Classification of Chromdravite |
| IMA status: | Approved |
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| Strunz 8th edition ID: | 8/E.19-30
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| Nickel-Strunz 10th (pending) edition ID: | 9.CK.05
9 : SILICATES (Germanates) C : Cyclosilicates K : [Si6O18]12- 6-membered single rings, with insular complex anions |
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| Dana 7th edition ID: | 61.3.1.13 |
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| Dana 8th edition ID: | 61.3.1.11
61 : CYCLOSILICATES Six-Membered Rings 3 : Six-Membered Rings with borate groups |
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| Hey's CIM Ref.: | 17.5.37
17 : Silicates Containing other Anions 5 : Borosilicates |
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| mindat.org URL: | http://www.mindat.org/min-1031.html Please feel free to link to this page. |
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Type Occurrence of Chromdravite |
| Type Locality: | Onega trough, Karelia Republic, Northern Region, Russia |
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| Year of Discovery: | 1983 |
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Physical Properties of Chromdravite |
| Lustre: | Vitreous, Resinous |
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| Colour: | Dark emerald-green to greenish-black. |
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| Streak: | Greyish-green. |
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| Hardness (Mohs): | 7 - 7½ |
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Crystallography of Chromdravite |
| Crystal System: | Trigonal |
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| Cell Parameters: | a = 16.11Å, c = 7.27Å
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| Ratio: | a:c = 1 : 0.451 |
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| Unit Cell Volume: | V 1,634.02 ų (Calculated from Unit Cell) |
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Optical Data of Chromdravite |
| Type: | Uniaxial (-) |
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| RI values: | nω = 1.778 nε = 1.772 |
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| Maximum Birefringence: | δ = 0.006
 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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Chemical Properties of Chromdravite |
| Formula: | | [Na][Mg | | ][(Cr | | ,Fe | | ) | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
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| Essential elements: | B, Cr, H, Mg, Na, O, Si |
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| All elements listed in formula: | B, Cr, Fe, H, Mg, Na, O, Si |
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| Common Impurities: | Mn,Ti,V,Al,V,Ca |
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Relationship of Chromdravite to other Species |
| Member of: | Tourmaline Group |
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| Related Minerals - Nickel-Strunz Grouping): | | 9.CK.05 | Buergerite | | [Na][Fe | | ][Al | | ][O | | |F|(BO | | ) | | |Si | | O | | ] |
| | 9.CK.05 | Dravite | | [Na][Mg | | ][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 9.CK.05 | Elbaite | | [Na][(Li,Al) | | ][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 9.CK.05 | Feruvite | | [Ca][(Fe | | ,Mg) | | ][MgAl | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 9.CK.05 | Foitite | | [ ][Fe | | (Al,Fe | | )][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 9.CK.05 | Liddicoatite | | [Ca][Li | | Al][Al | | ][(OH) | | |F|(BO | | ) | | |Si | | O | | ] |
| | 9.CK.05 | Olenite | | ([ ],Na)[(Al,Li) | | ][Al | | ][(O,OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 9.CK.05 | Povondraite | | [Na][Fe | | ][Fe | | ][O | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 9.CK.05 | Schorl | | [Na][Fe | | ][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 9.CK.05 | Uvite | | [Ca][(Mg,Fe | | ) | | ][MgAl | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 9.CK.05 | Magnesiofoitite | | [ ][Mg | | (Al,Fe | | )][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 9.CK.05 | Rossmanite | | [ ][LiAl | | ][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 9.CK.05 | Vanadiumdravite | | [Na][Mg | | ][V | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 9.CK.05 | Oxy-Dravite | | Na (MgAl | | )(MgAl | | )Si | | O | | (BO | | ) | | (OH) | | O |
| | 9.CK.05 | Oxy-rossmanite | | [ ][LiAl | | ]Al | | (BO | | ) | | [Si | | O | | ](OH) | | (O) |
| | 9.CK.10 | Abenakiite-(Ce) | | | 9.CK.15 | Scawtite | | | 9.CK.20 | Steenstrupine-(Ce) | | Na | | Mn | | (Fe | | ,Mn | | ) | | Ce | | (Zr,Th)[(OH) | | |HPO | | |(PO | | ) | | |(Si | | O | | ) | | ]·2H | | O |
| | 9.CK.20 | Thorosteenstrupine | |
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| Related Minerals - Hey's Index Grouping: | | 17.5.1 | Manandonite | | | 17.5.2 | Reedmergnerite | | | 17.5.3 | Searlesite | | | 17.5.4 | Olenite | | ([ ],Na)[(Al,Li) | | ][Al | | ][(O,OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 17.5.5 | Elbaite | | [Na][(Li,Al) | | ][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 17.5.6 | Kalborsite | | | 17.5.7 | Boromuscovite | | | 17.5.8 | Poudretteite | | | 17.5.9 | Liddicoatite | | [Ca][Li | | Al][Al | | ][(OH) | | |F|(BO | | ) | | |Si | | O | | ] |
