HINTS FOR OFFICERS IN THE DETECTION OF PRECIOUS STONES, 
TABLE III. 
Sprciric Gravity or Precious SToNnzEs, 
Anatase: son Bisel Peet 
Zircon—jacinth ... 
» —Jargoon .., 
Garnet—almandine 
Corundum gems ,,, 
Bobrowska garnet 
Chrysoberyl cat’s eye 
Garnet—pyrope ... 
Chrysoberyl ... 
SDN ne | cop — cc 
Essonite garnet 
Topaz 0 
Diamonds or. vats 
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Peridot 
Chevolie ei m5 
WOW Bo con vor 
Diopside <n 
Axinite... ; 
Spodumene .,.. 
Tourmaline ... 
Euclase... 
Phenakite 
Hiddenite ; 
Lurqueise wy ie. 
Emerald 
Beryl ‘ 
Qiuanizee sees 
Tolite 
Moonstone .,, 
Apophyllite . 
Oil lage a 
4°86 
48 to 4°6 
(Only orange and dull 
47 to 4... green varieties are be- 
low 4°6). 
4°3 to 4 
(Ruby; sapphire; orien- 
42 to 4... tal topaz, emerald, and 
amethyst). 
Or 
... (Cinnamon stone). 
(Average 3°52). 
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TABLE IV. 
SYsTEMS IN WHICH Precious StonEs CRYSTALLIZE, 
Cubic or Monometric System. 
Diamond. 
Garnet. 
Spinel. 
Commonest form of crystal. 
Octahedra, rhombic dodecahedra, Faces 
often curved. 
Rhombic dodecahedra, 
Octahedra, 
19 
