Topaz xls; Thomas Range, Utah, USA; Gerd Tremmel collection; 6 TN as unique piece
Topaz crystals from Thomas Range, Utah, USA, Gerd Tremmel collection – 6 micromount as unique piece
These six micromounts show Topaz crystals from the Thomas Range, Utah, USA, from the Gerd Tremmel collection. The transparent to slightly honey colored Topaz crystals are predominantly prismatic with clearly developed terminations and sharp edges. They are situated on a light colored rhyolitic matrix with a finely crystalline, partly drusy surface that distinctly highlights the crystals. The combination of defined crystal form, vitreous luster, and warm color tones gives each specimen a balanced and structured overall appearance.
Geology & Origin
The Thomas Range in Utah is a classic locality for Topaz associated with highly evolved, fluorine rich rhyolites. Crystallization occurred in gas rich cavities during the late cooling stages of silica rich volcanic rocks, where fluorine bearing fluids promoted the development of well formed Topaz crystals. The region is internationally known for its clear, well shaped crystals, representing typical pneumatolytic to hydrothermal formation conditions in a volcanic environment.
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) | 0.200000 |
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