"pg. 15  gem, blue topaz, 1969, Texas blue topaz, the state gem of Texas, is found in the Llano uplift area in Central Texas, especially west to northwest of Mason. The Texas topaz comes in several tints from almost colorless to a baby blue, aqua-blue and deep sky-blue. info (scroll down to ""topaz"" on this site: http://geology.uprm.edu/Morelock/29Mas.htm)"
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