sori

noun

1. (form-of, plural)plural of sorus
2. (historical, obsolete, uncountable)Copper sulphate, especially combined with other impurities, particularly in the context of the Roman Empire.

   “[…] copper which had contracted an efflorescence from age; the Sori was sulphate of copper combined with zinc or other impurities; and the Misy was a combination of sulphate of copper with sulphate of iron, the predominance of the[…]”

   “There is another difference in that chalcitis contains three kinds of mineral, copper, misy and sori, each of which we shall describe in its place. The approved variety of chalcitis is honey-coloured, and streaked with fine veins and is friable and not stony. It is also thought to be more useful when fresh[…]”

   “[…] copper deposits and mentions the various oxidation products including chalcitis (disintegrated and oxidized pyrite/chalcopyrite), misy (copiapite: see glossary), sori (copper sulphate + iron sulphate), melanteria (iron sulphate[…]”