Agricola, Georgius, De re metallica, 1912/1950

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              rudis
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              6
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              , of yellowish green, yellow, purple, black, or outside red and inside
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              gold colour. </s>
              <s>These must be reckoned as the richest ores, because the gold
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              exceeds the stone or earth in weight. </s>
              <s>Next come all gold ores of which each.
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              <s>one hundred
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              librae
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              contains more than three
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              uncĂ­ae
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              of gold
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              7
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              ; for although but
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              a small proportion of gold is found in the earth or stone, yet it equals in value
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              other metals of greater weight.
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              8
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              All other gold ores are considered poor, because
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