In the production of pyrite, which is found in Louisa county and is used for the manufacture of sulphuric acid employed in the treatment of wood pulp for paper-making and in the manufacture of superphosphates from phosphate rock, Virginia took first rank in 1902 with an output valued at $501,642, or 64.7% of the total yield of this mineral in the United States; and this rank was maintained in 1908, when the product was 116,340 long tons, valued at $435,522.
The chief exports are stone for road-making, butter, eggs and vegetables; the chief imports are coal, timber, superphosphates and wine from Algeria.
By the late 1800s, superphosphates were all the rage and eighty factories were manufacturing this high-yield fertilizer from coprolites (that is, phosphate-rich fossils of ancient animal dung—I kid you not).
How would you define superphosphates? Add your definition here.