. Annual report of the regents of the university on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. TONITE. (Mineralogy of New-York, page 407.) The composition of this mineral as determined by Dr. R. D. Thom-son is as follows: silica 47*46; protoxide of iron 16*81; protoxide ofmanganese 10*16; alumina 6*48; lime 14*74; magnesia 2*21; wa-ter 1*24. This analysis approaches one by Bonsdorffof a black horn-blende from Nordmark and Pargas, the magnesia being replaced bymanganese in Babingtonite. Phil, Mag. 4* Ann,, xxvii., 123. ZI
. Annual report of the regents of the university on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. TONITE. (Mineralogy of New-York, page 407.) The composition of this mineral as determined by Dr. R. D. Thom-son is as follows: silica 47*46; protoxide of iron 16*81; protoxide ofmanganese 10*16; alumina 6*48; lime 14*74; magnesia 2*21; wa-ter 1*24. This analysis approaches one by Bonsdorffof a black horn-blende from Nordmark and Pargas, the magnesia being replaced bymanganese in Babingtonite. Phil, Mag. 4* Ann,, xxvii., 123. ZINC BLENDE.(Mineralogy of New-York, page 408.) The occurrence of this species in the calciferous sandrock, one or twomiles N. E. of Glens Falls, in Warren county, is mentioned by Rep, on Geol., 2d Dist., p. 180. GALENA.(Mineralogy of New-York, page 412.) Various crystalline forms of galena occurring at the Nash vein inSt. Lawrence county, are noticed by Dr. Emmons. Hep., on 2dDist., p. 356. For some remarks on the singular crystals of this mineral found atRossie, St. Lawrence county, by Mr. J. E. Teschemacher, see PhilMag. Sf Ann., xxv., p. The crystals of galena from Rossie are sometimes very singularlyconstituted. Alger introduces a figure representing a crystal of the 150 natural size in his possession. It is a flattened cube. The lateralplanes P P, as well as the replacements of the lower solid angles a,are extremely brilliant and regular; but the upper solid angles and theterminal edges, are replaced by planes, which successively rise, in astep-like manner to the apex, forming a low pyramid. See his explana-tion of the mode of formation, Phillips1 Mineralogy; Supply p. 623. WHITE LEAD ORE. (Mineralogy of New-York, page 414.) Small crystals of carbonate of lead, an eighth of an inch or less inlength, are occasionally found sprinkled thickly over the surface of thegalena of Rossie, which when this is the case is deeply roughened orcorroded. The crystal
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