Classification of Minasgeraisite-(Y) |
| IMA status: | Approved 1983 |
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| Strunz 8th edition ID: | 8/B.29-40
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| Nickel-Strunz 10th (pending) edition ID: | 9.AJ.20
9 : SILICATES (Germanates) A : Nesosilicates J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4 |
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| Dana 8th edition ID: | 54.2.1b.6
54 : NESOSILICATES Borosilicates and Some Beryllosilicates 2 : Borosilicates and Some Beryllosilicates with B in [4] coordination |
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| Hey's CIM Ref.: | 14.3.15
14 : Silicates not Containing Aluminum 3 : Silicates of Be |
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| mindat.org URL: | http://www.mindat.org/min-2716.html Please feel free to link to this page. |
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Type Occurrence of Minasgeraisite-(Y) |
| Type Locality: | Jaguaraçu pegmatite (José Miranda mine; José Pinto mine; Carneirinho mine), Jaguaraçu, Minas Gerais, Southeast Region, Brazil |
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| Year of Discovery: | 1986 |
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| Geological Setting of type material: | With milarite in late stage crystallization of a granite pegmatite. |
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| Associated Minerals at type locality: | |
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Physical Properties of Minasgeraisite-(Y) |
| Lustre: | Sub-Vitreous, Resinous, Dull |
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| Diaphaneity (Transparency): | Transparent |
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| Comment: | Usually subvitreous, but may form dull fine-grained coatings. |
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| Colour: | Purple to lavender purple |
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| Streak: | Very pale purple |
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| Hardness (Mohs): | 6 - 7 |
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| Tenacity: | Brittle |
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| Cleavage: | Perfect {100}, "a second good cleavage" also noted |
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| Fracture: | Irregular/Uneven |
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| Density (measured): | 4.29 g/cm3 |
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| Density (calculated): | 4.90 g/cm3 |
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| Comment: | Calculated density for theoretically pure material |
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Crystallography of Minasgeraisite-(Y) |
| Crystal System: | Monoclinic |
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| Class (H-M): | 2/m - Prismatic |
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| Space Group: | P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a} |
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| Cell Parameters: | a = 9.833Å, b = 7.562Å, c = 4.702Å β = 90.46° |
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| Ratio: | a:b:c = 1.3 : 1 : 0.622 |
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| Unit Cell Volume: | V 349.62 ų (Calculated from Unit Cell) |
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| Z: | 2 |
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| X-Ray Powder Diffraction: | | d-spacing | | Intensity | | 5.99 | | (30) | | 3.71 | | (30) | | 3.41 | | (30) | | 3.11 | | (100) | | 2.83 | | (100) | | 2.54 | | (90) | | 2.25 | | (30) |
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| Comments: | 39-344 |
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Optical Data of Minasgeraisite-(Y) |
| Type: | Biaxial (+) |
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| RI values: | nα = 1.740 nβ = 1.754 nγ = 1.786 |
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| 2V: | Measured: 50° to 72°, Calculated: 68° |
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| Birefringence: | 0.046 |
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| Maximum Birefringence: | δ = 0.046
 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: | r > v weak |
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| Comments: | Colorless to pale grayish yellow |
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Chemical Properties of Minasgeraisite-(Y) |
| Formula: | |
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| Essential elements: | Be, Ca, O, Si, Y |
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| All elements listed in formula: | Be, Ca, O, Si, Y |
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Relationship of Minasgeraisite-(Y) to other Species |
| Member of Group: | |
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Related Minerals - Nickel-Strunz Grouping):
- + | |
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Related Minerals - Hey's Index Grouping:
- + | |
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Other Names for Minasgeraisite-(Y) |
| Synonyms: | |
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| Other Languages: | |
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Other Information |
| Fluorescence in UV light: | Nonfluorescent in SW or LW UV |
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| 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 Minasgeraisite-(Y) |
| Reference List: | American Mineralogist (1986): 71: 603-607. |
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Internet Links for Minasgeraisite-(Y) |
| Search Engines: |
Look for Minasgeraisite-(Y) on Google
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| External Links: | Look for Minasgeraisite-(Y) on WebmineralLook for Minasgeraisite-(Y) on Athena MineralogyLook for Minasgeraisite-(Y) on WikipediaLook for Minasgeraisite-(Y) on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Minasgeraisite-(Y) in the Natural History Museum (London) online catalogueMinasgeraisite-(Y) details from Handbook of Mineralogy (PDF) |
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| Mineral Dealers: | Wendel Minerals - Auktion & ShopWilensky Fine MineralsWright's Rock Shop - excellent mineral specimens since 1970SpiriferMinerals.com - high quality specimensThe Arkenstone - Fine MineralsSearch for - Minasgeraisite-(Y) - on e-Rocks Mineral Sales & AuctionsMineral Classics - Worldwide Collector Quality Minerals and GemsTop quality minerals from Kristalle of Californiarare and unusual minerals mainly crystallizedFine Minerals from Dan Weinrich MineralsBuy minerals from Mineralium.comFind Minasgeraisite-(Y) on www.crystalclassics.co.uk |
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Localities for Minasgeraisite-(Y) |