INDEX.
Reading edition
MINERAL NAMES IN HEAVY-FACED TYPE.
Abbreviations, ix
Abnormal interference colors, 30
Absorption, 26 directions, 26 tints, 17
Acmite, 83
Actinolite, 84
Acute bisectrix, 5
Ægirine, 83
Ægirine-augite, 84
Aggregate structure, 38
Albite, 103
Allanite, 96
Allotriomorphic, 15
Aluminium, test for, by Borichy’s method, 137 test for, by Behren’s method, 139
Amorphous bodies, 2
Amorphous substances, test for, 26
Amphibole, 84
Analcite, 56
Analyzer, 10
Andalusite, 72
Anhedron, 15
Anisotropic character, test for, 27
Anisotropic crystals, 2
Anomalies, optical, 27
Anorthite, 103
Anorthoclase, 113
Anthophyllite, 88
Antigorite, 114
Apatite, 68
Apatite, recognition of, by test for phosphorus, 139
Apparatus for petrographical laboratory, 127
Appendix, 141
Arfvedsonite, 88
Augite, 80
Automorphic, 13
Axes of elasticity, 4
Axial angle, 5 determination of, 47
Axial plane, 5
Basaltic Hornblende, 85
Bastite, 77
Becke’s method for determining relative values of refractive indices, 19
Behren’s method. (Hydrofluoric and sulphuric acids), 137
Bertrand lens, 11
Biaxial crystals, 4, 5 vibration directions in, 4
Biaxial interference figures, 43
Biotite, 89
Bisectrix, acute, 5 obtuse, 5
Borichy’s method. (Hydrofluosilicic acid), 135
Broken or strained crystals, 15
Bronzite, 76
Calcite, 65
Calcium, test for, by Borichy’s method, 136 test for, by Behren’s method, 138
“Cap” nicol, 10
Carbonaceous Matter, 61
Carbonaceous particles, test for, 132
Carbonates, test for, 130
Cement, 122 for mounting, 126
Cementing, 121
Centering stage, 10
Chalcedony, 64
Characters observed by, convergent light, 40 crossed nicols, 26 reflected light, 13 polarized light, 25
Characters of opaque minerals, 13 transparent minerals, 13
Chemical and mechanical tests, 129
Chemical (micro) reactions, 134 separation, 134 tests on crystal in section, 129
Chiastolite, 72
Chlorite group, 92
Chromite, 52
150Chrysolite, 77
Chrysotile, 114
Circular polarization, 3
Classification into systems by optical determinations, 141
Clay, 115
Cleaning and finishing sections, 126
Cleaning microscope, 11
Cleavage, 23
Clinozoisite, 96
Color, 17 diagram (interference), 143 fringes, 48
Condensing lens, 9
Consolidation of minerals in plutonic rocks, order of, 144
Conventions, ix
Convergent light, 40 characters observed by, 40
Convergent and parallel light, résumé of uses of, 49
Cordierite, 78
Corroded crystals, 15
Corundum, 62
Crossed nicols, characters observed by, 26
Crossed twinning, 37
Crystallites, 16
Crystallizations obtained by Behren’s method, 137 Borichy’s method, 135
Crystals bounded by planes, 13
Crystals without bounding planes, 15
Cutting, 120
Cutting and grinding machines, 117
Cyanite, 113
Damourite, 92
Delessite, 94
Diagram, showing relation between strength of double refraction, interference colors and thickness of section, 143
Diallage, 80
Diamond saws, 119
Dichroite, 78
Diopside, 80
Dipyre, 59
Directions of elasticity, ix
Dispersion, 5, 48
Disthene, 113
Dolomite, 67
Double image, 2
Double refraction, 2, 27 estimation of strength of, 30 strength of, measured by von Federow mica wedge, 35 table (maximum), 142
Effects produced by crystals on transmitted light, 2
Elæolite, 69
Elasticity, axes of, 4 directions of, ix
Electric motor for grinding machines, 117
Electro-magnetic separation, 134
Emery, grades of, for grinding, 124
Enstatite, 75
Epidote, 94
Etched figures, 130
Extinction, 31 angles, 5, 31 tests for, 32 wavy, 31
Extraordinary ray, 3
Eye-pieces, 11
Faster and slower rays, test for vibration directions of, 33
