Classification of Geminite |
| IMA status: | Approved 1988 |
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| Strunz 8th edition ID: | 7/C.06-30
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| Nickel-Strunz 10th (pending) edition ID: | 8.CB.30
8 : PHOSPHATES, ARSENATES, VANADATES C : Phosphates without additional anions, with H2O B : With only medium-sized cations, RO4:H2O = 1:1 |
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| Dana 8th edition ID: | 40.5.12.1
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES 5 : AXO4·xH2O |
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| Hey's CIM Ref.: | 20.1.7
20 : Arsenates (also arsenates with phosphate, but without other anions) 1 : Arsenates of Cu |
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| mindat.org URL: | http://www.mindat.org/min-1671.html Please feel free to link to this page. |
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Type Occurrence of Geminite |
| Type Locality: | Cap Garonne Mine, Pradet, Var, Provence-Alpes-Côte d'Azur, France |
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| Year of Discovery: | 1990 |
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Physical Properties of Geminite |
| Hardness (Mohs): | 3 - 3½ |
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Crystallography of Geminite |
| Crystal System: | Triclinic |
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| Cell Parameters: | a = 6.63Å, b = 8.11Å, c = 15.73Å α = 92.01°, β = 93.87°, γ = 95.02° |
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| Ratio: | a:b:c = 0.818 : 1 : 1.94 |
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| Unit Cell Volume: | V 839.91 ų (Calculated from Unit Cell) |
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Optical Data of Geminite |
| Type: | Biaxial (+) |
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| RI values: | nα = 1.656 nβ = 1.692 nγ = 1.770 |
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| 2V: | Measured: 75° , Calculated: 72° |
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| Maximum Birefringence: | δ = 0.114
 Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
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| Surface Relief: | High |
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| Dispersion: | weak |
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Chemical Properties of Geminite |
| Formula: | |
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| Essential elements: | As, Cu, H, O |
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| All elements listed in formula: | As, Cu, H, O |
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Relationship of Geminite 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 Geminite |
| 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 Geminite |
| Reference List: | New Minerals (1997), New Minerals 1990-1994.
Schweizerische mineralogische und petrographische Mitteilungen: 70: 309-314.
Canadian Mineralogist: 33: 1111-1118.
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Articles/Blogs about Geminite |
Internet Links for Geminite |
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| External Links: | Look for Geminite on WebmineralLook for Geminite on Athena MineralogyLook for Geminite on WikipediaLook for Geminite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Geminite in the Natural History Museum (London) online catalogueGeminite details from Handbook of Mineralogy (PDF) |
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| Mineral Dealers: | Search for - Geminite - on e-Rocks Mineral Sales & AuctionsBuy from David K Joyce mineralsFine Minerals from Dan Weinrich MineralsSearch for Geminite on minvision.comRare and Unusual minerals at Mineralogical Research CompanyFabre Minerals - search for Geminite specimensWright's Rock Shop - excellent mineral specimens since 1970Search for Geminite at Thames Valley MineralsFind Geminite on www.crystalclassics.co.ukMineral Classics - Worldwide Collector Quality Minerals and GemsBuy Minerals and Crystals from Crystalarium.comTop quality minerals from Kristalle of California |
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| Jobs: | Mining & Geology Jobs |
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Localities for Geminite |