This is a rare specimen on the market, as only a single lot of these Mexican buergerites arrived at the Tucson show years back from a new find, and then the person who mined them died without ever revealing the location they came from; so that was likely all there will ever be. The abundant crystals, to 1.2 cm, are brown with an iridescent golden sheen characteistic of this tourmaline species. 5.3 x 3.7 x 2.5 cm