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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).

[merged small][graphic][graphic][subsumed][subsumed][ocr errors][subsumed][merged small][merged small][graphic][graphic][subsumed][subsumed][subsumed][subsumed][ocr errors][subsumed][subsumed][subsumed][subsumed][subsumed]

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).

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