http://earthwise.bgs.ac.uk/index.php?action=history&feed=atom&title=File%3AP528072.jpg 2026-04-03T21:49:02Z Revision history for this page on the wiki MediaWiki 1.42.3 http://earthwise.bgs.ac.uk/index.php?title=File:P528072.jpg&diff=31978&oldid=prev 2017-08-02T18:07:04Z

<p>User created page with UploadWizard</p> <p><b>New page</b></p><div>=={{int:filedesc}}==<br /> {{Information<br /> |description={{|1=Photograph showing grades of commercial mica, numbers 1-7 are Indian and number 8 is Brazilian. The illustration is from a publication that dealt with the features of commercial mica in Scotland that was published during the Second World War. Mica was graded on type, colour and freedom from staining. The primary division is into muscovite or white mica and phlogopite or amber mica. Muscovite is further subdivided into ruby, green and spotted types having seven, three and three clarity grades respectively. Mica was further classified by size: extra specials over 48 square inches; specials 36-48 square inches, then grades number 1 to number 7, 24-36 to less than 1 square inches respectively. During the Second World War mica was processed at the main sorting factory at Pitlochry which opened in August 1943. It had a staff of six, for the first few weeks under the direction of Mr. A.B. Mudie of the Eastern Mica Company and later under Mrs. D.G. Readdie (the wife of Mr. D.G. Readdie, of the Ministry of Supply, Mica Control department). The staff complement increased to 36 in November 1943.P528072.}}<br /> |date=2017-08-02 19:05:16<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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