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An English chemist reports that the South Carolina phosphate, made in factories situated in and near Charleston, ranks next in value to this Cambridge product. It contains 54 per cent. of tribasic phosphate of lime, 14 per cent. of carbonate of lime, 3-1/2 per cent. of iron oxide and alumina, 2-1/2 per cent. of fluoride of calcium, and 15 per cent. of silica.
This is what the Century says: "'It is a colorless, odorless syrup, with an intensely sour taste. It is tribasic, forming three distinct classes of metallic salts. The three atoms of hydrogen may in like manner be replaced by alcohol radicles, forming acid and neutral ethers. Phosphoric acid is used in medicine as a tonic.
An example of a tribasic acid is phosphoric acid, H PO , and here we may have three different classes of salts of three various degrees of basicity or base-saturation. We may have the first step of basicity due to combination with soda, NaH PO , or monosodium phosphate, the second step, Na HPO , or disodium phosphate, and the third, and final step, Na PO , or trisodium phosphate.
Similar coprolites are found and mined in other districts of England, but they are of inferior quality, containing more oxide of iron and alumina. These give the tribasic phosphate of lime, which results from the application of sulphuric acid to the nodules, a tendency to "go back" to the insoluble condition. French nodules are of inferior quality from another cause.
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