. Transactions. Fig. 7.—Ore from Surface, Diopside Altered to Serpentine,24 Diameters ; Polarized Light ; Crossed Nicols. ActualField, 3 Fig. 8.—Lean Ore, Pyroxene Zone of Dike, 9 Diameter? ; OrdinaryLight. Actual Field, 8 mm. A TITANIFEROUS IRON-ORE DEPOSIT. 21 I. Pal „ „. „, „ == = = Class II. Fem ,2 = = Class II. F \ 7 ^ , . = = > = Order 5 Q 0 / 1 -\ 7~/ 1 = Order 5 Na,0K,0 93 ^ „^ t, o— ^ = = = Rang 3 CaO 96 9594 = Rang 3 jv,u ^^ ^QQQ_ gubrang 3Na,0 56 4055 = = = Subrang The magmatic symbol for both rocks is: II. 5. ,
. Transactions. Fig. 7.—Ore from Surface, Diopside Altered to Serpentine,24 Diameters ; Polarized Light ; Crossed Nicols. ActualField, 3 Fig. 8.—Lean Ore, Pyroxene Zone of Dike, 9 Diameter? ; OrdinaryLight. Actual Field, 8 mm. A TITANIFEROUS IRON-ORE DEPOSIT. 21 I. Pal „ „. „, „ == = = Class II. Fem ,2 = = Class II. F \ 7 ^ , . = = > = Order 5 Q 0 / 1 -\ 7~/ 1 = Order 5 Na,0K,0 93 ^ „^ t, o— ^ = = = Rang 3 CaO 96 9594 = Rang 3 jv,u ^^ ^QQQ_ gubrang 3Na,0 56 4055 = = = Subrang The magmatic symbol for both rocks is: II. 5. , orShoshonose, by the chemical classification. I would classifythe rock as an orthoclase-biotite gabbro in preference to call-ing it a monzonite, on account of the predominance of the plagioclase. The Iron-Ores. The principal ore-deposit is a pyroxene-magnetite-biotitedike, 250 ft. wide, in which the minerals are very unequallydistributed, the magnetite being largely concentrated in the cen-tral portions, while the biotite is confined to a zone near the walls. The order of distribution from the walls to the center is:25 f
Size: 1583px × 1577px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
