| Formula: | | [(Na,K)][Fe | | ][Al | | ][(OH) | | |F|(BO | | ) | | |Si | | O | | ] |
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| System: | Trigonal |
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The F-analogue of
schorl.
Apparently not really uncommon (Kolitsch & Ertl, unpubl. results).
First reported from Grasstein, Trentino – South Tyrol, Italy.
The final name of this species will depend on the consensus reached by an IMA Subcommittee on tourmaline nomenclature (final report expected around 2009).
Classification of Unnamed (F-analogue of Schorl) |
| IMA status: | Not Approved |
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| Strunz 8th edition ID: | 8/E.19-
8 : Silicates E : Cyclosilicates, triplet rings [Si3O9]6- 19 : Tourmaline group |
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| mindat.org URL: | http://www.mindat.org/min-29118.html Please feel free to link to this page. |
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Crystallography of Unnamed (F-analogue of Schorl) |
| Crystal System: | Trigonal |
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| Class (H-M): | 3m - Ditrigonal Pyramidal |
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| Space Group: | R3m |
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| Cell Parameters: | a = 15.997(2) Å, c = 7.179(1) Å
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| Ratio: | a:c = 1 : 0.449 |
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| Unit Cell Volume: | V 1591 ų |
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| Z: | 3 |
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Chemical Properties of Unnamed (F-analogue of Schorl) |
| Formula: | | [(Na,K)][Fe | | ][Al | | ][(OH) | | |F|(BO | | ) | | |Si | | O | | ] |
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| Essential elements: | Al, B, F, Fe, H, Na, O, Si |
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| All elements listed in formula: | Al, B, F, Fe, H, K, Na, O, Si |
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Relationship of Unnamed (F-analogue of Schorl) to other Species |
Related Minerals - Strunz Grouping):
- + | |
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Other Information |
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. |
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References for Unnamed (F-analogue of Schorl) |
| Reference List: | A. Ertl, U. Kolitsch, S. Prowatke, M. D. Dyar and D. J. Henry (2006): The F-analogue of schorl from Grasstein, Trentino – South Tyrol, Italy: crystal structure and chemistry. Eur. J. Mineral. 18, 583-588. |
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Internet Links for Unnamed (F-analogue of Schorl) |
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Localities for Unnamed (F-analogue of Schorl) |
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the  symbol to view information about a locality.
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