| Abstract: | Ten amphibole specimens from a variety of metamorphic rocks such as talc schists, eclogites, and metamorphosed iron formations contain lamellae of a second amphibole oriented parallel to (101) or (100), or both, of the host. Tremolites, actinolites, and hornblendes commonly have lamellae of a calcium-poor clinoamphibole with P21/m space-group symmetry, or lamellae of citmmingtonite with C2/m space-group symmetry. Likewise ciimmingtonites and P21/m clinoamphiboles commonly contain lamellae of calcium-rich C2/m amphiboles such as tremolite. Results of x-ray diffraction, electron-probe, and microscope studies indicate that most lamellae result from unmixing of a homogeneous amphibole. The P21/m clinoampliibole is analogous to the clinopyroxene pigeonite in agreement with the results of M. G. Bown. |
| Genre: | Article |
| ProdID: | 70011546 |
| Citation Author: | Ross, M.; Papike, J. J.; Weiblen, P. W. |
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| Citation End Page: | 1102 |
| Citation Issue: | 3819 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Exsolution in clinoamphiboles; 1968; Article; Journal; Science; Ross, M.; Papike, J. J.; Weiblen, P. W. |
| Citation Start Page: | 1099 |
| Citation Volume: | 159 |
| Citation Year: | 1968 |
| Type: | citation/reference |
| Text: | Exsolution in clinoamphiboles; 1968; Article; Journal; Science; Ross, M.; Papike, J. J.; Weiblen, P. W. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1968 00:00 -0600 |
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