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V.—On “Eyes” of Pyrites and other Minerals in Slate

Published online by Cambridge University Press:  01 May 2009

Alfred Harker
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Extract

Among instances of the bodily deformation of rocks by lateral pressure, the case of the phyllade aimantifère of Monthermé is well known. By its strong cleavage this rock gives evidence of considerable lateral compression. Professor Renard has shown that prior to this compression the magnetite crystals already existed in the rock, and were surrounded by a coating of chlorite. The crystals yielded to the pressure much less readily than their matrix, and the latter, having already a firm consistence, became separated from the crystals, carrying the chlorite with it, and was displaced along the planes which are now cleavage-planes, that is, in a direction at right angles to that of the pressure.

Type
Original Articles
Information
Geological Magazine , Volume 6 , Issue 9 , September 1889 , pp. 396 - 397
Copyright
Copyright © Cambridge University Press 1889

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References

page 396 note 2 Bull. Mus. Roy. Hist. Nat. Belg. vol. ii. p. 134, and plate vi. 1883.Google Scholar See also Gosselet's, “L'Ardenne,” p. 61 and fig. 17, 1888.Google Scholar

page 393 note 3 Bömmelöen og Karmöen, pp. 69, 70, 1888.Google Scholar

page 397 note 1 Jahrb. d. königl. preuss. geolog. Landes. for 1881, pp. 283–289.Google Scholar