This specimen could also be described as mammillary or grape-like, with a mostly blue surface and some slightly greener overgrowth. The specimen is in good conditional for a mineral that tends to bruise easily, with only some incompleteness on the backside out of view. I usually see Malachite specimens from the Star of Congo and pure Chrysocolla specimens are less common.
Malachite | #Geology
Colour: Bright green, with ...
Hardness: 3½ - 4
From the Star of Congo Mine, Lubumbashi, Katanga Province, Dem. Rep. of Congo.
Measures 8.4 cm by 9.4 cm by 10 cm in total size.
The Mineral Gallery, In