Manganite with Calcite – N'Chwaning II Mine, Kalahari Manganese Fields, South Africa | Natural Specimen

A lustrous Manganite specimen with traces of Calcite, sourced from the N'Chwaning II Mine in the Kalahari Manganese Fields — one of the most mineralogically significant localities on earth and a name that carries immediate recognition in any serious mineral collection.

Geological profile:

Manganite from N'Chwaning II forms within hydrothermally altered Wessels-type manganese orebodies — a geological province hosting the largest known land-based manganese deposit on the planet. The manganite — manganese oxyhydroxide (MnOOH) — crystallises as prismatic, striated crystals with characteristic sub-metallic lustre. The calcite traces reflect late-stage carbonate mineralisation within vugs and fractures, adding both visual contrast and mineralogical depth to the specimen.

Specimen highlights:

• Dark, lustrous manganite crystals displaying prismatic habit and fine surface striations
• Traces of calcite providing pale contrast against the deep black-grey manganite
• Natural and undamaged — no treatments, polishing, or enhancement

Why collectors value this piece:

• N'Chwaning II has produced some of the most important Southern African mineral specimens over the past four decades — the provenance is globally recognised
• Well-crystallised manganite from this locality emerges intermittently as mining operations intersect mineralised vugs, making quality pieces increasingly scarce
• The calcite association documents two distinct phases of mineralisation within a single specimen
• A foundational South African locality piece for any collection focused on manganese mineralogy or Kalahari Manganese Fields material

Specimen details: Natural Manganite with Calcite. Each piece varies in crystal size, lustre, and calcite distribution. Sourced and verified for N'Chwaning II Mine, Northern Cape, South Africa. Photographs represent the actual specimen or specimen grade available