Mineral intergrowths replaced by "elbow-twinned" rutile in altered rocks
Canadian Mineralogist
By: E. R. Force, R. P. Richards, K. M. Scott, P. C. Valentine, and N.S. Fishman
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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.
Suggested Citation
Force, E.R., Richards, R.P., Scott, K.M., Valentine, P.C., Fishman, N., 1996, Mineral intergrowths replaced by "elbow-twinned" rutile in altered rocks: Canadian Mineralogist, v. 34, no. 3, p. 605-614.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Mineral intergrowths replaced by "elbow-twinned" rutile in altered rocks |
| Series title | Canadian Mineralogist |
| Volume | 34 |
| Issue | 3 |
| Year Published | 1996 |
| Language | English |
| Contributing office(s) | Woods Hole Coastal and Marine Science Center |
| Description | 10 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Canadian Mineralogist |
| First page | 605 |
| Last page | 614 |