Margarosanite (UV!); Jakobsberg, Nordmark, Sweden; Cab; unique piece
Margarosanite, UV-active, from Jakobsberg, Nordmark, Sweden – cabinet specimen as unique piece
This historic cabinet specimen from the famous Jakobsberg locality contains Margarosanite in a compact habit within the characteristic iron- and manganese-rich host rock. Individual crystals are not visible on this specimen. Instead, the mineral occurs as fine-grained to massive aggregates closely intergrown with the surrounding matrix. The UV activity of Margarosanite is of particular interest and makes this rare calcium lead silicate highly desirable among collectors of fluorescent minerals.
Geology & Origin
Margarosanite is a rare calcium lead silicate with the chemical formula PbCa₂Si₃O₉. The mineral was first described from the classic manganese ore deposits of Jakobsberg near Nordmark, Sweden. These deposits are among the world's most important localities for rare manganese, lead and calcium silicates and have yielded numerous mineral species new to science. Margarosanite forms under high-grade metamorphic conditions and commonly occurs together with other rare silicate minerals. Its fluorescence under ultraviolet light makes specimens from Jakobsberg especially attractive for specialized collectors and fluorescent mineral collections.
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) | 0.500000 |
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