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I have shown specimens of this incrustation to several geologists, and they all thought that they were of volcanic or igneous origin! In its hardness and translucency in its polish, equal to that of the finest oliva-shell in the bad smell given out, and loss of colour under the blowpipe it shows a close similarity with living sea-shells.
I have shown specimens of this incrustation to several geologists, and they all thought that they were of volcanic or igneous origin! In its hardness and translucency in its polish, equal to that of the finest oliva-shell in the bad smell given out, and loss of colour under the blowpipe it shows a close similarity with living sea-shells.
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