. Carnegie Institution of Washington publication. . PLATE XXI NATURAL ALBITE AFTER THIRTY-FIVE MINUTES' EXPOSURE AT 1206°. MELTED PORTIONS ARE DARK. (37^ X 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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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1905