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Fort Point, Fairhaven, Bristol Co., Massachusetts, USA
© 2010 Peter Cristofono
|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 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. Currently in public beta-test.
Classification of Perthite
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Other Names for Perthite
|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
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
Localities for Perthite
The 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.