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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 for gemological information about Perthite.

Synonyms of Perthite

Other Language Names for Perthite

Simplified Chinese:条纹长石

Varieties of Perthite


A variety of perthite with lamella of submicroscopic thickness.


A perthite with approximately equal amounts of alkali feldspar and plagioclase.

Common Associates

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

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.

Perthite in petrology

An essential component of (items highlighted in red)
Common component of (items highlighted in red)

References for Perthite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 URL:
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Localities for Perthite

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