Descloizite, Calcite xls; Tsumeb Mine, Otavi Mountains, Namibia; Ilse Baer collection; Min; unique piece
Descloizite and Calcite crystals from the Tsumeb Mine, Otavi Mountains, Namibia Ilse Baer collection– small cabinet specimen as unique piece
This miniature specimen with Descloizite and Calcite crystals from the Tsumeb Mine, Otavi Mountains, Namibia originates from the Ilse Baer collection and was collected before 1972 The specimen shows an attractive combination of dark, metallic Descloizite crystals and lighter Calcite crystals forming a striking mineral association.
The Descloizite crystals occur in dense, lustrous aggregates that form the darker portion of the specimen. Between these areas, transparent to whitish Calcite crystals are developed, adding structure and depth to the piece. Reddish brown coatings can also be observed locally, giving the specimen an especially vivid color contrast.
Geology & Origin
The Tsumeb Mine in the Otavi Mountains of Namibia is one of the world’s most important localities for secondary copper, lead and vanadium minerals. The exceptionally complex mineralization formed in a hydrothermally altered carbonate deposit and resulted in the formation of more than 300 different mineral species. Descloizite is a typical vanadate mineral of the oxidized zone of the deposit and commonly occurs together with carbonates such as Calcite.
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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