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Diamond, physical and chemical properties of, 89
pipes or craters, 18
radio-activity of, 109
refractive index of, 103
Trade Act, 36
triangular markings on,
tribo-luminescenceof, 100 Diamonds, coloured or fancy,
62, 82
Maskelyne on, I
noteworthy, 76
phosphorescence of, 96
produced, weight, value of, 35
yield of, from De Beers, 60
Drift, diamonds from the, 12 Duke of Tuscany diamond,
80 Dutch boart, or zircon, 59 Dutoitspan Mine, 14, 23 -------characteristics of diamonds from, 64
Eclogite, 20
containing diamonds, 67 Electrons, bombardment by,
98 Emerald, refractive index of,
,103 Empress Eugenie diamond,
80 Enstatite, 20
Explosion of diamonds, 120 Excelsior diamond, 80
Fancy stones, 62 Fingoes, 39
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Flint glass, refractive index
of, 103 "Floating Reef," 21 Floors, depositing, 46 Fluor-spar, refractive index
of, 103 Formation, new, of diamond,
122 Fort Beaufort, 6 Franklinite, 97 i Frank Smith Mine, 15 characteristics of
diamonds from, 66 I Fraserburg, 6
I Garnet, 20, 70
I density of, 93
I Genesis of the diamond, 115
[ " Golden fancies," 65
Granite, 18 i density of, 93
Graphite, 81, 83
combustion temperature
; of> 9°
j conversion of diamond
! into, 100
I density of, 93
I diamonds coated with, 99
j Graphitic oxide, 83, 93
j Grease, collecting diamonds
by aid of, 57 i
! Hard blue ground, 47 I Hardness of diamond, 90 I Haulage system, 46 Hexakisoctahedron crystal,
: 86
Hope blue diamond, the, 80 j Hornblende, 71 I density of, 93
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