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Perthite

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


An intergrowth of albite or other plagioclase and orthoclase or microcline. The intergrowths or exsolution lamellae are visible as white lines coursing through the K feldspar groundmass.
Common in pegmatites.
Originally described from North Burgess, Drummond Township, Lanark Co., Ontario, Canada.

Classification of Perthite

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Other Names for Perthite

Synonyms:
Anperthite
Other Languages:
German:Anperthit
Perthit
Spanish:Anperthita
Perthita
Varieties:
Cryptoperthite

Other Information

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

References for Perthite

Reference List: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 Perthite

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    Localities for Perthite

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