http://earthwise.bgs.ac.uk/index.php?action=history&feed=atom&title=File%3AP527616.jpg 2026-04-03T21:49:09Z Revision history for this page on the wiki MediaWiki 1.42.3 http://earthwise.bgs.ac.uk/index.php?title=File:P527616.jpg&diff=31968&oldid=prev 2017-08-02T18:04:41Z

<p>User created page with UploadWizard</p> <p><b>New page</b></p><div>=={{int:filedesc}}==<br /> {{Information<br /> |description={{|1=A specimen of ruled silvery muscovite from the old mica trial near Austincroft Dalilea, Loch Sheil, Invernessshire. British Geological Survey Petrology Collection sample number MC 7396. Ruled or ribbon mica is a structural feature caused by a series of more or less clean sharp parting planes which cut through the crystal at an angle of approximately 67 degrees to the basal cleavage. These parting planes may extend either entirely or only part of the way across and through the crystal and their effect is to divide the mica into narrow strips or even slivers of hair-like fineness. The deposit from which this specimen was found is from one of two mica prospects, it is probably from the outcrop on the north side of Loch Sheil half a mile from Dalilea House which is noted for its silvery and heavily ruled muscovite. P527616.}}<br /> |date=2017-08-02 19:01:11<br /> |source=British Geological Survey<br /> |author=British Geological Survey<br /> |permission=<br /> |other versions=<br /> }}<br /> <br /> =={{int:license-header}}==<br /> {{subst:Custom license marker added by UW}}<br /> {{BGS}}<br /> <br /> [[Category:Uploaded with UploadWizard]]</div>

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