Page 253 - A Practical Introduction to Optical Mineralogy

INDEX INDEX
manganite App. C interference colour 8-9 oxides cont. polishing
marcasite 147, App. C interference figures 9--10 corundum 160 hardness 23
martite 162 biaxial 9--10 hematite 161 procedure 28
melilite group 30, 90 isotropism 8 ilmenite 162 relief 18, 23
melnikovite 150, App. C pleochroism 5 iron-titanium oxides 155-6 potassium feldspar 72-7
mesoperthite 70 relief 6 magnetite 163 polytypes 32
metacinnabarite 144 twinning 11 rutile 164-5 prehnite 34
miargyrite App. C uniaxial 9 spinel group 157-8 proustite 148, App. C
mica group 34, %-4 zoning 11- 12 spinel 165 pseudobrookite 156, App. C
biotite 92-3 mispickel see arsenopyrite uraninite 166-7 pseudoleucite 85
glauconite 91 Moh's hardness Table 1.2 oxyhornblende 54 psilomelane App. C
lepidolite 91 molybdenite 147, App. C pumpellyite 30, 98
muscovite 94 monochromatic (light) 186, 4.1 pargasite 4 7 pyrargyrite 148, App. C
paragonite 91 montmorillonite group (smectites) 32, 60 path difference 186 pyrite 149-50, App. C
phlogopite 91-2 muscovite 94 pentlandite 148, App. C pyrolusite App. C
microcline 74-7 sericite 94 periclase 137, 169 pyrope 87-8
microhardness 25 perthite 70, 77 pyrophanite 162
micro-identation hardness 1.9 native elements 177-9 perovskite App. C pyroxene group 6, 31, 99-117
microscope, reflected light 12-16 copper 177 phlogopite 91-2, 93 aegirine (acmite) 114
analyser 16 gold 178 phosphate 175 aegirine--augite 114
Bertrand lens 16 graphite 17 8 apatite 115 augite 11()..-11
incident illuminators 13-14 silver 179 collophane 175 crystallisation trends 103-4
light control 16-17 natrolite 130 phyllosilicates 32 diopside- hedenbergite 108-9
light source 12 nepheline 85-6 polytypes 32 enstatite-orthoferrosilite 105-7
objectives 15-16 nephrite 47 sheet silicates 32, 2.3 exsolution lamellae 102
polariser 12 nesosilicates 30 picotite Table 3.2 jadeite 112
use of 26-8 island silicates 30 piemontite 63 monoclinic pyroxenes (cpx) 99, 108-20
microscope, transmitted light 1-5 orthosilicates 30 pigeonite 109, Table 4.10 omphacite 113
accessory slot 4 Newton's scale 186, 189 pitchblende 166, App. C orthopyroxenes ( opx) 99, 105-7
analyser 4
niccolite 176-7, App. C plagioclase feldspars 11, 78-84, %-3 pigeonite 109
Bertrand lens 4 nickeline see niccolite albite 78 spodumene 116
condenser 3 norbergite 88-9 albite twinning 80 wollastonite 116-17
convergent lens 3 nosean 84 anorthite 78 pyrrhotine see pyrrhotite
crossed polars 4 numerical aperture 15, 1.5 carlsbad twinning 80 pyrrhotite 15~1. App. C
eyepiece 4 celsian 84
focusing 5 objectives (lenses) 4, 15-16 lamellar twinning 80 quantitative colour 209-11
light source 1 cleaning 23 plane polarised light 3 quartz 6, 34, 121-2, 240, Table 1.2
objectives 4 oblique extinction 201 platinum App. C a-quartz 12()..-1
plane polarised light 3 oil immersion pleochroic schemes 5, 197-201 ~-quartz 12()..-1
polariser 1 reflected light 22-3 pleochroism quartz wedge 191
stage 4
olivine group 8, 10, 30, 95-7 reflected light 19
sub-stage diaphragms 3 corona structures 97 transmitted light 5-6 rammelsbergite App. C
use of 27-8 kelyphitic margin 97 pleonaste Table 3.2 realgar App. C
migmatite 40 omphacite 113 polarisation reflectance 19, 203-9
millerite App. C ophiolite suites 52 colours 212-17 grey scale 19
mineral properties, transmitted light 5-12 optic axes 184 figures 16 indicating surfaces 206-9
alteration 7 optic axial angle 10, 184 polarised light 180 reflected light
birefringence 8-9 optic axial plane 184 circularly 202, 5.1 microscope 12-16
cleavage 6 optical constants 203 elliptically 202, 5.1 theory 202-17
colour 5
dispersion curves of 204 linearly 180, 202, 5.1 refractive index 6, 181, 203
dispersion 12 orpiment App. C plane 180, 5.1 relative polishing hardness 23-5, 1.8
extinction angle 1 ()..-11 orthoclase 67-70, 73-7, 240, Table 1.2 polariser 1 relief
maximum extinction angle 11 orthopyroxenes 10, 99, 102-4, 105-7 polished sections reflected light 24
oblique 10 oxides 155-67 appearance 17 transmitted light 6
straight 10 cassiterite 158-9 preparation 28, 1.11 resglution 1.5
habit 6 chromite 160 systematic description 19 retardation 187
246 247