Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 170
Figs. 69 and 70.—Modified Crystals of Quartz. the other, oxygen, is a gas, and one of the principalconstituents of atmospheric air. The primitive form of quartz is the rhombohedron,but the primitive crystals are extremely rare. Themost common form is the regular hexagonal prismterminated with…
Precious stones · Diamonds · Gems
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