249
Geologic features 251

BISMUTH ORES 252
Economic features 252
Geologic features 252

CADMIUM ORES 253
Economic features 253
Geologic features 254

COBALT ORES 254
Economic features 254
Geologic features 255

MERCURY (QUICKSILVER) ORES 255
Economic features 255
Geologic features 258

TIN ORES 260
Economic features 260
Geologic features 261

URANIUM AND RADIUM ORES 263
Economic features 263
Geologic features 264

CHAPTER XIII. MISCELLANEOUS NON-METALLIC MINERALS 267

NATURAL ABRASIVES 267
Economic features 267
Geologic features 269

ASBESTOS 270
Economic features 270
Geologic features 271

BARITE (BARYTES) 272
Economic features 272
Geologic features 273

BORAX 274
Economic features 274
Geologic features 275

BROMINE 277
Economic features