹长石

Varieties of PerthiteHide

CryptoperthiteA variety of perthite with lamella of submicroscopic thickness.
MesoperthiteA perthite with approximately equal amounts of alkali feldspar and plagioclase.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Muscovite6 photos of Perthite associated with Muscovite on mindat.org.
Quartz4 photos of Perthite associated with Quartz on mindat.org.
Allanite-(Ce)4 photos of Perthite associated with Allanite-(Ce) on mindat.org.
Spessartine3 photos of Perthite associated with Spessartine on mindat.org.
Biotite2 photos of Perthite associated with Biotite on mindat.org.
Almandine2 photos of Perthite associated with Almandine on mindat.org.
Aquamarine2 photos of Perthite associated with Aquamarine on mindat.org.
Zircon1 photo of Perthite associated with Zircon on mindat.org.
Allanite1 photo of Perthite associated with Allanite on mindat.org.
Smoky Quartz1 photo of Perthite associated with Smoky Quartz on mindat.org.

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.

Perthite in petrologyHide

References for PerthiteHide

Reference List:
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Bachinski, S.W. and Müller, G. (1971) Experimental determinations of the microcline-low albite solvus. Journal of Petrology: 12: 329-356.
Brown, W.L. and Parsons, I. (1984) The nature of potasssium feldspar, exsolution microtextures and development of dislocations as a function of composition in perthitic alkali feldspars. Contributions to Mineralogy and Petrology: 86: 335-341.
Worden, R.H., Walker, F.D.L., Parsons, I., and Brown, W.L. (1990) Development of microporosity, diffusion channels and deuteric coarsening in perthitic alkali feldspars. Contributions to Mineralogy and petrology: 104: 507-515.
Waldron, K.A., Lee, M.R., and Parsons, I. (1994) The microstructure of perthitic alkali feldspars revealed by hydrofluoric acid etching. Contributions to Mineralogy and petrology: 116: 360-364.
Lee, M.R. and Parsons, I. (1995) Microtextural controls of weathering of perthitic alkali feldspars. Geochimica et Cosmochimica Acta: 59: 4465-4488.

Internet Links for PerthiteHide

Localities for PerthiteHide

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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