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Large malachite sphere

Time left
17g 18h 11m 24s
13/11/2026 14:47:00
Estimate
€ 250,00 / 350,00
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Description

Large malachite sphere

gr 1346
Cu₂CO₃(OH)₂ — monoclinic system
Origin
"Store Didoni" Collection, Macherio (MB)
More information
Typically found in the Democratic Republic of the Congo, Russia (the Urals), and Namibia, it forms through secondary alteration (oxidation) of primary copper minerals (chalcopyrite, azurite) in oxidized cap zones of copper deposits. It typically grows in botryoidal aggregates with concentric green bands. Hardness 3.5–4 on the Mohs scale; density 3.6–4.0 g/cm³.

Widely used in jewelry, inlaid crafts, and as a historical pigment (“mountain green”); prized by collectors for its concentric bands; also used as a minor copper mineral.
Time auction 1251

Historia Naturalis

mon 26 October - fri 13 November 2026
The description sheets do not always indicate the state of conservation of the goods, we invite you to always request the condition report before making your offers
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