Tucson Treasures: 2023

Abstract

Figures 1A and B. Quartz with petroleum, 2 cm across, Madirobe, Mahajunga Province, Madagascar. Available from Laurent Thomas were these fascinating quartz crystals with petroleum inclusions. Many, such as this example, had movable bubbles in the liquid, and all showed spectacular fluorescence under ultraviolet radiation. A: Taken under daylight-equivalent strobe light. B: Taken under longwave ultraviolet (395-nm) light. MARK MAUTHNER Postfach 0035 8010 Graz Austria mmauthner@gmail.com