Agricola, Georgius - De re metallica

Agricola, Georgius, De re metallica, 1912/1950

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1coloured, or any other. Sometimes quartz, schist, or marble is of this quality
also, if much native or rudis silver adheres to it. But that ore is considered
of poor quality if three librae of silver at the utmost are found in each
one hundred líbrae of it.9 Silver ore usually contains a greater quantity

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