Ramayana, 1.
Ramallakota, 80.
Raolkonda mines, 46, 76, 77.
Rati, 56.
'
Reflection of light, 29.
Refraction of light, total refraction, 29-32.
Refractive index of gems, 18, 30, 36.
Refractive index, determination of, 33-37.
„ „ table of, 166-167.
Refractivity, 17. Refractometer, 29.
method,
33, 34-37. Smith's, Tully's, 34-37. Regent diamond, 72. Resinous
lustre, 17. Rhodes, Cecil J., 82. Rhodonite, 158-159. Rhombohedron, 15.
Rock crystals, 18, 141, 143, 144, 145. Rose cut, 42, 47. Rose quartz,
58, 141, 144. Rubellite, 135. Rubicelle, 117. Rubies, bad properties,
105. Rubies, 1, 3, 4, 6, 9, 12, 14, 18, 19, 38, 40, 45, 63, 66, 101,
103, 104,
107, 108, 111, 116, 125, 127. Ruby, cutting, 105; price of ruby, 106; powers attributed to ruby,
106. Rubies, marketing, 113-115.
Ruby
mines, Burma, 3,107,108,111-113,115,121,136,138,140,150. Ruby,
occurrence, 106-111. Ruby spinels, 116, 117, 154. Rutile, 11.
S
Saucy diamond, 97.
Sapphires, 1, 4, 6, 9, 12, 16, 19, 37, 46, 63, 101, 103, 104, 107, 108,
109,110,
111, 116, 118. Sapphire bearing pegmatites of Kashmir, 10.
Sapphire—roby mines of Ceylon, 2. Sapphire, white, 60. Sapphirine, 117.
Saugandika, 116.
185 13
