http://earthwise.bgs.ac.uk/index.php?action=history&feed=atom&title=File%3AP527617.jpg 2026-04-03T23:19:11Z Revision history for this page on the wiki MediaWiki 1.42.3 http://earthwise.bgs.ac.uk/index.php?title=File:P527617.jpg&diff=31969&oldid=prev 2017-08-02T18:04:42Z

<p>User created page with UploadWizard</p> <p><b>New page</b></p><div>=={{int:filedesc}}==<br /> {{Information<br /> |description={{|1=Ruled muscovite indicates the presence of a structural defect in the crystal. It is 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. British Geological Survey Petrology Collection sample number MC 7397. 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 ruling is intimately related to the internal structure of the crystal. The specimen comes from a quartz-rich pegmatite near Dalilea, Loch Shiel. P527617.}}<br /> |date=2017-08-02 19:01:12<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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