Classification of Tvedalite |
| IMA status: | Approved |
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| Strunz 8th edition ID: | 8/G.07-25
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| Nickel-Strunz 10th (pending) edition ID: | 9.DF.20
9 : SILICATES (Germanates) D : Inosilicates F : Inosilicates with 2-periodic multiple chains |
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| Dana 8th edition ID: | 70.5.2.1
70 : INOSILICATES Column or Tube Structures 5 : Column or Tube Structures with chains linked by Be |
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| Hey's CIM Ref.: | 14.3.19
14 : Silicates not Containing Aluminum 3 : Silicates of Be |
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| mindat.org URL: | http://www.mindat.org/min-4065.html Please feel free to link to this page. |
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Type Occurrence of Tvedalite |
| Type Locality: | Vevja (Bakken) quarry, Tvedalen, Larvik, Vestfold, Norway |
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| General Appearance of Type Material: | Spherulites up to 3 mm in diameter composed of densely packed, radially oriented platelets (a few μ in length). The spherulites are overgrown by a crust of chiavennite. |
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| Year of Discovery: | 1992 |
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| Geological Setting of type material: | In heavily zeolitized and hydrothermally parts of irregular nepheline syenite pegmatites |
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Physical Properties of Tvedalite |
| Lustre: | Vitreous |
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| Diaphaneity (Transparency): | Translucent |
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| Colour: | Creamy-white, light beige |
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| Streak: | white |
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| Hardness (Mohs): | 4½ |
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| Hardness Data: | Estimated |
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| Cleavage: | Perfect {010} |
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| Density (measured): | 2.541 g/cm3 |
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| Density (calculated): | 2.554 g/cm3 |
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Crystallography of Tvedalite |
| Crystal System: | Orthorhombic |
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| Cell Parameters: | a = 8.72Å, b = 23.14Å, c = 4.92Å
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| Ratio: | a:b:c = 0.377 : 1 : 0.213 |
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| Unit Cell Volume: | V 992.76 ų (Calculated from Unit Cell) |
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| X-Ray Powder Diffraction: | | d-spacing | | Intensity | | 11.6 | | (93) | | 5.80 | | (68) | | 3.87 | | (75) | | 3.16 | | (74) | | 2.889 | | (75) | | 2.837 | | (100) |
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Optical Data of Tvedalite |
| Type: | Biaxial |
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| Dispersion: | r > v |
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Chemical Properties of Tvedalite |
| Formula: | |
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| Essential elements: | Be, Ca, H, O, Si |
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| All elements listed in formula: | Be, Ca, H, Mn, O, Si |
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| Common Impurities: | Al,Fe |
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Relationship of Tvedalite to other Species |
Related Minerals - Nickel-Strunz Grouping):
- + | |
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Related Minerals - Hey's Index Grouping:
- + | |
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Other Names for Tvedalite |
| Synonyms: | |
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| Other Languages: | |
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Other Information |
| Fluorescence in UV light: | non-fluorescent |
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| 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 Tvedalite |
| Reference List: | Larsen, A. O., Åsheim, A., Raade, G. & Taftø, J. (1992): Tvedalite, (Ca,Mn)4Be3Si6O17(OH)4•H2O, a new mineral from syenite pegmatite in the Oslo Region, Norway. American Mineralogist: 77: 438-443.
New Minerals (1997), New Minerals 1990-1994.
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Internet Links for Tvedalite |
| Search Engines: |
Look for Tvedalite on Google
Look for Tvedalite images on Google |
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| External Links: | Look for Tvedalite on WebmineralLook for Tvedalite on Athena MineralogyLook for Tvedalite on WikipediaLook for Tvedalite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Tvedalite in the Natural History Museum (London) online catalogueTvedalite details from Handbook of Mineralogy (PDF) |
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Localities for Tvedalite |