Kobeite-(Y) Mineral Data (original) (raw)

General Kobeite-(Y) Information

Help on Chemical Formula: Chemical Formula:

(Y,U)(Ti,Nb)2(O,OH)6 (?)

Help on Composition: Composition:

Molecular Weight = 319.10 gm

Yttrium 25.08 % Y 31.84 % Y2O3

Uranium 7.46 % U 8.46 % UO2

Titanium 22.51 % Ti 37.55 % TiO2

Niobium 14.56 % Nb 20.83 % Nb2O5

Hydrogen 0.32 % H 2.82 % H2O

Oxygen 30.08 % O

______ ______

100.00 % 101.50 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Y0.9U0.1Ti1.5Nb0.5O5(OH)

Help on Environment: Environment:

In granite pegmatites.

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1950

Help on Locality: Locality:

Kobe-Mura [presently Oyama-cho], Japan. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for the locality.

Help on Name Pronunciation: Name Pronunciation:

Kobeite-(Y) Say KOBEITE-(Y)

Kobeite-(Y) Image

Click Here for Larger Kobeite-(Y) Image in a New Browser Window Images:

Click Here for Larger Kobeite-(Y) Image Kobeite-(Y) Comments: Subparallel aggregate of black, tabular, euhedral kobeite-(Y) crystals in matrix. Location: Ohro, Kobe, Kyoto, Japan.Scale: Picture size 5 mm. © Paul M. Schumacher

Kobeite-(Y) