G. S. 1., Calcutta. FIG. 4. INTERGROWTH OF BISMUTHINITE IN GALENA. CROSSED NICOLS. (x 54). 1. d. Dunn, Photomicros. FIG. 3. MOLYBDENITE FLAKE (M) IN BISMUTHINITE (B) AND QUARTZ (Q), THE BISMUTHINITE REPLACING THE QUARTZ ALONG THE MOLYBDENITE. NOTE THE STRONG DIFFERENCE IN REFLECTIVITY BETWEEN ADJACENT AREAS OF BISMUTHINITE. (x 54). 1. Dunn, Photomicros. FIG. 3. ZONING IN CASSITERITE (THIN SECTION). (X 24). G. S. 1., Calcutta. FIG. 4. TOURMALINE (T) REPLACED BY MUSCOVITE (M) AND CHLORITE (Ch) IN CASSITER ITE (C) AND WOLFRAM (W). (x 24). |