Libethenite xls; Estremoz, Portugal; Gerd Tremmel collection; Scab; unique piece
Libethenite crystals from Estremoz, Portugal, Gerd Tremmel collection – small cabinet specimen as unique piece
This small cabinet specimen shows Libethenite crystals from Estremoz, Portugal, from the Gerd Tremmel collection. The surface is extensively covered with dense, finely developed Libethenite crystals displaying a rich dark green to blackish green color. The crystals are clearly developed and form a sparkling drusy coating with vivid vitreous luster. In some areas, more intense emerald green zones stand out, creating an attractive color contrast with the lighter matrix. The crystals give the specimen a striking and richly textured appearance with a well defined crystal surface.
Geology & Origin
Libethenite is a basic copper phosphate that forms secondarily in the oxidation zone of copper bearing deposits. It develops through the reaction of phosphate bearing solutions with primary copper ores. The Estremoz region is known for various copper and phosphate occurrences in which characteristic secondary minerals such as Libethenite precipitate in fractures and cavities. The crystals shown here illustrate typical formation processes within oxidized copper ore zones.
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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