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Updated: August 2, 2026
This rock may indeed be considered, in some respects, as a porphyry; for it has an evident ground, which is feld-spar, in its sparry state; and it is, in one view, distinctly maculated with quartz, which is transparent, but somewhat dark-coloured . Considered as a porphyry, this specimen is no less singular than as a granite.
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