Fayalite, 78
Feldspar Group, 98
Feldspathoids, 69
Fibrolite, 73
Finishing and cleaning sections, 126
Focusing, 11
Form of crystals, 13
Fracture, 24
Garnet, 53
Gelatinizing silica, test for, 130
Glass slides, 125
Glaucophane, 88
Graphite, 61
Gravity (specific) separation, 133
Gridiron twinning, 37
Grinding, 123
Grinding and cutting machines, 117 apparatus for sections with parallel faces, 118 plates or laps, 121
Gypsum, 80
Gypsum test-plate, 33
151Hardness of grains, 132
Haüyne, 56
Haüynite, 56
Haüynite and noselite, micro-chemical distinction between, 139
Heating sections to redness, 131
Heavy solutions, 133
Hematite, 61
Hexagonal crystals, 4
High relief, 17
Hornblende, 84
Hyalosiderite, 78
Hydrargillite, 115
Hydrofluosilicic acid test, 135
Hypersthene, 75
Idiomorphic, 13
Idocrase, 60
Ilmenite, 62
Inclusions, 24
Index of refraction, ix, 17 by Becke’s method, 19 by Schrœder van der Kolk’s method, 22 by Sorby’s method, 19
Indicators for specific gravity separation, 133
Indices of refraction (mean), table of, 142
Interference color, determination of order of, 35
Interference colors, 28
Interference colors (abnormal), 30
Interference figures, 40 biaxial, 43 uniaxial, 40
Investigation of microscopic and optical characters of minerals, 13
Iolite, 78
Iron, test for, by Borichy’s method, 137 test for, by Behren’s method, 139
Isolating crystals or mineral fragments for testing, 132
Isometric crystals, 2
Isotropic character, 26, 40 crystals, 2
Kaolin, 115
Labradorite, 103
Laps for grinding, 121
Leucite, 54
Leucoxene, 62
Light, ordinary, 1 plane polarized, 1
Limonite, 51
Lithia Mica, 92
Machines for cutting and grinding, 117
Magnesium, test for, by Borichy’s method, 137 test for, by Behren’s method, 138
Magnetic iron ore, 52
Magnetic pyrites, 51
Magnetite, 52
Measuring strength of double refraction by von Federow mica wedge, 35
Mechanical and chemical tests, 129
Melilite, 61
Menaccanite, 62
Methods of preparing sections, 117
Mica Group, 89
Mica plate (quarter undulation), 33
Mica wedge, von Federow, 35
Micro-chemical reactions, 134
Microcline, 102
Microlites, 17
Microscope (petrographical), 7
Microscopic and optical characters of minerals, 51
Minerals and thickness of section, determined by table and diagram, 36
Monoclinic crystals, 4 principal vibration directions in, 5
Monoclinic pyroxenes, 80
Mounting sections, 124 solutions, 125
Muscovite, 89
Natrolite, 79
Negative optical character, biaxial, 46 uniaxial, 42
Nepheline, 69
Nephelite, 69
Nicol prism, 7
Nosean, 56
Noselite, 56
Noselite and haüynite, micro-chemical distinction between, 139
Nose-piece for microscope, 10
Objectives, 10
152Oblique extinction, 31
Obtuse bisectrix, 5
Oligoclase, 103
Olivine, 77
Opal, 51
Opaque minerals, characters of, 13
Optical, anomalies, 27 character, biaxial, 46 character, uniaxial, 42 classification into systems, 141 distinctions between orthorhombic, monoclinic and triclinic sections (perpendicular to bisectrices), 48, 141 distinctions between tetragonal and hexagonal sections (perpendicular to optic axis), 141 and microscopic characters of minerals, 51 principal section, 3, 4 scheme, 145
Optic axes, 4
Optic axis, 3
Optics for optical mineralogy, 1
Order of consolidation of minerals in plutonic rocks, 144
Order of interference color, determination of, 35
Ordinary light, 1 ray, 3
Orthite, 96
Orthoclase, 98
Orthorhombic crystals, 4 principal vibration directions in, 4
Orthorhombic pyroxenes, 75
Parallel and convergent light, résumé of uses of, 49
