Abstract
A FEW weeks ago I received a quantity of copper ores from Atacama, Chile, and on examining them was struck by the peculiar appearance of one specimen. The ground mass consisted of a kind of quartz conglomerate, containing some fissures, which were filled with a loose aggregate of minute clear and bright-green crystals. These crystals, of about one-sixteenth of an inch in length, are very thin, and belong to the monoclinic system. Some are double pyramids, others more columnar, with base, but the majority are absolutely distorted, owing to their growth being impeded by others of their kind.
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WALTHER, P. A Mineral from Copper Ore. Nature 89, 322 (1912). https://doi.org/10.1038/089322b0
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DOI: https://doi.org/10.1038/089322b0
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