Sombrerite
Sombrerit was a geologically young formed on coral rich limestone , by the leachate and the overlying guano partially metamorphosed was next and calcium carbonate and clay 75 to 90 percent phosphate of lime ( calcium phosphate contained). The substance was described as dense and horn-like with a specific gravity of 2.52. Variants from white to red-gray were given as the color.
He was found on Sombrero Island in the Lesser Antilles between the Virgin Islands and Anguilla . Since it was easy to pulverize, American companies exploited the deposits from 1856 to 1890 and put the sombrerite on the market as a fertilizer in order to revive agriculture in the devastated southern states . As a result, the deposit seemed to have been quickly exhausted. Sombrerite was thus the most rapidly exploited guanophosphate.
Individual evidence
- ↑ Tuisko von Lorey / Christof Wagner: Handbuch der Forstwissenschaft , Tübingen 1912/13., P. 195.
- ↑ Pisani: About the Esmarkit of Bräkke in Norway; in: E. Schweizerbart et al. (Ed.): New year book for mineralogy, geology and palaeontology, Stuttgart 1925, p. 471; Phipson: About the Sombrerit, Journal für Praktisches Chemie, 1863, Vol. 87, p. 124; Ferdinand Zirkel: Textbook of Petrography, Leipzig 1893/94, p. 532.
- ↑ Gustav von Tschermak: Textbook of Mineralogy, Vienna a. a. 1905, p. 603.
- ^ Adolf Miethe: The technology in the twentieth century, Braunschweig 1911, p. 332.