| Abstract: | Some aggregates of rutile, classically considered to be "elbow" twinned, instead are topotactic replacements of ilmenite or other hexagonal titaniferous precursors. Twinned rutile can be differentiated from the reticulated rutile of topotactic replacements by the angle of prism intersections, junction morphology, and the overall form of the aggregate. In a special case of topotactic replacement of ilmenite, rutile forms pseudomorphs of "trellis"-textured ilmenite lamellae in {111} of precursor magnetite. We trace the progress of rutile formation through the alteration of fine-grained magnetite-bearing host rocks. The sequential two-step topotaxy from magnetite through ilmenite to rutile requires rutile prisms to parallel the intersections of {111} planes in precursor magnetite. Some coarse reticulated rutile may result from the same paragenetic sequence. |
| Genre: | Article |
| ProdID: | 70018990 |
| Citation Author: | Force, E. R.; Richards, R. P.; Scott, K. M.; Valentine, P. C.; Fishman, N. S. |
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| Citation End Page: | 614 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Canadian Mineralogist |
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| Citation Number Of Pages: | 10 |
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| Citation Search Results Text: | Mineral intergrowths replaced by "elbow-twinned" rutile in altered rocks; 1996; Article; Journal; Canadian Mineralogist; Force, E. R.; Richards, R. P.; Scott, K. M.; Valentine, P. C.; Fishman, N. S. |
| Citation Start Page: | 605 |
| Citation Volume: | 34 |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Mineral intergrowths replaced by "elbow-twinned" rutile in altered rocks; 1996; Article; Journal; Canadian Mineralogist; Force, E. R.; Richards, R. P.; Scott, K. M.; Valentine, P. C.; Fishman, N. S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1996 00:00 -0600 |
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