An Introduction to the Practical Study of Crystals, Minerals and Rocks |
Contents
CrystallographyIntroduction | 1 |
The stereographic projection | 16 |
Determination of crystal morphology | 28 |
Copyright | |
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Common terms and phrases
90 degrees albite alkali feldspar allochemical amphiboles angular augite axial ratios axis basal pinacoid biotite birefringence c-axis calcite carbonate centre chalcopyrite clasts cleavage trace Colour-colourless common commonly constituents Crossed nicols crystal system crystallographic axes Crystallography cube cubic system diad diorites Distinguishing features elongated extinction angle face-pole faces facies feldspathoids fine-grained gabbro garnet granites grey hand-specimens hexagonal hornblende igneous rocks illustrated in Fig interfacial angles leucite limestones Lustre magma metamorphic rocks micas microscope mineral assemblages mineral grains mineralogy monoclinic nepheline normal Occurrence octahedron olivine opaque orientation orthoclase orthorhombic parametral plane pelitic phenocrysts plagioclase Plane polarized light pleochroism polarization colours position primitive circle prism prismatic pyramidal pyroxene quartz refractive indices regional metamorphism relief rotation schistosity schists sedimentary rocks sediments silicates small circle specimen stereogram straight extinction structure syenites symmetry plane temperature termed terrigenous tetragonal texture thin sections tion transparent triclinic trigonal twinning usually vibration direction volcanic zone