Manganite, Quartz xls; N'Chwaning I Mine, Kalahari Manganese Field, South Africa; Gerd Tremmel collection; Scab; unique piece
Manganite and Quartz crystals from the N'Chwaning I Mine, Kalahari Manganese Field, South Africa, Gerd Tremmel collection – small cabinet specimen as unique piece
This small cabinet specimen with Manganite and Quartz crystals from the N'Chwaning I Mine, Kalahari Manganese Field, South Africa originates from the Gerd Tremmel collection and was collected before 1978. The specimen shows a dense crystal covering of black Manganite crystals forming numerous radial and clustered crystal groups across the surface.
The Manganite crystals display typical prismatic to needle like crystal forms with a strong metallic luster. Small, light colored Quartz crystals occur locally between the dark crystal groups, creating a clear visual contrast against the black surface. The combination of lustrous Manganite crystals with the lighter Quartz crystals gives the specimen a very dynamic and textured appearance.
Geology & Origin
The N'Chwaning I Mine in the Kalahari Manganese Field of South Africa is one of the most important localities worldwide for manganese minerals. The mineralization occurs in manganese rich sedimentary rocks that were later altered by hydrothermal processes. Manganite is a characteristic oxide mineral from this deposit and commonly forms well developed prismatic crystals often associated with Quartz and other manganese minerals.
This table is for general information and orientation, although the sizes of the stones may vary. In addition, this specification is handled differently from region to region.
| Sizes | Description | approx. Sizes in mm/cm | approx. Sizes in INCH | |
| Capsule | Capsule | 0.1–0.5 mm in a transparent hard capsule (approx. 1 cm) | capsule contents 0.1–0.5 mm | capsule contents 0.004–0.02 in |
| TN/mm | Micromount (TN = Thumbnail) | everything fitting in a TN Perky box or a MM box of approx. 1 in | approx. 0.5–2.5 cm | max. 1 in |
| Min | Miniature specimen | will not fit a TN or MM box anymore | approx. 2.5–5 cm | approx. 0.2–1.0 in |
| Scab | small cabinet specimen | approx. one-third to half a hand size | approx. 5–9 cm | approx. 1.0–2.0 in |
| Cab | cabinet specimen | full hand size | approx. 9–15 cm | approx. 2.0–3.5 in |
| large Cab | large cabinet specimen | approx. two hand sizes | approx. 15–30 cm | approx. 3.5–6.0 in |
| very large Cab | very large cabinet specimen | everything larger, no upper limit |
Abbreviations commonly used in mineralogy.
| Abbreviation | Meaning |
| xl | single crystal, possible with matrix |
| xls | noticeable crystals |
| (xl) | embedded or damaged |
| (xls) | embedded or damaged |
| MASS | massive and/or amorphous pieces |
| TYP | type locality of the original description |
| SWUV | shortwave-UV-reaction |
| UV | ultraviolet reaction |
| SC | self-collected |
| U | unique (single unique piece) |
Usage Instructions
This product is ideal as a collector's item, decorative element, teaching material, or for scientific and exhibition purposes.
Legal Notices
Safety
We accept no liability for damages resulting from improper and/or non-recommended use. Please carefully assess the suitability of the product before any alternative use.
Responsible Provider
Mikon Mineralienkontor GmbH
Steinslieth 11
D-37130 Gleichen OT Klein Lengden
Email: info@mikon-online.com
| shipment-weight, NOT netto weight (kg) | 0.100000 |
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