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RELATIONS BETWEEN INVERTED FE-RICH PIGEONITE,PRIMARY ORTHOPYROXENE AND CA-PYROXENE IN THERMALLY METAMORPHOSED IRON FORMATION,MINNESOTA.(ABSTRACT).BONNICHSEN B.1968; GEOL. SOC. AMER., ABSTR. PROGRAMS; USA; 1968(11), P. 32 A 33Miscellaneous
