Classification of Rankamaite |
| IMA status: | Approved |
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| Strunz 8th edition ID: | 4/D.27-40
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| Nickel-Strunz 10th (pending) edition ID: | 4.DM.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates) D : Metal: Oxygen = 1:2 and similar M : With large (+- medium-sized) cations; unclassified |
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| Dana 8th edition ID: | 8.7.6.1
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM 7 : Miscellaneous |
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| Hey's CIM Ref.: | 18.1.7
18 : Niobates and Tantalates 1 : Niobates and tantalates containing neither rare earths nor U |
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| mindat.org URL: | http://www.mindat.org/min-3362.html Please feel free to link to this page. |
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Type Occurrence of Rankamaite |
| Type Locality: | Mumba cassiterite gravels, Mumba, Masisi Mts, Nord-Kivu, Democratic Republic of Congo (Zaïre) |
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| Year of Discovery: | 1969 |
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Physical Properties of Rankamaite |
| Colour: | Creamy-white |
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| Hardness (Mohs): | 3 - 4 |
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Crystallography of Rankamaite |
| Crystal System: | Orthorhombic |
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| Cell Parameters: | a = 17.19Å, b = 17.7Å, c = 3.93Å
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| Ratio: | a:b:c = 0.971 : 1 : 0.222 |
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| Unit Cell Volume: | V 1,195.75 ų (Calculated from Unit Cell) |
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Optical Data of Rankamaite |
| Type: | Biaxial |
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| Dispersion: | r < v extreme |
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Chemical Properties of Rankamaite |
| Formula: | | (Na,K,Pb,Li) | | (Ta,Nb,Al) | | (O,OH) | | |
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| Essential elements: | Na, O, Ta |
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| All elements listed in formula: | Al, H, K, Li, Na, Nb, O, Pb, Ta |
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Relationship of Rankamaite 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 Rankamaite |
| Synonyms: | |
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| Other Languages: | |
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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 Rankamaite |
| Reference List: | American Mineralogist (1970): 55: 1814.
Mineralogicheskii Zhurnal (1984): 6: 42-55.
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Articles/Blogs about Rankamaite |
Internet Links for Rankamaite |
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| External Links: | Look for Rankamaite on WebmineralLook for Rankamaite on Athena MineralogyLook for Rankamaite on WikipediaLook for Rankamaite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Rankamaite in the Natural History Museum (London) online catalogueRankamaite details from Handbook of Mineralogy (PDF) |
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| Mineral Dealers: | Search for - Rankamaite - on e-Rocks Mineral Sales & AuctionsSearch for Rankamaite at Thames Valley MineralsFabre Minerals - search for Rankamaite specimensFine Minerals from Dan Weinrich MineralsLapis Mineral MagazinBuy Minerals and Crystals from Crystalarium.comSearch for Rankamaite on minvision.comBuy minerals from Mineralium.comBuy fine minerals and gemstones from Pala InternationalTop quality minerals from Kristalle of CaliforniaThe Arkenstone - Fine MineralsMineral Classics - Worldwide Collector Quality Minerals and Gems |
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Localities for Rankamaite |