Braunite II, Hausmannite, Celestine xls; Wessels Mine, Kalahari Manganese Field, South Africa; Gerd Tremmel collection; Cab; unique piece
Braunite II, Hausmannite and Celestine crystals from the Wessels Mine, Kalahari Manganese Field, South Africa, Gerd Tremmel collection – cabinet specimen as unique piece
This cabinet specimen with Braunite II, Hausmannite and Coelestine crystals from the Wessels Mine, Kalahari Manganese Field, South Africa originates from the Gerd Tremmel collection and was collected before 1985. The specimen displays numerous black, lustrous crystal groups of Braunite II and Hausmannite developed on a lighter colored matrix.
Colorless to slightly transparent Coelestine crystals occur locally between the dark crystals, forming fine prismatic crystal clusters. The combination of deep black manganese minerals and the light Coelestine crystals creates a striking mineralogical and visual contrast within the specimen.
Geology & Origin
The Wessels Mine in the Kalahari Manganese Field is one of the most important localities worldwide for manganese minerals. The deposit formed in manganese rich sedimentary rocks that were later modified by hydrothermal processes. Braunite II and Hausmannite are typical oxide minerals from this deposit, while Coelestine, a strontium sulfate, can occasionally crystallize in cavities of the mineral rich host rock where it forms fine well developed crystal aggregates.
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) | 0.500000 |
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