GEOL 2540 Lecture Notes - Lecture 9: Sapphire, Plagioclase, Photon

• School: University of Manitoba
• Department: Geological Sciences
• Course: GEOL 2540
• Professor: Chakhmouradian Anton

Document Summary

Refraction, dispersion, luster and diaphaneity n = cvac/vmin vac / min. Index of refraction (n) nair sin = nmin sin snell"slaw nair sin nmin sin snells law airair mineral . Luster manner in which light is reflected by the fresh surface of a mineral by the fresh surface of a mineral. R= reflectivity (n + 1)2 + n 2k 2 n= refraction index i d f i k= absorption coefficient. Causes of color in minerals: chromophore elements. Calcite w ith minor concentrations of mn2+ or co2+ in caco3. Calcite w ith minor concentrations of mn in caco3 or co. Fe- ti bearing blue corundum (sapphire) corundum (sapphire) Ti4: electron and hole color centers color centers. Electron color centers in purple fluorite p p. Hole color centers in brow n ( smoky) quartz. Pleochroism e c n n a b r o s b. Cordierite, ( mg fe) al si o ( mg,fe) 2al2si5o18.