A
Accessory minerals, 6. Achroite, 135. Adamantine lustre, 17. Agate, 8,
16, 19, 56, 57, 69, 143, 144, 145. Alexandrite, 120, 121. Alloys of
gold, silver and platinum, 65. Alluminates, 11. Alluvial deposits, 7-8,
9, 67. Almandine, 117, 130, 131, 132. Aluminium, 10. Amazonstone, 7,
157. Amber, 18, 19, 58, 164, 165. Amber or amberoid, 58.
Amethyst,
3, 8, 16, 17, 55, 57, 58, 141, 144, 145. Amorphous, 19. Anatase, 154.
Andalusite, 154-155. Andradite, 130, 132. Angle, critical, 31-33.
Apatite, 12, 108, 128, 136, 155. Aquamarine, 17, 58, 109, 110, 124,
125, 126. Archaeans, 5.
Artificial colouring and staining, 56. Artificial diamonds, 59. Artificial ruby, 60„61. Arthasastra of Kautilya, 66. Asterism, 42, 102, 103. Asterism in star rubies, 42. Aswamedhayajna, 105. Atomic weights, 11. Aventurine quartz, 141, 142. Azurite, 155.
B Bakelite, 63, 64, 165. Balance, chemical, 23.
175
