http://earthwise.bgs.ac.uk/index.php?action=history&feed=atom&title=File%3AP527597.jpg 2026-04-03T21:48:39Z Revision history for this page on the wiki MediaWiki 1.42.3 http://earthwise.bgs.ac.uk/index.php?title=File:P527597.jpg&diff=31956&oldid=prev 2017-08-02T18:04:24Z

<p>User created page with UploadWizard</p> <p><b>New page</b></p><div>=={{int:filedesc}}==<br /> {{Information<br /> |description={{|1=This specimen is from a muscovite mica deposit at Sguirr Marcasaidh, south of Loch Luichart, Ross and Cromarty. Mica is a hydrous potassium aluminium silicate of the monoclinic crystal system. It is soft with a hardness of 2.5 to 3 on Moh&#039;s scale of hardness. It forms tabular crystals with a psuedo-hexagonal or triangular outline. It has perfect basal cleavage which allows it to split into very fine sheets. British Geological Survey Petrology Collection sample number MC 7377. The deposit is a pegmatite body inclined to the south-east at forty-five degrees in conformity with the enclosing pelitic schists of Moine (Precambrian) age. Books of mica are less than four inches in diameter, the mica is of ruby type and flawless. It has many industrial uses though this deposit was not worked commercially. P527597.}}<br /> |date=2017-08-02 19:00:57<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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