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Saugandika—spinel, 104.
Scale of hardness, Moh's, 20.
Scalenohedron, 15.
Scapolite, 108.
Sedimentary rocks, 6, 7, 8.
Serpentine, 159.
Shorl, 135.
Shwelu, 148.
Sidney Ball, 49,
Silicates, 12.
Silk in ruby, 103, 104.
Silky lustre, 17.
Sinai peninsula, 1.
Size and weight of gems, 55-56.
Smith, H. G., 5, 37, 88. „ Refractometer, 34.
Smithsonite, 159.
Smoky quartz, 141.
Sodalite, 159-160.
Soni, Sir Bagchand, 125.
Special mountings, 58.
Specific gravity, determination of, 22-29.
Specific gravity, liquids, 27.
„               of diamonds, 68.
table of, 166-167.
Spencer, L. J.> 4, 5.
Spessartite, 130, 131, 132.
Sphene, 160.
Spinel, 11, 60, 63, 101, 104, 107, 108, 109, 117, 118, 119; introduc­tion, 116; physical properties, 116-117; uses, 117; grades or varieties, 117-118; occurrence, 118; industry, 118-119; reputed spinels, 119.
Spodumene, 160.
„ crystals, 7, 13.
Star of the South diamond, 72, 98.
Star rubies, 63, 103, 104. Star sapphires, 8, 63, 103, 104.
Star stones, 42, 105.
Staurolite, 8, 160.
Stewart diamond, 100.
Sutton, 73.
Sunstone, 157.
Syenite, 6, 7, 107.
Index Page of 187 Index
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