Classification of Geigerite |
| IMA status: | Approved 1985 |
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| Strunz 8th edition ID: | 7/C.06-60
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| Nickel-Strunz 10th (pending) edition ID: | 8.CE.05
8 : PHOSPHATES, ARSENATES, VANADATES C : Phosphates without additional anions, with H2O E : With only medium-sized cations, RO4:H2O about 1:2.5 |
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| Dana 8th edition ID: | 39.2.6.2
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES 2 : (AB)5[HXO4]2[XO4]2.xH2O |
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| Hey's CIM Ref.: | 20.8.10
20 : Arsenates (also arsenates with phosphate, but without other anions) 8 : Arsenates of Mn |
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| mindat.org URL: | http://www.mindat.org/min-1669.html Please feel free to link to this page. |
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Type Occurrence of Geigerite |
| Type Locality: | Falotta, Tinizong (Tinzen), Oberhalbstein (Surses; Sursass), Albula Valley, Grischun (Grisons; Graubünden), Switzerland |
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| Year of Discovery: | 1989 |
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Physical Properties of Geigerite |
| Hardness (Mohs): | 3 |
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Crystallography of Geigerite |
| Crystal System: | Triclinic |
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| Cell Parameters: | a = 7.94Å, b = 10.69Å, c = 6.77Å α = 80.97°, β = 84.2°, γ = 81.85° |
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| Ratio: | a:b:c = 0.743 : 1 : 0.633 |
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| Unit Cell Volume: | V 560.3 ų |
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Optical Data of Geigerite |
| Type: | Biaxial (-) |
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| RI values: | nα = 1.601 nβ = 1.630 nγ = 1.660 |
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| 2V: | Measured: 89° , Calculated: 88° |
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| Maximum Birefringence: | δ = 0.059
 Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
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| Surface Relief: | Moderate |
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| Dispersion: | none |
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Chemical Properties of Geigerite |
| Formula: | |
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| Essential elements: | As, H, Mn, O |
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| All elements listed in formula: | As, H, Mn, O |
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Relationship of Geigerite 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 Geigerite |
| Synonyms: | |
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| German names: | |
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| Russian names: | |
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| Spanish names: | |
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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 Geigerite |
| Reference List: | Graeser, S.; Schwander, H.; Bianchi, R.; Pilati, T.; Gramaccioli, C. M. (1989): Geigerite, the manganese analogue of chudobaite: Its description and crystal structure. American Mineralogist: 74, 676-684. |
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Internet Links for Geigerite |
| Search Engines: |
Look for Geigerite on Google
Look for Geigerite images on Google |
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| External Links: | Look for Geigerite on WebmineralLook for Geigerite on Athena MineralogyLook for Geigerite on WikipediaLook for Geigerite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Geigerite in the Natural History Museum (London) online catalogueGeigerite details from Handbook of Mineralogy (PDF) |
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| Mineral Dealers: | Wright's Rock Shop - excellent mineral specimens since 1970Top quality minerals from Kristalle of CaliforniaFind Geigerite on www.crystalclassics.co.ukThe Arkenstone - Fine MineralsRare and Unusual minerals at Mineralogical Research CompanyBuy Minerals and Crystals from Crystalarium.comSearch for Geigerite on minvision.comrare and unusual minerals mainly crystallizedFine Minerals from Dan Weinrich MineralsBuy fine minerals and gemstones from Pala InternationalBuy Fine Minerals from mineralsweb.comWendel Minerals - Auktion & Shop |
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| Jobs: | Mining & Geology Jobs |
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Localities for Geigerite |
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