Classification of Hydroxylborite |
| IMA status: | Approved 2007 |
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| Nickel-Strunz 10th (pending) edition ID: | 6.AB.50
6 : BORATES A : Monoborates B : BO3, with additional anions; 1(D) + OH, etc. |
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| mindat.org URL: | http://www.mindat.org/min-31567.html Please feel free to link to this page. |
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Type Occurrence of Hydroxylborite |
| Type Locality: | Titovskoe B deposit, Tas-Khayakhtakh Range, Dogdo River Basin, Polar Yakutia, Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia |
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| Place of Conservation of Type Material: | Fersman Mineralogical Museum, Moscow (#91968), and the Geology Museum of the All-Russian Scientific Research Institute of Mineral Resources (#M-1663). |
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| Year of Discovery: | 2006 |
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| Associated Minerals at type locality: | |
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Physical Properties of Hydroxylborite |
| Lustre: | Vitreous |
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| Diaphaneity (Transparency): | Transparent |
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| Colour: | Colourless |
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| Streak: | White |
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| Hardness (Mohs): | 3½ |
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| Tenacity: | Brittle |
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| Cleavage: | Imperfect/Fair On {0001}, imperfect. |
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| Density (measured): | 2.89 g/cm3 |
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| Density (calculated): | 2.872 g/cm3 |
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Crystallography of Hydroxylborite |
| Crystal System: | Hexagonal |
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| Class (H-M): | 6/m - Dipyramidal |
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| Space Group: | P63/m |
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| Cell Parameters: | a = 8.912Å, c = 3.112Å
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| Ratio: | a:c = 1 : 0.349 |
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| Unit Cell Volume: | V 214.05 ų |
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| Z: | 2 |
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| Morphology: | Crystals prismatic with dominant {1100} and without distinct terminal faces; also occurs as radial aggregates. |
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Optical Data of Hydroxylborite |
| Type: | Uniaxial (-) |
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| RI values: | nω = 1.566 nε = 1.531 |
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| Maximum Birefringence: | δ = 0.035
 Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
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| Surface Relief: | Low |
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Chemical Properties of Hydroxylborite |
| Formula: | |
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| Essential elements: | |
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| All elements listed in formula: | B, H, Mg, O |
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Relationship of Hydroxylborite to other Species |
| Series: | Forms a series with Fluoborite (see here) |
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| Related Minerals - Nickel-Strunz Grouping): | |
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Other Names for Hydroxylborite |
| Synonyms: | |
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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 Hydroxylborite |
| Reference List: | Rudnev, V.V., Chukanov, N.V., Nechelyustov, G.N., Yamnova, N.A. (2007): Hydroxylborite, Mg3(BO3)(OH)3, a new mineral, and the isomorphous fluoborite-hydroxylborite series. Proceedings of the Russian Mineralogical Society, 136(1), 69-82.
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Internet Links for Hydroxylborite |
| Search Engines: |
Look for Hydroxylborite on Google
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| External Links: | Look for Hydroxylborite on WebmineralLook for Hydroxylborite on Athena MineralogyLook for Hydroxylborite on WikipediaLook for Hydroxylborite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Hydroxylborite in the Natural History Museum (London) online catalogue |
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Localities for Hydroxylborite |