A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Perthitic intergrowth |
|---|---|
| Description | Perthite is a series of layers that occur as intergrowths in alkali feldspars that form at high temperatures and cool slowly, unmixing as they cool. Perthite is actually two minerals: an intergrowth of sodic plagioclase in K-feldspar (orthoclase or microcline). The intergrowths are commonly stringy, but they may be globular, lensoid, or other shapes. |
| Photographer | Shannon Heinle. 2002-09-19. |
| Collection | University of North Dakota Mineralogy Collection #139. |
| Key words | perthite, feldspars, intergrowth |
| Tech details | 237 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 2937 |
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