GEL 2130 Study Guide - Final Guide: Basalt, Monoclinic Crystal System, Birefringence

• School: Wayne State University
• Department: Geology
• Course: GEL 2130
• Professor: Brown Lee

Document Summary

Lo bm micro fightphenomena involve bothparticle and wave behavior. Everything we encounterwithcrystals and themicroscope is explainedby wavetheory. Double refraction unpolarized money vibrates in all directions. A interaction w light velocityof lightin a vacuum velocityoflightin a mineral. Refractive index r d isdirectly related todensityof a mineral. Snell"s law and the o ray righthe light striking the surface ofthe material shouldgo straight through withoutdeviating. Opticalindicatrix lmaginary 3 d surface inside a crystal where axial lengths are proportional to the refractiveindex in thatdirection. Extraordinaryray ie ray a mineral at rightangles thelightshouldgothrough withoutdeviating thesame distance in the same time vibrates in thebasalplane and travels. Epsilon e vibrator in theplanethatincludes the c axis and travelsdifferentdistances in an equivalenttime depending ontheorientationof theincidentbeam. Birefringence the differencebetween refractive indices of a mineral thedifference between the expressednumerically. O and erays thisproperty is only visiblefrom anisotropic minerals thegreater thedifference between velocityof theoand erays themore intense interference colors mlference colors.