Duftite pseudom. after ?, Beudantite xls; Tsumeb Mine, Otavi Mountains, Namibia; Ilse Baer collection; TN; unique piece
Duftite pseudom. after ? and Beudantite crystals from the Tsumeb Mine, Otavi Mountains, Namibia, Ilse Baer collection – micromount as unique piece
This micromount specimen shows fine-grained to crusty Duftite, possibly occurring as a pseudomorph after an as yet not clearly identified precursor mineral, associated with Beudantite crystals from the Tsumeb Mine. The olive-green to yellow-green Duftite aggregates cover large parts of the surface, forming irregular and densely intergrown textures. On and between them are small but clearly recognizable Beudantite crystals with typical brownish-yellow to olive tones and dull to slightly lustrous crystal faces. The combination of a possible pseudomorph and well-defined Beudantite crystals makes this specimen mineralogically particularly interesting. This is a classic collector specimen that was verifiably collected prior to 1972.
Geology & Origin
The Tsumeb Mine in the Otavi Mountains, Namibia, is renowned for its exceptionally complex secondary mineral assemblages. Duftite and Beudantite are arsenate and phosphate minerals that form in the oxidation zone of polymetallic ore deposits. The possible pseudomorphism indicates multi-stage alteration processes under changing chemical conditions, which are characteristic of Tsumeb. The Ilse Baer collection represents carefully selected and classically documented historical Tsumeb micromounts.
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) | embeddet 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) | 0.050000 |
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