Agricola, Georgius, De re metallica, 1912/1950

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        <body>
          <chap>
            <pb pagenum="115"/>
            <p type="main">
              <s>As regards other kinds of metal, although some rich ores are found,
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              still, unless the veins contain a large quantity of ore, it is very rarely worth
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              while to dig them. </s>
              <s>The Indians and some other races do search for gems in
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              veins hidden deep in the earth, but more often they are noticed from their
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              clearness, or rather their brilliancy, when metals are mined. </s>
              <s>When they
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              outcrop, we follow veins of marble by mining in the same way as is
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              done with rock or building-stones when we come upon them. </s>
              <s>But
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              gems, properly so called, though they sometimes have veins of their own,
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              are still for the most part found in mines and rock quarries, as the
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              lodestone in iron mines, the emery in silver mines, the
                <emph type="italics"/>
              lapís judaícus,
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              trochítes,
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              and the like in stone quarries where the diggers, at the bidding
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              of the owners, usually collect them from the seams in the rocks.
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              10
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              Nor does the
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              miner neglect the digging of “extraordinary earths,”
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              11
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              whether they are found
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              </s>
            </p>
          </chap>
        </body>
      </text>
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