The Perot Museum of Nature and Science is introducing a new exhibit: Topaz: A Spectrum in Stone. The exhibit highlights the mesmerizing beauty of one of nature’s most captivating minerals.

Texas also has a claim to the gem. The rare blue topaz that has sat at the governor's desk for many years is another feature in the exhibit. The largest known “Lone Star Cut” is another ...

That’s the only place in Texas where topaz occurs. Nuggets of it are often found in creek beds and ditches, along with quartz and arrowheads. Especially prized is blue topaz, the official Texas ...