167

Two malachite ashtrays

Time left
17g 4h 10m 25s
13/11/2026 16:46:00
Estimate
€ 200,00 / 400,00
Your bid
The reserve price has not been exceeded The reserve price has been exceeded
 €
Set your maximum bid
Offer
Description

Two malachite ashtrays

Cu₂CO₃(OH)₂ — monoclinic system
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
Discover Similar Lots