[Newest Minerals] [Minerals for Sale] [Educational Articles] [About Us] [Image Gallery] John Betts - Fine Minerals Classic minerals, out-of-print books & magazines, plus informative articles for collectors General Kobeite-(Y) Information(Y,U)(Ti,Nb)2(O,OH)6 (?) |
Molecular Weight = 319.10 gm |
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Yttrium 25.08 % Y 31.84 % Y2O3 |
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Uranium 7.46 % U 8.46 % UO2 |
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Titanium 22.51 % Ti 37.55 % TiO2 |
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Niobium 14.56 % Nb 20.83 % Nb2O5 |
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Hydrogen 0.32 % H 2.82 % H2O |
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Oxygen 30.08 % O |
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______ ______ |
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100.00 % 101.50 % = TOTAL OXIDE |
Y0.9U0.1Ti1.5Nb0.5O5(OH) |
In granite pegmatites. |
Valid Species (Pre-IMA) 1950 |
Kobe-Mura [presently Oyama-cho], Japan. Link to MinDat.org Location Data. |
Named for the locality. |
Kobeite-(Y) |
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Kobeite-(Y) Crystallographya = 5.021, Z = 1; V = 126.58 Den(Calc)= 4.19 |
IsometricSpace Group: Cubic |
By Intensity(I/Io): 2.89(1), 1.776(0.8), 1.514(0.7), |
| Physical Properties of Kobeite-(Y)None |
Brown, Brownish black, Dark brown, Black. |
4.6 |
Transparent to Translucent |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
Metamict - Mineral originally crystalline, now amorphous due to radiation damage. |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
5.5 - Knife Blade |
Vitreous - Resinous |
reddish brown |
| Optical Properties of Kobeite-(Y)CI meas= 0.049 (Good) - where the CI = (1-KPDmeas/KC) |
CI calc= -0.044 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2876,KPDmeas= 0.262,KC= 0.2756 Ncalc = 2.15 - 2.27 Isotropic, n=2.205. |
| Calculated Properties of Kobeite-(Y)Bulk Density (Electron Density)=3.86 gm/cc |
note: Specific Gravity of Kobeite-(Y) =4.19 gm/cc. Fermion Index = 0.02 |
Boson Index = 0.98 PEKobeite-(Y) = 242.17 barns/electron |
U=PEKobeite-(Y) x relectron= 933.62 barns/cc. |
GRapi = 585,029.27 (Gamma Ray American Petroleum Institute Units)
Kobeite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram. Estimated Maximum U.S. Postal Shipping Size
(10 mRem/hr limit, Unshielded 10 cm box)
51.99 ± 13.00 grams of pure Kobeite-(Y) .
Weight of pure Kobeite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.19 gm/cc.* | Kobeite-(Y) Classification08.03.12.01 (08)Multiple Oxides with Nb, Ta, and Ti |
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(08.03)where A (B2O6) |
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(08.03.12)Dana Group |
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04.DG.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.D - Metal:Oxygen = 1:2 and similar |
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04.DG -With large (± medium-sized) cations; chains of edge-sharing octahedra |
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| Other Kobeite-(Y) InformationNAME( AntBidBlaNic3) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(AntBidBlaNic3) |
Links to other databases for Kobeite-(Y) : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - GeoScienceWorld 5 - Google Images 6 - Google Scholar 7 - Handbook of Mineralogy (UofA) 8 - MinDAT 9 - Mineralienatlas (Deutsch) 10 - Online Mineral Museum 11 - QUT Mineral Atlas 12 - Ruff.Info Search for Kobeite-(Y) using: Visit our Advertisers for Kobeite-(Y) : B & L Fine MineralsDan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Excalibur Minerals Exceptional Minerals Fabre Minerals John Betts Fine Minerals Lapis Mineral Journal Mineral News UV Tools Wrights Rock Shop Translate Kobeite-(Y) Mineral Data : Ask about Kobeite-(Y) here : Print or Cut-and-Paste your Kobeite-(Y) Specimen Label here :
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