An excellent and richly-covered specimen, both front and back, of lustrous, dark green olivenite crystals to 7 mm on matrix from Tsumeb. An EXTRA-SPECIAL BONUS, is that, many of the olivenite crystals rest on light and dark green, botryoidal chenevixite. Chenevixite is an uncommon copper asenate. SUPERB crystals for the species! 6.0 x 5.3 x 2.8 cm