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A 37

v.73

EARTH SCIENCES LIBRARY

EXCHANGE

CONTENTS.

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LIST OF PLATES, VOLUME 73. .

PLATE 1.-Fig. 1.-Aravalli schist country, south-west of Kundanpur, Jhabua

State.
FIG. 2.-View of Aravalli quartzite country, N.E. of Virpur, Balasinor

State.
PLATE 2.–Fig. 1.-Deccan trap country, Samoi, Jhabua.
Fig. 2.-General view of Aravalli quartzite ridges, Umria, Bariya

State.
PLATE 3.-Fig. 1.--Aravalli quartzite (dip-slope), Hadaph river-section, Umria,

Bariya State.
Fig. 2.-Low-dipping Aravalli slaty and quartzitic bands, south of

Mekhar, Godhra.
PLATE 4.--Fig. 1.-Much jointed Aravalli quartzite, Edalwara, Bariya State.

FIG. 2.-Weathering of granite, Kothamba, Lunavada State. PLATE 5.-Geological map of Gujarat and Southern Rajputana. PLATE 6.-Fig. 1. -Cassiterite (C) interstitial to wolfram (W). Quartz (Q).

P. S. 252. X 54. Fig. 2.-Cassiteritic (C) and molybdenite (M) interstitial to wolfram (W). Bakelite (B). P. S. 251. Crossed nicols.

X 54. Fig. 3.--Wolfram (W) partly enclosing a tourmaline crystal (T) in

quartz (Q). P. S. 243. X.54. Fig. 4.-Schcelite (dark grey), replacing wolfram (light grey). P. S.

231. PLATE 7.–Fig. 1.-Wolfram (W) crystal replaced by schcelite (S). Cassiterite

(C) and quartz (Q). Bakelite (B). P. S. 251. Fig. 2.-Quartz (Q) replacing wolfram (W). A little pyrite (P). P. S. 236.

x 54. FIG. 3.-Pyrite (white) veinlets in quartz (Q) and wolfram (W). P. S.

232 X 54. Fig. 4.--Pyrite (P) veining tourmaline (T), and both replaced and veined by chlorite (C). P. S. 239 B.

X 54.
PLATE 8.-Fig. 1.-Pyrite (P) and chalcopyrite (C), veining arsenopyrite (A).
Quartz (Q). P. S. 164.

X 28.
FIG. 2.--Arsenopyrite (white) veined by chalcopyrite (grey) and

carbonate (black). P. S. 164. X 180.
Fig. 3.- Arsenopyrite needles in chlorite (dark grey); the latter

replaces quartz (lighter grey) and galena (white). Pyrite

(P). P. S. 236. X 54. Fig. 4.--Sphalerite (S) veining and replacing arsenopyrite (A). Also

chalcopyrite (C) and carbonate (Ca). P. S. 242.

54.

X 28.

X 84,

PLATE 9.--Fig. 1.-Quartz veins in sphalerite. P. S. 173.

x 40. FIG. 2.–Starnite (S) and galena (G) which veined stannite but is

altered in part to cerussite (Ce). Wolfram (W). P. S.

166. Oil immersion. X 420. Fig. 3.-- Molybdenite flake (M) in bismuthinite (B) and quartz (Q),

the bismuthinite replacing the quartz along the molybde-
nite. Note the strong difference in reflectivity between
adjacent areas of bismuthinite. P. S. 175.

X 54.
Fig. 4.-Intergrowth of bismuthinite in galena. Crossed nicols. P. S.

235. X 54. PLATE 10.-Fig. 1.-Galena vein (white) in cassiterite (C). Quartz (Q). P. S.

235.

X 180.
FIG. 2.-Chalcopyrite (C) partly altered to chalcocite and covellite,

and stannite (S) vein along cleavage in galena. P. S. 166.

x 235.
Fig. 3.-Zoning in cassiterite (thin section). Mic. slide 24690.

X 24.
Fig. 4.--Tourmaline (T) replaced by muscovite (MI) and chlorite (Ch)

in cassiterite (C) and wolfram (W). Mic. slide 21681.

x 24. PLATE 11.–Fig. 1.—Cassiterite replaced by interstitial felspar. Mic. slide 24680.

X 24.
Fig. 2.-Cassiterite replaced and veined by beryl. Mic. slide 24687.

X 24.
Fig. 3.-Beryl replaced along its cleavage, at walls of scheelite vein.

Mic, slide 24685. x 24.
Fig. 4.-Scheelite replacing platy carbonate. Mic. slide 21653.

X 24.
PLATE 12.--Fig. 1.--Mica veins (M) in cassiterite (C). Note how one of them

stops at the border of scheelite (S) after wolfram, and its position in the latter occupied by clear scheelite. Tour

maline (T). Mic. slide 24688. x 24.
Fig. 2.- Tourmaline (T) and cassiterite (C) veined by lepidolite (M).

Mic. slide 24698. X 24.
Fig. 3.-Relic quartz in platy carbonate. Mic, slide 24090.

x 24. Fig. 4.–Platy carbonate. Mic. slide 24696.

x 24. PLATE 13.–Fig. 1.-Wolfram veining muscovite (M) which appears also to be

interstitial to coarser wolfram (W). Quartz (Q). P. S.

268. X 54. Fig. 2.-Wolfram (light grey) brecciated and veined by quartz

(dark grey). P. S. 268. X 54. FIG. 3.-Cassiterite (dark grey) replaced by wolfram (grey). Quartz vein to left. P. S. 266.

X 54.
FIG. 4.-Cassiterite (white) veined and replaced by quartz (grey).
P. S. 265.

x 54, PLATE 14.-Fig. 1.-Fluorite (F) replacing quartz (Q). Wolfram (W) and

tungstite (T). Cracks in fluorite, infilled with bakelite, appear like quartz. P. S. 267. X 54.

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