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Ch. 4: Several Gemstones

Ch. 4: Several Gemstones Page of 296 Ch. 4: Rubies Text size:minus plus Restore normal size   Mail page  Print this page
CORUNDUM.
113
lized alumina almost pure, without regard to the colour of these minerals.
Corundum comprehends three varieties: the hya­line corundum, the laminated corundum, and the granular corundum. The first variety comprehends the precious stones.
The primitive form of the crystals of corundum is the six-sided prism (Fig. 52), but the most general form of the hyaline corundum is the dodecahedron (Fig. 53), with faces formed of isosceles triangles.
Nearly all the hyaline corundums susceptible of being employed in jewelry are brought from Pegu. The price of these stones is very high. It is not a rare occurrence for the price of the ruby to exceed
Ch. 4: Several Gemstones Page of 296 Ch. 4: Rubies
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