Vermiculite
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In 1913, vermiculite was discovered in Libby, Montana, US. Commercial mining operations commenced in 1923 and at its peak, the mine produced upwards of 200,000 tons each year. The particular type of vermiculite produced at Libby was found to contain secondary minerals called asbestiform amphibole fibres, comprising predominantly actinolite, tremolite and...Explore the subscription options here to get full access to isurv, including downloads.
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