Although the Thomas Range in Utah is most famous for the gemmy, sherry-colored crystals of topaz, it has also produced fine specimens of durangite, a rare sodium aluminum arsenate fluoride. Usually the crystals are on the order of 1-3 mm in size, and frankly kind of ugly. This specimen is composed of three, lustrous and TRANSLUCENT, brick-red crystals, to 1.3 cm in length. Rich red color and huge size make this a phenomenal and important specimen for any species collector and a competition-level thumbnail. Personally I have never seen one of this magnitude - it may be one of the largest from Utah ever seen, I suspect.