New Mineral Names
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چکیده
The new mineral, the iron analogue of monticellite, occurs in melilite-nephelinite Iava from Mt. Shaheru, Belgian Congo, associated with melilite, nepheline, clinopyroxene, kalsilite, gdtzenite, combeite, sodalite, magnetite, perovskite, apatite, hornblende, biotite, and an unident i f ied mineral . Analysis gave SiO2 32.77,TiO20.23, AIzOa0.26, Fe2Oa 0.66, FeO 29 34, MnO 1.65, MgO 4.95, CaO 29.30, Na:O 0.34, KrO 0.36, PrOs 0.07, HzO+ 0.25, HzO0.06, sum 100.1816. This corresponds (in mol /) to Ca(Fe, Mg, Mn)SiOr 96.3 with Fe:Mg:Mn:69.4:22.6:4.3, Fe2SiOl 3.7. The analyzed mineral is therefore a magnesian kirschsteinite. The mineral is slightly greenish; it is colorless in thin section. G. (pycnometer) 3.434. Opt ical ly b iaxia l , negat ive, a7.689, A 1.72O,7 7.728,2Ya 5l* ; a:b, A:c, t :a. X-ray powder data, indexed from the data on fayalite, are given. The strongest lines are 2.949 (100),2.680 (85), 2.604 (80),3.658 (70), 1.839 (60). From the powder data, the unit cell has o:5.859,b:11.132,c:6.420 A,all +0.005. These were confirmed by Weissenberg and rotation photographs. Presumably the mineral is orthorhombic. The name is for the late Egon Kirschstein, German geologist, pioneer in geological exploration of North Kivu. Mrcrrtnl Fmrscnrn
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