Here the detailing was fine and at the corners inlaid with an intarsia of different obsidians polished smooth. |
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The mammoth fossil from 500 thousand years ago, mollusk fossils, plant fossils and obsidians are included in this part. |
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Yin includes 416 quartz snow of California and Yang of 252 black obsidians of Mexico. |
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The continental geology offered a diverse range of industrial stone including fine-grained argillites and basalts, flints, cherts, obsidians and nephrite. |
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