Paul F Kerr.pdf Fixed | Optical Mineralogy
Title:
The Enduring Legacy of Optical Mineralogy by Paul F. Kerr: A Cornerstone of Petrographic Education
Optical Mineralogy has its roots in the early 19th century, when mineralogists began using optical instruments to study the properties of minerals. The field gained significant momentum in the late 19th and early 20th centuries, with the development of more sophisticated optical instruments and techniques. Paul F. Kerr, an American mineralogist, was a prominent figure in the field during the mid-20th century. Optical Mineralogy Paul F Kerr.pdf
Optical Mineralogy is a branch of mineralogy that deals with the study of minerals using optical techniques. Paul F. Kerr, a renowned American mineralogist, wrote an influential book on the subject, which has become a classic in the field. The book, likely titled "Optical Mineralogy" or "The Microscopic Identification of Minerals" (Kerr's most notable work), provides a detailed guide on the identification and characterization of minerals using optical properties. Title: The Enduring Legacy of Optical Mineralogy by Paul F
Microscopic Preparation:
Includes practical instructions on creating mineral chips and thin sections (typically 0.03 mm thick) for microscopic examination. Nesse (Modern): Excellent for quantitative data (RI exact
Kerr's book emphasizes the importance of proper techniques and instrumentation in optical mineralogy. He discusses:
The heart of Kerr’s contribution lies in his systematic approach to mineral identification. Before the advent of digital databases, the determinative table was the petrologist’s most valuable asset. Kerr organized minerals based on their optical properties in a logical, ascending order—typically by refractive index or birefringence.
3. The Determinative Tables
- Nesse (Modern): Excellent for quantitative data (RI exact values). Less narrative.
- Kerr (Classic): Superior for diagnostic morphology. Kerr describes how a mineral looks and behaves (e.g., "Zoisite often appears dirty" or "Staurolite twins like a Roman sword"). Modern texts sanitize this descriptive language.
- Digital Apps: Apps can calculate 2V angles instantly, but they cannot teach you the hand-eye coordination of rotating the stage. Kerr’s PDF forces you to think through the process.