A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Perthite |
|---|---|
| Description | Perthite is the name given intimate intermixtures of a potassium feldspar, either microcline or orthoclase, and the sodium-rich plagioclase feldspar, albite, with potassium feldspar the predominant constituent. The main chemical formula for perthite is (K,Na)AlSi3O8. Perthite is formed when the cooling of K-feldspar causes exsolution of sodium- and potassium-rich feldspar. |
| Photographer | Shannon Heinle. 2002-09-19. |
| Collection | University of North Dakota Mineralogy Collection. |
| Key words | perthite, feldspar |
| Tech details | 602 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 2947 |
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