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Iceland spar, refractive index of, 103
Ice, refractive index of, 103
I. D.B. laws (Illicit Diamond Buying), 36
Ilmenite, 20
India, diamonds in, 4
Inverel diamonds, 91
Internal strain in diamonds, 104
Iron a solvent for carbon, 116
ore, density of, 93
pyrites, 20
Jagersfontein diamond, 79
Mine, 14
--------characteristics of diamonds from, 68 Jeffreysite, 20
Kafirs, 42
Kamfersdam Mine, 15
--------characteristics of diamonds from, 66
Kenilworth depositing floors, ! 47
Kimberley, 6
blue ground, 10 \
mines, 14, 23, 34
Mine in old days, 25
--------at the present day, 34
--------characteristics of diamonds from, 63 I
shales, 15 j
West Mine, 15
characteristics of diamonds from, 66
Kirsten's automatic diamond
collector, 57 :
Klipdam, 8, 23 I
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Koffyfontein Mine, 14 Koh-i-noor diamond, 80
hardness of, 91 Kyanite, 20, 71
Lamp, ultra-violet, 97 Leicester Mine, 15, 23 --------characteristics of diamonds from, 67 Loterie d'Angleterre diamond, 80 Lustre of rough diamonds, 56
Machinery for washing and
concentrating, 49 Macles, 86 Magnetite, 20, 71
density of, 93 Maskelyne on diamonds, I Matabele, 12, 39 Matrix of diamond, 67 Melaphyre, 10, 16 Melting-point of carbon, no Meteor, Canyon Diablo, 136 Meteoric diamonds, 134 Meydenbauer on meteoric
diamonds, 135 Mica, 20, 71
density of, 93 Moissan's experiments on
the genesis of diamond,
"5 Mud volcano, 24
Nassak diamond, 80
Natal, coal in, 6
Natural formation of diamond, 127
Newlands Mine, 15
--------characteristics of diamonds from, 67
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