How To Use Natural glass In A Sentence

• The new arrivals include the ‘golden felspar’, natural glass and fibrolite from Tanzania.
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• The aggregates of globular bodies seen in the section so greatly resemble the globulites of slags and natural glasses, and in their arrangement so forcibly recall the structures seen in the well known pitchstone of Scientific American Supplement, No. 595, May 28, 1887
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