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On the morning of our departure we climbed a high lull of limestone, covered in places with patches of a limestone-breccia, cemented with sandstone, and filling the cavities in the rock. All over the hill we found doubly refracting Iceland-spar in quantities. Euphorbias, in Europe mere shrubs, were here smooth-limbed trees, with large flowers.
The sulphurous vapours from the water corrode the rocks near the fountains; nevertheless trees grow, without injury to their health, at a distance from them of not more than fifty feet. Besides obsidian, already mentioned as a product of its volcanoes, Iceland is famed for another mineral of great scientific value. It is that fine variety of carbonate of lime named Iceland-spar.
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