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INDEX.
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Á.
Abrasives, 60. 61, 63 Absorption Spectra, 32
in Garnet. 249 in Zircon, 260 Achates, 106 Achroite. 277 *
Adamantine Spar. 185 Adamas Siderites, 185 Adelaide Rubv, 249 Adularescence, 31 Adularia. 210 Agate. 105
applications, 170
brecciated, 174
cutting of, 173
Eyed, 13
Faulted, 108
Fortification, 13
Mocha. 14
Moss, 12
origin of, 11
priming of, 12
Ribbon, 174
shape of, 14
skin of, 13, 107
staining. 171
tube of escape, 14
Vein. 14. 174
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Agate-opal, 181 Akerite, 200 Alabandin Ruby, 198 Alabaster, 286
Egyptian, 207 Alabastrites, 207 Alalite, 219 Albite, 214
labradorescent, 214 Albite-moonstone, 214 Alexandrite, 201 Allotriomorphic crystals, 49 Allotriomorphism, 19 Almandine, 248
Spinel, 198 Aluminium pencil test for gems,
70 Amazonstone, 213 Amber, 287 Ambre Antique, 289 Amethyst, 152
Oriental, 196
Purple, 196 Amphibole, 223 Andalusite, 268 Andradite, 249 Angle, critical, 25 of incidence, 23
of refraction, 23 Anisotropic minerals, 28
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