Parallel extinction, 31
Parallel face sections, grinding apparatus for, 119
Pargasite, 85
Perofskite, 57
Perovskite, 57
Petrographical apparatus, 127
Petrographical microscope, 7
Phenocryst, 14
Phlogopite, 89
Picotite, 53
Piedmontite, 95
Plagioclases, 103
Plane polarized light, 1
Plates, grinding, 121
Pleochroic halos, 59
Pleochroism, 25 test for, 25
Pleonaste, 53
Polarization colors, 28
Polarized light, characters observed by, 25 plane, 1
Polarizer, 7 test for vibration plane of, 9
Polishing sections, 124
Polysynthetic twinning, 37
Positive optical character, biaxial, 46 uniaxial, 42
Potassium, test for, by Borichy’s method, 136 test for, by Behren’s method, 138
Preparation of sections, 117
Principal section, optical, 3, 4
Principal vibration directions, 3, 4
Prism, nicol, 7
Pseudomorphic structure, 39
Pyrite, 51
Pyrites, 51
Pyroxenes, monoclinic, 80
Pyroxenes, orthorhombic, 75
Pyrrhotite, 51
Quarter-undulation mica plate, 33
Quartz, 63 wedge, 34
Reflected light, characters observed by, 13
Reflector, 7
Refraction, double, 2, 27
Refraction, index of, ix, 17
Refractive indices (mean), table of, 142
Relief, 17 test for, 17, 18
Resorption border, 15
Résumé of uses of parallel and convergent light, 49
Rotating stage of microscope, 10
Rutile, 57
Sagenite, 58
Sanidine, 102
Saussurite, 96, 113
153Saws, 119
Scapolite Group, 59
Scheme of classification into systems by optical determinations, 141
Scheme, optical, 145
Schiller structure, 25
Schrœder van der Kolk’s method for determining refractive indices, 22
Sections, methods of preparing, 117 thickness of rock, 124
Selenite plate, 33
Separation, by chemical means, 134 by electro-magnet, 134 by specific gravity, 133
Sericite, 92
Serpentine, 114
Shagreened surface, 17
Shorl, 70
Sillimanite, 73
Simple twinning, 37
Single image, 2
Skeleton forms, 17
Slides, glass, 125
Slower and faster rays, test for vibration directions of, 33
Sodalite, 56
Sodalite Group, 56
Sodium, test for, by Borichy’s method, 136 test for, by Behren’s method, 138
Sorby’s method for determining index of refraction, 19
Special micro-chemical tests, 139
Specific gravity separation, indicators for, 133
Sphærulitic structure, 39
Sphene, 96
Spinel, 53
Stage of microscope, rotating, 10
Staurolite, 74
Strained or broken crystals, 15
Strength of double refraction, measure of, 30, 35
Structure, 37
Symmetrical extinction, 31
Systems, classification into, by optical determinations, 141
Table, double refraction, 142
Table, indices of refraction, 142
Talc, 94
Test for vibration plane of polarizer, 9
Tetragonal crystals, 4
Thickness of rock sections, 124
Thickness of section and minerals, determined by table and diagram, 36
Titanite, 96
Transmitted light, characters observed by, 13 effect on crystals, 2
Transparent minerals, investigation of characters of, 13
Tremolite, 84
Triclinic crystals, 4 principal vibration directions in, 5
Tridymite, 65
Topaz, 74
Tourmaline, 70
Twinning, 37
Uniaxial crystals, vibration directions in, 3
Uniaxial interference figures, 40
Uralite, 88
Uralitization, 88
Uses of parallel and convergent light, 49
van der Kolk’s, Schrœder, method for determining refractive indices, 22
Vesuvianite, 60
Vibration direction, 2 directions of faster and slower rays, test for, 33 directions, principal, 3, 4 plane of nicol, 9 plane of polarizer, test for, 9
von Federow mica wedge, 35
Wavy extinction, 16, 31
Wedge, mica, 35 quartz, 34
Wernerite, 59
Xenomorphic, 15
Zeolites, 79
Zircon, 58
Zoisite, 96 α and β, 96
Zonal structure, 38