IPv6 Intelligence

Optical Mineralogy Paul F Kerr.pdf Jun 2026

“That’s not in the fourth edition,” he said. “That’s a typo they never corrected. It’s a rare, iron-rich variety of cordierite. They call it ‘sekaninaite.’ The fourth edition mislabels it as ‘altered olivine.’”

Provides a systematic catalog of minerals, detailing their optical properties—such as color in thin section, relief , cleavage, and birefringence—to aid in identification. Key Features and Content Optical Mineralogy Paul F Kerr.pdf

Detailed breakdown

“An interstitial phase in 15475. Purple interference, parallel extinction, negative elongation.” “That’s not in the fourth edition,” he said