Classification of Medaite |
| IMA status: | Approved |
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| Strunz 8th edition ID: | 8/C.34-14
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| Nickel-Strunz 10th (pending) edition ID: | 9.BJ.30
9 : SILICATES (Germanates) B : Sorosilicates J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination |
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| Dana 8th edition ID: | 57.4.1.1
57 : SOROSILICATES Si3O10 Groups and Larger Noncyclic Groups 4 : Insular Si3O10 and Larger Noncyclic Groups with groups with 6 or more tetrahedra |
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| Hey's CIM Ref.: | 17.7.5
17 : Silicates Containing other Anions 7 : Silicates with vanadate, arsenate or antimonate |
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| mindat.org URL: | http://www.mindat.org/min-2624.html Please feel free to link to this page. |
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Type Occurrence of Medaite |
| Type Locality: | Molinello Mine, Graveglia Valley, Ne, Genova Province, Liguria, Italy |
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| Place of Conservation of Type Material: | Institute of Mineralogy, Milan, Mineral Museums of Universities of Rome and Oslo, Norway. |
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| Year of Discovery: | 1982 |
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| Geological Setting of type material: | Manganese mine. |
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Physical Properties of Medaite |
| Lustre: | Sub-Adamantine |
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| Diaphaneity (Transparency): | Translucent |
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| Colour: | Brownish-red |
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| Cleavage: | Distinct/Good {100} |
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| Parting: | Distinct normal to elongation |
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| Density (measured): | 3.65 - 3.75 g/cm3 |
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| Density (calculated): | 3.7 g/cm3 |
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Crystallography of Medaite |
| Crystal System: | Monoclinic |
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| Cell Parameters: | a = 6.71Å, b = 28.94Å, c = 7.57Å β = 95.4° |
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| Ratio: | a:b:c = 0.232 : 1 : 0.262 |
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| Unit Cell Volume: | V 1,463.47 ų (Calculated from Unit Cell) |
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Optical Data of Medaite |
| Type: | Biaxial (+) |
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| RI values: | nα = 1.770 nβ = 1.780 nγ = 1.800 |
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| 2V: | Measured: 71° , Calculated: 72° |
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| Maximum Birefringence: | δ = 0.030
 Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
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| Surface Relief: | Very High |
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| Dispersion: | r > v distinct |
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| Pleochroism: | Weak |
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| Comments: | Dark to lighter orange |
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Chemical Properties of Medaite |
| Formula: | |
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| Essential elements: | H, Mn, O, Si, V |
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| All elements listed in formula: | As, Ca, H, Mn, O, Si, V |
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| Common Impurities: | Fe,H2O |
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Relationship of Medaite to other Species |
| Related Minerals - Nickel-Strunz Grouping): | | 9.BJ.05 | Orientite | | | 9.BJ.10 | Rosenhahnite | | | 9.BJ.15 | Trabzonite | | | 9.BJ.20 | Thalénite-(Y) | | | 9.BJ.20 | Fluorthalénite-(Y) | | | 9.BJ.25 | Tiragalloite | | | 9.BJ.35 | Ruizite | | | 9.BJ.40 | Ardennite-(As) | | Mn | | [(Al,Mg) | | ][(OH) | | |(AsO | | ,VO | | )|(SiO | | ) | | |Si | | O | | ] |
| | 9.BJ.40 | Ardennite-(V) | | Mn | | [Al | | (Mg,Al,Fe | | ,Mn | | ) | | ][(OH) | | |(VO | | ,SiO | | )|(SiO | | ) | | |Si | | O | | ] |
| | 9.BJ.45 | Kilchoanite | | | 9.BJ.50 | Kornerupine | | | 9.BJ.50 | Prismatine | | ([ ],Fe,Mg)(Mg,Al,Fe) | | Al | | Si | | (Si,Al) | | (B,Si,Al)(O,OH,F) | | |
| | 9.BJ.55 | Zunyite | | | 9.BJ.60 | Hubeite | | | 9.BJ.65 | Cassagnaite | | (Ca,Mn | | ) | | (Fe | | ,Mn | | ,Al) | | (V | | ,Mg,Al) | | [(O,OH) | | |(OH) | | |(SiO | | ) | | |Si | | O | | ] |
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| Related Minerals - Hey's Index Grouping: | | 17.7.1 | Suzukiite | | | 17.7.2 | Franciscanite | | | 17.7.3 | Kurumsakite | | (Zn,Ni,Cu) | | Al | | V | | Si | | O | | ·27H | | O (or near) |
| | 17.7.4 | Ardennite-(As) | | Mn | | [(Al,Mg) | | ][(OH) | | |(AsO | | ,VO | | )|(SiO | | ) | | |Si | | O | | ] |
| | 17.7.6 | Johninnesite | | | 17.7.7 | Tiragalloite | | | 17.7.8 | Dixenite | | CuMn | | Fe | | [(OH) | | |(AsO | | ) | | |AsO | | |(SiO | | ) | | ] |
| | 17.7.9 | Asbecasite | | | 17.7.10 | Mcgovernite | | | 17.7.11 | Kraisslite | | (Mn | | ,Mg) | | Zn | | [(OH) | | |(AsO | | ) | | |(SiO | | ) | | ] |
| | 17.7.12 | Schallerite | | | 17.7.13 | Nelenite | | | 17.7.14 | Kolicite | | | 17.7.15 | Yeatmanite | | | 17.7.16 | Welshite | | | 17.7.17 | Katoptrite | | | 17.7.18 | Parwelite | | | 17.7.19 | Långbanite | | | 17.7.20 | Chapmanite | | | 17.7.21 | Cervandonite-(Ce) | | (Ce,Nd,La)(Fe,Ti,Al) | | SiAs(Si,As)O | | |
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Other Names for Medaite |
| 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 Medaite |
| Reference List: | American Mineralogist (1982): 67: 85-89.
Acta Crystallographica: 37: 1972-1978.
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Internet Links for Medaite |
| Search Engines: |
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| External Links: | Look for Medaite on WebmineralLook for Medaite on Athena MineralogyLook for Medaite on WikipediaLook for Medaite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Medaite in the Natural History Museum (London) online catalogueMedaite details from Handbook of Mineralogy (PDF) |
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| Mineral Dealers: | Rare and Unusual minerals at Mineralogical Research CompanyFabre Minerals - search for Medaite specimensWilensky Fine MineralsBuy from David K Joyce mineralsFind Medaite on www.crystalclassics.co.ukrare and unusual minerals mainly crystallizedFine Minerals from Dan Weinrich MineralsLapis Mineral MagazinTop quality minerals from Kristalle of CaliforniaHigh-end worldwide specimens & outstanding customer serviceWendel Minerals - Auktion & ShopThe Arkenstone - Fine Minerals |
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| Jobs: | Mining & Geology Jobs |
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Localities for Medaite |