UNITED STATES, CANADA AND MEXICO                      l6l
	Lapis lazuli has been shown to be, not a definite mineral, but a mixture of a colorless and a blue substance, the latter (the min­eral hauynite), predominating. The yellow spots of so-called gold are really iron pyrites. It was the sapphire of the ancients. Its hardness varies from 5 to 5.5 and its specific gravity is 2.4. The finest is brought over from Persia, but it is also found in Siberia, Tartary, China, and Thibet.