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As to the size of a pyritous mass necessary to produce in this manner a large nugget, it is by no means considerable.
From Getting Gold: a practical treatise for prospectors, miners and students by J. C. F. (Joseph Colin Frances) Johnson
But this is the case; we find those fissures filled both with calcareous, gypseous, and pyritous substances.
From Theory of the Earth, Volume 1 (of 4) by James Hutton
Alum is manufactured from the pyritous shales of the Mianwálí district, the annual output being generally about 200 to 300 tons.
From The Panjab, North-West Frontier Province, and Kashmir by Sir James McCrone Douie
After visiting the pyritous marls of the Rio Juagua, we continued following the course of the crevice, which stretches along like a narrow canal overshadowed by very lofty trees.
From Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 by Thomasina Ross
Fossil wood with Teredo antenautæ is also met with, and pyritous casts of univalve and bivalve shells.
From Journal of the Proceedings of the Linnean Society - Vol. 3 Zoology by Various
