Poldervaartite xls; N'Chwaning II Mine, Kalahari Manganese Field, South Africa; Min; unique piece
Poldervaartite crystals from the N'Chwaning II Mine, Kalahari Manganese Field, South Africa – miniature specimen as unique piece
This miniature specimen with Poldervaartite crystals from the N'Chwaning II Mine, Kalahari Manganese Field, South Africa represents an attractive collector’s piece from 2002. Several rounded, nodule like aggregates of light beige Poldervaartite crystals are prominently positioned on a dark matrix, forming an impressive three dimensional structure.
The crystals are densely intergrown and display a finely structured, partly radial surface. The spherical aggregates appear massive and create a pronounced relief effect, giving the specimen a strong visual presence. The contrast between the pale Poldervaartite crystals and the dark matrix further enhances the aesthetic appeal of this piece.
Geology & Origin
The N'Chwaning II Mine in the Kalahari Manganese Field is one of the most important localities worldwide for rare manganese minerals. The deposit formed in manganese rich sedimentary rocks that were later affected by hydrothermal processes. Poldervaartite is a relatively rare calcium manganese silicate that can occur within these complex mineral assemblages and occasionally forms well developed crystals in cavities of the deposit.
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) | 0.080000 |
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