Perthite
A variety of Feldspar Group
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About 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 oligoclase with a microcline host, occasionally also with an 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.
See also microperthite.
Originally described from North Burgess, Drummond Township, Lanark Co., Ontario, Canada.
Visit gemdat.org for gemological information about Perthite.
Common in granite pegmatites.
See also microperthite.
Originally described from North Burgess, Drummond Township, Lanark Co., Ontario, Canada.
Visit gemdat.org for gemological information about Perthite.Unique Identifiers
Mindat ID:
6683 (as Perthite)
1624 (as Feldspar Group)
1624 (as Feldspar Group)
Long-form identifier:
mindat:1:1:6683:5 (as Perthite)
mindat:1:1:1624:3 (as Feldspar Group)
mindat:1:1:1624:3 (as Feldspar Group)
Synonyms of Perthite
Other Language Names for Perthite
Varieties of Perthite
| Cryptoperthite | A variety of perthite with lamella of submicroscopic thickness. |
| Mesoperthite | A perthite with approximately equal amounts of alkali feldspar and plagioclase. |
Common Associates
Associated Minerals Based on Photo Data:
| 6 photos of Perthite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
| 5 photos of Perthite associated with Microcline | K(AlSi3O8) |
| 4 photos of Perthite associated with Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 4 photos of Perthite associated with Quartz | SiO2 |
| 4 photos of Perthite associated with Albite | Na(AlSi3O8) |
| 3 photos of Perthite associated with Spessartine | Mn2+3Al2(SiO4)3 |
| 3 photos of Perthite associated with Lepidolite | |
| 2 photos of Perthite associated with Aquamarine | Be3Al2Si6O18 |
| 2 photos of Perthite associated with Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| 2 photos of Perthite associated with Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
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 rock names highlighted in red, an accessory component in rock names highlighted in green.
Internet Links for Perthite
mindat.org URL:
https://www.mindat.org/min-6683.html
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Please feel free to link to this page.
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References for Perthite
Reference List:
Localities for Perthite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Fort Point, Fairhaven, Bristol County, Massachusetts, USA