Congressional Edition Volume 2976
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ...green, but so dark that the green can be observed only in thin splinters; it is rarely found at the Cullakeuee mine in Clay County, but frequently met with at the Carter mine in Madison County, where it is mostly of a very dark green color. Several vari ties from the Culsagee mine have been analyzed. (I) A fine grained variety of 3-766 sp. gr., by G. A. Koenig; (II) a coarser grained variety of 3-797 sp. gr., by the same; and (III) the coarse-grained crystallized dark green, of 3-695 sp. gr., by myself. IV is an analysis of a greenish black spinel from the Carter mine, sp. gr. 3-77, made by Mr. J. S. de Benneville in my laboratory. In I, II, and III some mechanical admixtures have been deducted: Black octahedral crystals of vitreous luster from the Tibbets mine, in Macon County, are probably pleonaste. GAHNITE. Gahnite, or automolite, is mentioned by Gen. Clingman as occurring iu Cleveland County; also in Mitchell County, at the Deake mine, where it occurs in small, compact, dark green masses, in part altered into and surrounded by fibrous muscovite. I have made au examination of it and found: Copper oxide 0-30 Zinc oxido 38'05 Manganese oxide 0-29 Magnesia 0-79 Ferrous oxide 1-14 Ferric oxide 4-50 Alumina: 54-86 Sp.gr.. 4-576 MAGNETITE. This is the most abundant and most valuable iron ore in North Carolina. It occurs in small octahedral crystals in the granite at Dunn's Mountain, in Rowan, and in the granites and gneisses and (especially) the syenites very commonly in many counties, and in the slates at Fisher's Peake and Chestnut Mountain, iii Surry County; also at Bull's Head, in Alleghany County, in quartzose saudrock and hematite at Cooke's Gap, Watauga County; at Capp'sHill, in MecklenburgCouuty; Bull. 74 3 and Fisher Hill, in...
- 189 x 246 x 17mm | 553g
- 13 Sep 2013
- United States
- black & white illustrations