Log In
Thulite from
Mjønes Tunnel, Åstfjorden, Snillfjord, Orkland, Trøndelag, Norway
| Locality type: | Tunnel | |
| Classification | ||
|---|---|---|
| Species: | Zoisite var: Thulite | |
| Formula: | (Ca2)(Al,Mn3+)3(Si2O7)(SiO4)O(OH) | |
| Comments: | By definition, thulite is a pink variety of zoisite with a variable manganese content. The pink zoisite -bearing rock found at Mjønes Tunnel is populary as a whole called thulite. The "Thulite"- rock contains beside a pink variety of zoisite, varying amounts of minerals such as quartz, piemontite, feldspar, and tremolite. PXRD analysis confirms that the pink mineral labelled by collectors as "thulite" is zoisite. SEM/EDS analyses of the pink zoisite indicate 0.1 wt% Mn₂O₃, a relatively low manganese content (Størseth 2019) and Størseth (2019) . In the book "Minerals of Norway" by Lars Olav Kvamsdal (2023) the following is written about the zoisite from Mjønes: "The Mn-content is to low for the mineral to be called thulite (Størseth 2019) and Størseth (2019b)". However, since, by definition thulite is a pink variety of zoisite and it's generally based definition is not based on the content of Mn, but the color, thulite (as the poink variety of zoisite) does occur at Mjønes. | |
| Confirmation | ||
| Validity: | Believed Valid | |
| Associated Minerals Based on Photo Data: | ||
| Quartz | 6 | |
| Epidote | 2 | |
| Feldspar Group | 2 | |
| Apatite | 1 | |
| Calcite | 1 | |
| Pegmatite | 1 | |
| Data | ||
| Mineral Data: | Click here to view Thulite data | |
| Locality Data: | Click here to view Mjønes Tunnel, Åstfjorden, Snillfjord, Orkland, Trøndelag, Norway | |
| Photo Gallery | View Gallery (21 photos) | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 1288254 | |
| Long-form Identifier: | 1:3:1288254:0 | |
| GUID (UUID V4): | 0 | |
| Nearest other occurrences of Thulite | ||
| 52.0km (32.3 miles) | ⓘLeksvik Thulite Quarry, Hindremseter, Leksvik, Indre Fosen, Trøndelag, Norway | |
| References | ||
[1]Størseth, Leif Roger (2019) Nytt thulittfunn i Åstfjorden, Trøndelag [New thulite discovery in Åstfjorden, Trøndelag]. STEIN. Magasin for populærgeologi, 46 (1). 9-17 | ||
Mjønes Tunnel, Åstfjorden, Snillfjord, Orkland, Trøndelag, Norway