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 277
Geologic features 278

FULLER'S EARTH 278
Economic features 278
Geologic features 279

GRAPHITE (PLUMBAGO) 279
Economic features 279
Geologic features 282

GYPSUM 283
Economic features 283
Geologic features 284

MICA 285
Economic features 285
Geologic features 287

MONAZITE (THORIUM AND CERIUM ORES) 288
Economic features 288
Geologic features 289

PRECIOUS STONES 289
Economic features 289
Geologic features 291

SALT 294
Economic features 294
Geologic features 295

TALC AND SOAPSTONE 299
Economic features 299
Geologic features 299