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... of the cause of the Colors in Precious Opal
Journal of the Franklin Institute, of the State of Pennsylvania, for the Promotion of the Mechanic Arts; Devoted to Mechanical and Physical Science, Civil Engineering, the Arts and Manufactures, and the Recording of American and Other Patent Inventions (1828-1851); Philadelphia Vol. 10, Iss. 3, (Sep 1, 1845): 195.