. 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. able. It is the same form as that from Ulster county, fig. 172, of myMineralogy. Some of these crystals have blades of specular iron 131 diffused through them, like the masses of anthracite found in those fromHerkimer county. Occasionally they appear almost like crystals ofspecular iron itself, but with the form of quartz. It is probably to thedisintegration of this ore that the ochery and cavernous appearance ofthese crystals
. 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. able. It is the same form as that from Ulster county, fig. 172, of myMineralogy. Some of these crystals have blades of specular iron 131 diffused through them, like the masses of anthracite found in those fromHerkimer county. Occasionally they appear almost like crystals ofspecular iron itself, but with the form of quartz. It is probably to thedisintegration of this ore that the ochery and cavernous appearance ofthese crystals is to be ascribed. The Natural bridge, in Lewis county, has furnished opaque crystalsof quartz of considerable size, and presenting some interesting modifi-cations. To those already given, I can now add that which is herefigured, and which is remarkable, as exhibiting only three According to Vanuxem, hyalite is found in the Potsdam sandstone,half a mile below Canajoharie, in Montgomery county. Report on theGeol. \th Dist., p. 29. TABULAR SPAR. (Mineralogy of New-York, page 270.) Dr. Emmons states that fine specimens of this rather rare mineral arefound in Keene, Essex county. Geology of the 2d Dist., p. 286. NEMALITE. (Mineralogy of New-York, page 272.) Prof. Connell has recently analyzed this mineral. His results arevery different from those of Dr. Thomson, but he operated upon a verysmall portion. They are as follows, viz : Magnesia, 57*86 ; protoxide ofiron, 2-84; silica, 0*80; water, 27-96; carbonic acid, 10*00; =99* supposes the formula to be, 5 Mg O, HO+Mg 0, C 02 H 0. 132 This gives: magnesia, 61*67; water, 27*24; carbonic acid, 1109;=100. It effervesces sensibly in acids, and contains only a minute quan-tity of silica. Proceedings of the British Association, for 1S46. I cannot but think that the specimen analyzed by Prof. Connell musthave been im
Size: 1175px × 2128px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorne, bookcentury1800, bookdecade1850, booksubjectscience
