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Published in:
1996 | OriginalPaper | Chapter
The history of glass
Author : Heinz G. Pfaender
Published in: Schott Guide to Glass
Publisher: Springer Netherlands
Included in: Professional Book Archive
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‘Natural glass’ is produced whenever glass-forming rocks melt under high temperature and then solidify quickly. This happens when volcanoes erupt, when lightning strikes into quartz iferous sand or when meteorites hit the surface of the earth. During the stone age, humans used cutting tools made of natural glass of volcanic origin, known as absidian and tektities.