Bastnäsite-(Ce) xl, Allanite-(Y); Trimouns, Ariège, France; Min; unique piece
Bastnäsite-(Ce) crystal and Allanite-(Y) crystals from Trimouns, Ariège, France– miniature specimen as unique piece
This miniature specimen features a well-formed, honey-brown Bastnäsite-(Ce) crystal resting on a white, finely crystalline matrix. Embedded dark brown to black Allanite-(Y) crystals accompany it, recognizable by their elongated, prismatic habit. The combination of a sharply defined Bastnäsite-(Ce) crystal with the embedded Allanite-(Y) makes this piece particularly attractive and characteristic of the renowned Trimouns locality.
Geology & Origin
The Trimouns talc deposit in the French Pyrenees is globally known for its remarkable diversity of rare-earth minerals. Bastnäsite-(Ce) and Allanite-(Y) form in hydrothermally altered pegmatites and carbonate rocks where rare-earth elements become concentrated through metasomatic processes. These geochemically complex conditions allow for the formation of sharp Bastnäsite-(Ce) crystals alongside the typical embedded Allanite-(Y) 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) | 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) | 0.080000 |
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