Petrology for Students An Introduction to the Study of Rocks Under the Micros
Petrology for Students An Introduction to the Study of Rocks Under the Micros
Alfred Harker
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J. S. (1885) xli, 401-407. Teall, PI. V. Fig. 2. 3 Cross, Proc. Colo. Sci. Soc. (1887) 242-244. 4 Manbhum in India ; see Holland, Rec. Geol. Sur. Ind. (1894) xxvii, 142 : Kilimanjaro; see Hatch, G. M. , 1888, 257-260. 5 Watts, Sep. Brit. Ass. For 1893, 767 ; Guide, 35. 6 Judd, Q. G. J. S. (1885) xli, 389-395. 7 Proc. U. S. Nat. Mus. (1888) xi, 192-195. S Ibid. (1894) xvii, 651, 652. 92 ENSTATITE-PERIDOTITES. A well-known enstatite- augite-peridotite occurs in the Pyre- nees and Ariege (Lherz ty...pe) 1 . About two-thirds of the rock consists of fresh olivine, the other minerals being a colourless enstatite, a faint green to colourless chrome-bearing diopside, and irregular grains of either brown picotite or green pleo- naste. As usual in types very rich in olivine, the structure is granular, not poecilitic. Such rocks, often serpentinized, are recorded from several other districts. A porphyritic bronzite- diallage-peridotite occurs in Maryland 2, and a similar rock in Colusa County, California 8 .
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