microtektite

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A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England

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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

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A human Inuit skull in a stone chambered cairn in Ilulissat in Greenland. These ancient graves are pre christian and are at least 2000

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microtektite

geology

Learn about this topic in these articles:

composition of tektites

In tektite
Microtektites of millimetre and smaller size, first discovered in 1968, exhibit wider variation in composition than the large tektites; e.g., their silica content can be as low as 50 percent, similar to that of terrestrial basalts. Microtektites have been found so far only in deep-sea…
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natural glasses

In industrial glass: Natural glasses
…land in Australasia and associated microtektites from the bottom of the Indian Ocean, moldavites from central Europe, and Libyan Desert glass from western Egypt. Owing to their extremely high chemical durability under the sea, microtektite compositions are of significant commercial interest for hazardous waste immobilization or conversion.
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