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Diamond, associated minerals.
122 Australian localities,
118 Bristol, 150 chemical composition,
127
cleavage, 98 cleaving, 57 colour, 94 constitution of, 80
counterfeiting, 185 crystalline form, 99 dispersion of, 96 early record
of, 93 effect of X-rays on, 97 electrical behaviour,
97 European localities,
119
famous specimens, 136 glaziers, 131 " grain " of, 62 grinding, 60
hardness, 98 inclusions in. 102 Lake George, 150 localities, 105 lustre
of, 95 Matura, 261 mining, 128 North American localities, 120 origin
of, 80, 104, 124 phosphorescence of, 96 plateau deposits, 115 Pliny's
description of,
93 polishing, 60 recognition of, 136 refraction of, 95 " ripe," 94
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Diamond river deposits, 114
setting of, 184
slitting of, 58
South African localities, 105
temperature of ignition, 97
" unripe," 94
valley deposits, 115
value of, 134 Diaphaneity, 28 Dichroite, 288 Dichroscope, 80 Dioptase, 255 "
origin of, 11, 15 Diopside, 218 Dispersion of light, 24 Dop, 59 Doublets, 77
Doubly Detracting Spar, 205 Dravite, 277
Dresden Green Diamond. 94 Dynamo-metamorpbism, 19
K.
Egyptian Emerald mines, 282
Jasper, 175 Eisenkiesel, 160 Electrical phenomena of minerals.
34 Electrum, 287 Elic Ruby, 247 Emerald, 229
artificial, 91
Brazilian, 277
Copper, 255
Ealse, 181
mossy, 237
Oriental, 196
Uralian, 250
value, 237 Emery, 185, 197
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