Posnjakite xls; Lautenthal, Harz, Germany; Scab; unique piece
Posnjakite crystals from Lautenthal, Harz, Germany – small cabinet specimen as unique piece
This interesting specimen displays Posnjakite on a dark, strongly weathered matrix from the historic mining district of Lautenthal in the Harz Mountains. Blue-green Posnjakite crystals and crystalline coatings are visible in several cavities and along fractures, creating an attractive contrast with the brown to dark grey host rock. The crystals occur as fine aggregates and give the specimen a lively appearance. Numerous cavities and weathering structures further emphasize the character of this rare copper mineralization.
Geology & Origin
Posnjakite is a rare hydrated copper sulfate hydroxide that forms as a secondary mineral within the oxidation zone of copper-bearing ore deposits. It develops through the alteration of primary copper minerals under the influence of oxygen-rich solutions. Lautenthal in the Upper Harz is one of Germany's classic mining regions, known for its long mining history and remarkable diversity of secondary copper minerals. Specimens from this locality are highly valued by collectors for both their historical significance and mineralogical diversity.
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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