Agricola, Georgius
,
De re metallica
,
1912/1950
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<
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>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. </
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<
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>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. </
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<
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>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. </
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<
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
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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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