Agricola, Georgius
,
De re metallica
,
1912/1950
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coloured, or any other. </
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>Sometimes quartz, schist, or marble is of this quality
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also, if much native or
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rudis
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silver adheres to it. </
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>But that ore is considered
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of poor quality if three
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librae
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of silver at the utmost are found in each
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one hundred
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lĂbrae
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of it.
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9
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Silver ore usually contains a greater quantity </
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