. Carnegie Institution of Washington publication. . 10. 11. Fig. 10.—Albite crystal embedded in charge of powdered albite glass. Fig. 11.—Same after heating. element as indicated in fig. 10. This charge was heated slowly to exactly 12000, slowly cooled again, and several thin sections prepared from the crystal fragment and its immediate neighborhood. What the microscope showed can best be seen from the accompanying illustrations (Plate XX)—groups of crystal fragments of microscopic size, preserving their original orientation (extinction) perfectlv, but with narrow lanes of glass where cleavage
. Carnegie Institution of Washington publication. . 10. 11. Fig. 10.—Albite crystal embedded in charge of powdered albite glass. Fig. 11.—Same after heating. element as indicated in fig. 10. This charge was heated slowly to exactly 12000, slowly cooled again, and several thin sections prepared from the crystal fragment and its immediate neighborhood. What the microscope showed can best be seen from the accompanying illustrations (Plate XX)—groups of crystal fragments of microscopic size, preserving their original orientation (extinction) perfectlv, but with narrow lanes of glass where cleavage and other cracks had been, forming a perfect network without a trace of disarrangement. Con- siderable melting had taken place but no flow. Neither had the charge as a wrhole made any movement to take the form of the con- taining vessel after sintering together (fig. 11).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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