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Paragonite 53 66 Parallel orientation 39 Paramorphic 8 9 Parenchymatous cells 48 PARKER 22 Paving-stones 45 PEARCEY xx Pectolite 15 16 Peg-structure 27 Pegmatitic 45 Pencils, lead xxv Penrith 36 Penrhyn quarries xxii 52 Penzance 59 Peppercraig 46 Pericline 2 29 38 Peridotite 24 Perlite 69 70 Perlitic cracks 31 69 70 Permian 14 36 Perthshire 11 54 Petalospyris 56 Petrographical delineations xxv xxvi xxvii xxviii Phenocrysts 27 28 41 43 45 46 47 69 70 PHILLIPS 10 24 36 71 72 Phonolite 25 Phyllites 52 Picotite 23 24 Picrite 7 24 29 Picritic-Serpentine 23 Pilite 24 PIRSSON 34 42 49 52 PISANI 60 Pitchstone 9 11 12 13 15 16 34 35 36 37 38 42 45 46 49 51 53 59 65 66 68 70 Plateau, Highland 54 Plauenscher Grund 65 66 PLAYER 51 Pleochroism 9 23 26 28 29 39 41 42 43 44 46 47 49 Pleochroism, anomalous 24 PLINY 65 Plutonic 65 Pdocyrtis 56 Poecilitic 7 23 41 42 43 Polycystina 56 Polysynthetic twinning 15 16 27 60 Pores, strings of 47 53 55 57 65 66 Porifera 56 Porphyritic 13 50 Porphyritic, basalt 13 45 Porphyritic, felsite 50 Porphyritic, perlite 69 Porphyritic rhyolite 50 Pre-Cambrian 39 Predazzite 64 Prehnite 15 16 Preparation of rock-sections i PRIEST 40 45 63 71 Prismatic cleavage 29 30 38 39 53 PROCTOR xxviii Productus giganteus 71 Pseudodiadema 17 Pseudomorphs 23 34 43 51 52 Pseudophite 24 Puddingstone 20 Pulverulent materials xviii Pulvinulinae xx 4 5 22 48 Pyrite, iron 3 15 16 52 Pyroxene 1 2 30 51 57 68 Pyroxene, green 51 57 58

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