. Bulletin of the British Museum (Natural History), Mineralogy. 13 16 19 AI2O3 160- 120 80 40 y ^ 40 50 60 70 § Sal/c LHI. 20 30 40 50 6'0 7j Thornton-Tuttle Index Weight percentage of oxide. 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 British Museum (Natural History). London : BM(NH)

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