This major revision takes place 38 years after the publication of the first edition. Each chapter is headed by a brief tabulation of mineral data and sketches showing optical orientation, and contains full references to the literature.

This major revision takes place 38 years after the publication of the first edition. Each chapter is headed by a brief tabulation of mineral data and sketches showing optical orientation, and contains full references to the literature.

This major revision takes place 38 years after the publication of the first edition. Each chapter is headed by a brief tabulation of mineral data and sketches showing optical orientation, and contains full references to the literature.