Optical Mineralogy ...Mineral optics. Descriptions of individual minerals. |
Common terms and phrases
a,b.-Orientation diagrams acute bisectrix Aegirine aggregates albite Andalusite anisotropic Antigorite axes axial plane balsam Barite biaxial positive Biotite Birefringence bisectrix c-axis calcite Chalcedony cleavage traces Collophane color bands Color.-Colorless colored minerals colorless Corundum cross sections crossed nicols Cummingtonite determined diopside dispersion Distinguishing Features double refraction Dumortierite Epidote euhedral crystals Extinction parallel feldspars figure is biaxial Fluorite fragments Gibbsite glass Glaucophane grains hexagonal Hornblende Hypersthene igneous rocks illustrated index ellipsoid indices of refraction interference colors isogyres isometric isotropic large axial angle length-fast length-slow Leucite light liquids metamorphic microscope Monoclinic n₁ n₂ negative nepheline normal occurs olivine opal optic axis ordinary ray orientation Orthorhombic parallel to 010 Perovskite Piedmontite plagioclase plane is 010 pleochroic polarized prism quartz quartz wedge Relief Rutile Schorlite Sillimanite slow ray Sodalite Spinel structure tetragonal thin sections tion Tourmaline triclinic Tridymite twin-plane twinning uniaxial minerals usually velocity vibrating parallel vibration directions wave пв