Crystals are found as a rarity in the amygdaloidal cavities of igneous rocks. [Please select]
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There was no outlet, for it was a _cul-de-sac_--a natural court--such as are often found among the amygdaloidal mountains of Mexico. [Please select]
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It was one of those mountain torrents common in Mexico--spots of still water alternating with cascades, that dash, and foam over shapeless masses of amygdaloidal basalt. [Please select]
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