$450Median
2844Sold (12 mo)
$40Last sale
Jacobsite with Calcite
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Lustrous sharp black octahedral crystals of jacobsite across a calcite crystalline matrix. This is very good for the species. In good condition.
The N'chwaning III Mine, situated within the renowned Kalahari Manganese Field in the Northern Cape of South Africa, represents one of the world's richest and most scientifically significant manganese deposits, with mining operations expanding significantly in the latter half of the twentieth century. Geologically, the deposit is hosted within the Paleoproterozoic Hotazel Formation of the Transvaal Supergroup, where extensive chemical sedimentation and subsequent hydrothermal alteration created unique manganese-rich ore bodies. Mineralogically, the mine is celebrated worldwide for producing exceptional specimens of jacobsite, a dense manganese-iron oxide mineral belonging to the spinel group, which forms sharp, lustrous, metallic black octahedral crystals with calcite.
Product details
SizeThumbnail
Dimensions1.5 x 1.5 x 1.0 cm
Added on08/29/2026
LocalitySouth Africa, Northern Cape, N'Chwaning III Mine
Current owner
Unknown Owner
Previous owners
| Date | Collector | Acquisition price |
|---|---|---|
| — | Weinrich Minerals | Not disclosed |
Learn more
Mineral guide
Learn about Calcite
diverse shapes, colors, and optical quirks; widely available yet scarce elite pieces from Elmwood and Charcas drive collecting value and display.Regional guide
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