“Balls of tiny crystals, to 4 mm in diameter. The balls are colourless near the surface and have deep grass green cores, indicating that their chemical composition varies from pure austinite to cuproaustinite, or even zincoan conichalcite. Field width: 2.5 cm. P Haas photograph and collection (no. 72-046), ex Martin Zinn collection.”
Peter Haas - 30th November 2000