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Characteristics of diamonds from the different mines,
64
Chemical properties of diamond, 89
Chromate of lead, refractive index of, 103
Chrome diopside, 71
iron, 20
-------ore, 71
-----------density of, 93
Chromite, 20
Classification of rough diamonds, 73
Cleavage of diamonds, 78 Coke, density of, 93 Colesberg Copje, 26 Collecting the gems, 55 Coloured diamonds, 62, 82 Combustion of diamond, 89
temperatures of diamond, boart, graphite, and carbon, 90
"Comet " crushers, 49 Compound system, 36, 37 Concentrating and washing
machinery, 49 Convict labourers, 71 Cordite, diamond from explosion of, 123 Corundum, 20
density of, 93 Cradock,6 Craters or pipes, 18 Crown glass, refractive index of, 103
Crusher, "Comet," 49 Crystallisation of diamond,
86 Crystals, octahedra, of diamond, 63, 86
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Cullinan diamond, 15, 76, 80, 104
Dallas, Captain, 40 DeBeersConsolidated Mines,
7,33 -------floors at Kenilworth,
47
-------Mine, 14, 24, 34
-----------characteristics of
diamonds from, 64
-------strong-room, 74
! Delhi diamond, 107 Density of diamond, 57, 93
of graphite, 83, 93
of stones accompanying diamond, 70, 71, 93, 95
I Depositing floors, 46 i Dewar, Sir J., conversion of I diamond into graphite, 123 ! Diabase, olivine, 16
Diallage, 20
Diamond, absorption spectrum of, 101
and polarised light, 104
a new formation of, 122
ash of, 82, 89
collector, automatic, 56
combustion of, 89 -------temperature of, 90
converted into graphite, 100
density of, 57, 93
i etched by burning, 88 I explosion of, 120 i genesis of the, 115
in meteors, 134
in Rontgen rays, 107
matrix of, 67
natural formation of, 127
Office at Kimberley, 73
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