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On the prospecting and geology of the Kemi chromite deposit, Finland 49 SiÜ2 .. o ••• . Table 2. Chemical composition of the serpentine rock. Anal. Irja Huhta and A. Löfgren (Ni, Pt, Rh, Pd). 1000 x 0 ' 10 mol. prop. Norms . . . .. .. 37.97 633 Feü. Cr 2Ü 3 " . .. · . . . .. 1.40 Ti0 2 ... , .. .... .. .. 0.00 CaCüa . .. ... . .. · . . . .. 3.20 Al 2ü a ... , . . .. . . . . 1.68 17 H 2Ü . ... ... . .. .. . . · . 11.09 Fe 2ü a ..... . .... .. 5.78 36 ab . .. . . .. , .. , . . , .... 1. 57 Feü .. •••• 0 ••••• .. 6.15 86 an . ..... . .. . . . .... .. 3.89 Mnü .. ., ....... . , . 0.05 en ,. , . ... . ... . .. '" . 29.70 Mgü .. ..... . .. . . . . 31.14 779 hy .. . ... . ... .. · . .. .. 2.2
50 Bulletin de la Commission geologique de Finlande N: 0 194. Fig. 8. Olivine pseudomorph on base of fine-grained serpentine-tale mass. About 35 x gin of the rock can by now scarcely be detected. Nevertheless, in cases where chromite occurs as an abundant accessory of the talcose rock, these grains might form figures appearing to reflect the shapes of the primary minerals, specifically olivine (Fig. 9) . The occurrence of carbonate is closely associated with that of talc, although carbonate is also met with in small amounts in non-talcose types of rock. Carbonate occurs in conjunction with talc as either a fine-grained or coarser aggregate, as smaH roundish grains or as rather large crystals. In general, the amount of carbonate is less than that of talc. An X-ray determination of the carbonate contained in talcose rock proved it to be magnesite. PYROXENITE This rock type is not met with in the area in its original composition, either. The pyroxenitic origin of the rock has, however, been established on the basis of its mineral relicts and relict structures. In the vicinity of Elijärvi there occurs, as revealed by diamond drillings, even-grained, rather coarse (diameter of grain approx. 3 mm), greenish-gray rock, which is spread over a fairly large area. Under the micro-
Page 1 and 2: GEOLOGI NE N TUTKI MUSLAITOS BULLET
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Page 31 and 32: REFERENCES GRIFFIN, W. R. (1949) Re
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Page 67 and 68: REFERENCES BRINDLEY, G. W. and GILL
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Page 91 and 92: REFERENCES CAESAR, F. and KONOPICKY
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