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Updated: May 17, 2025
Copper pyrites, by its aspect from the other minerals, and from iron pyrites by its inferior hardness and less gravity. Stilbite is characterized by its form, difficult gelatinizing, and intumescence before the blowpipe; from natrolite as mentioned under that species. Laumonite is known by its generally chalky appearance and a probable failure in finding it.
Total and sudden transformations of a language seldom happen; conquests and migrations are now very rare: but there are other causes of change, which, though slow in their operation, and invisible in their progress, are perhaps as much superior to human resistance, as the revolutions of the sky, or intumescence of the tide.
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