164 
INDEX. 
Plumbago - 
Page 
- 58, 91, 103 
Plush copper ore - 
66 
Plymouth marble - 
- 25 
Plymouth porcelain 
- 123 
Polishing stones - 
38 
Polybasite - 
- . - 83 
Poole clay 
- 120 
Porcelain - 
- 120 
Porphyritic structure 
- 150 
Porphyry 
16, 20 
Portland beds 
31 
Portland cement - 
- 42 
Portland vase 
- 122 
Potter’s stone 
- 28 
Pottery 
r - 120 
Precambrian rocks 
- 152 
Precious metals - 
- 56 
Precious stones - 89, 92 
, 102, 113, 114, 
Prehnite - 
115, 119 
- 118 
Proustite - 
- 83 
Pseudomorphs - 
- 55, 87, 112 
Psilomelane 
- 71, 80 
Pudding stone 
- 26 
Puddling - 
- 100 
Purbeck “ Bird’s nests ” 
- 146 
Purbeck fossils - 
- 146 
Purbeck marble - 
- 30 
Purbeck rocks 
- 154 
Purple of Cassius 
- 130 
Purple ore 
78 
Pyrargyrite 
- 83 
Pyrites 
13, 75, 80 
Pyrolusite - 
70, 80 
Pyromorphite - 
- 75, 82 
Pyroxene - 
- 117 
Pyrrhotine 
- 75, 80 
Q. 
Quarella stone 
- 53 
Quartz - 
- 14, 44, 111 
Quartz felsite 
- 21 
Quartz porphry - 
- 21 
Quaternary rocks 
- 154 
Queen’s ware 
- 122 
Quicksilver 
- 98 
R. 
Ramsay, Sir A. C. - - - 6 
Ransome’s stone - - - 42 
Realgar - - - - - . 85 
Page 
Reaumur’s porcelain 
- 126 
Red lead - 
- 98 
Redruthite 
- 13/67 
Rhaetic fossils 
- 145 
Rhaetic rocks 
- 153 
Rhodonite 
00 
© 
0* 
Rhombic pyrites - 
- 75 
Riband veinstone 
86 
Riband jasper 
- 112 
Rinman’s Green - 
- 96 
“ Roach ” - 
- 31 
Rock cork - 
- 117 
Rock crystal 
- Ill 
Rock-forming minerals 
- 149 
Rock room - 
- 149 
Rock salt 
• 90, 106 
Rock structures - 
- 150 
Rock types - 
- 150 
Rockingham ware 
- 124 
Roman cement - 
- 41 
Roman glass 
- 128 
Roman mosaic 
- 2, 134 
Roman pottery 
- 121 
Rose quartz 
- 112 
Rosebridge pits, section of 
- 137 
Rosette copper - 
93 
Rubellite - 
- 114 
Ruby - 
- 114 
Ruby blende 
- 83 
Rutile - 
71, 79 
s. 
Safety lamps 
- 
138 
Saflor - 
- 
96 
St. Cuthbert’s beads 
- 
23 
Salt 
- 
106 
Salt glazed ware - 
- 
122 
Salt mines, models of - 
- 
135 
Saltpetre - 
- 
108 
Samian ware - 
- 
121 
Sandstones 
- 
34 
Sandstone, flexible 
- 
112 
Sapphire - 
- 
114 
Sard - 
- 
113 
Sardonyx - 
- 
113 
Satin spar - 
40, 
108 
Scagliola - 
- 
41 
Scapolite - 
- 
116 
Scheelite - 
69 
>, 81 
Schmeltz glass - 
- 
129 
Schorl - 
- 
114 
