CHRYSOCOLLA ROCK SPECIMEN
Chrysocolla Rock Specimen with vibrant colour and coverage over the host rock. Stands well on two ends for display. A deep blue green lustrous coating on bubbly or botryoidal forms, part of the black matrix looks like Heterogenite Co3+O(OH) with a tell tale cobalt blue colour under the black.
Etoile Mine, Lubumbashi, Congo.
9cm x 5.5cm x 4cm, 207g.
Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O.
The name Chrysocolla was first used by Theophrastus in 315 B.C. and comes from the Greek chrysos, meaning “gold,” and kolla, meaning “glue,” in allusion to the name of the material used to solder gold. A mineral of secondary origin, commonly associated with other secondary copper minerals, it is typically found as glassy botryoidal or rounded masses or bubbly crusts, and as jackstraw mats of tiny acicular crystals or tufts of fibrous crystals. Copper-bearing allophane can look similar.