| | 17.5.10 | Datolite | | | 17.5.11 | Danburite | | | 17.5.12 | Howlite | | | 17.5.13 | Bakerite | | | 17.5.14 | Oyelite | | | 17.5.15 | Kornerupine | | | 17.5.16 | Harkerite | | Ca | | Mg | | Al | | Si | | (O,OH) | | (BO | | ) | | (CO | | ) | | (H | | O,Cl) |
| | 17.5.17 | Serendibite | | (Ca,Na) | | (Mg,Fe | | ) | | (Al,Fe | | ) | | [O | | |(Si,Al,B) | | O | | ] |
| | 17.5.18 | Stillwellite-(Ce) | | | 17.5.19 | Tadzhikite-(Ce) | | (Ca,Ce) | | (Ca,Y) | | (Ti | | ,Fe | | ,Al)[B | | Si | | O | | (O,OH) | | ](OH) | | |
| | 17.5.20 | Melanocerite-(Ce) | | | 17.5.21 | Okanoganite-(Y) | | | 17.5.22 | Tritomite-(Ce) | | (Ce,La,Y,Th) | | (Si,B) | | (O,OH,F) | | |
| | 17.5.23 | Tritomite-(Y) | | (Y,Ca,La,Fe) | | (Si,B,Al) | | (O,OH,F) | | |
| | 17.5.24 | Cappelenite-(Y) | | | 17.5.25 | Dumortierite | | | 17.5.26 | Holtite | | | 17.5.27 | Dravite | | [Na][Mg | | ][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 17.5.28
| Ferridravite | | | 17.5.29 | Axinite-(Mg) | | | 17.5.30 | Uvite | | [Ca][(Mg,Fe | | ) | | ][MgAl | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 17.5.31 | Garrelsite | | | 17.5.32 | Tienshanite | | | 17.5.33 | Leucosphenite | | | 17.5.34 | Taramellite | | | 17.5.35 | Titantaramellite | | | 17.5.36 | Nagashimalite | | | 17.5.38 | Wawayandaite | | | 17.5.39 | Werdingite | | | 17.5.40 | Axinite-(Mn) | | | 17.5.41 | Axinite | | | 17.5.42 | Tinzenite | | | 17.5.44 | Schorl | | [Na][Fe | | ][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 17.5.45 | Buergerite | | [Na][Fe | | ][Al | | ][O | | |F|(BO | | ) | | |Si | | O | | ] |
| | 17.5.46 | Feruvite | | [Ca][(Fe | | ,Mg) | | ][MgAl | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 17.5.47 | Axinite-(Fe) | | | 17.5.48 | Homilite | | | 17.5.49 | Grandidierite | | | 17.5.50 | Hyalotekite | | (Ba,Pb,Ca,K) | | (B,Si,Al) | | (Si,Be) | | O | | (F,Cl) |
| | 17.5.51 | Hellandite-(Y) | |
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| Related Minerals - Dana Grouping): | | 61.3.1.1 | Foitite | | [ ][Fe | | (Al,Fe | | )][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 61.3.1.2 | Magnesiofoitite | | [ ][Mg | | (Al,Fe | | )][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 61.3.1.3 | Rossmanite | | [ ][LiAl | | ][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 61.3.1.4 | Liddicoatite | | [Ca][Li | | Al][Al | | ][(OH) | | |F|(BO | | ) | | |Si | | O | | ] |
| | 61.3.1.5 | Uvite | | [Ca][(Mg,Fe | | ) | | ][MgAl | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 61.3.1.6 | Feruvite | | [Ca][(Fe | | ,Mg) | | ][MgAl | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 61.3.1.7 | Buergerite | | [Na][Fe | | ][Al | | ][O | | |F|(BO | | ) | | |Si | | O | | ] |
| | 61.3.1.8 | Povondraite | | [Na][Fe | | ][Fe | | ][O | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 61.3.1.9 | Olenite | | ([ ],Na)[(Al,Li) | | ][Al | | ][(O,OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 61.3.1.10 | Elbaite | | [Na][(Li,Al) | | ][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 61.3.1.11 | Dravite | | [Na][Mg | | ][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 61.3.1.12 | Schorl | | [Na][Fe | | ][Al | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
| | 61.3.1.14 | Vanadiumdravite | | [Na][Mg | | ][V | | ][(OH) | | |OH|(BO | | ) | | |Si | | O | | ] |
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Other Names for Chromdravite |
| 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 Chromdravite |
| Reference List: | American Mineralogist (1984): 69: 210.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
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Internet Links for Chromdravite |
| Search Engines: |
Look for Chromdravite on Google
Look for Chromdravite images on Google |
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| External Links: | Look for Chromdravite on WebmineralLook for Chromdravite on Athena MineralogyLook for Chromdravite on WikipediaLook for Chromdravite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Chromdravite in the Natural History Museum (London) online catalogueChromdravite details from Handbook of Mineralogy (PDF) |
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| Mineral Dealers: | Search for Chromdravite at Thames Valley MineralsTop quality minerals from Kristalle of CaliforniaFabre Minerals - search for Chromdravite specimensRare and Unusual minerals at Mineralogical Research CompanyThe Arkenstone - Fine MineralsMineral Classics - Worldwide Collector Quality Minerals and GemsBuy Fine Minerals from mineralsweb.comrare and unusual minerals mainly crystallizedFine Minerals from Dan Weinrich MineralsBuy fine minerals and gemstones from Pala InternationalBuy from David K Joyce mineralsLapis Mineral Magazin |
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| Jobs: | Mining & Geology Jobs |
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Localities for Chromdravite |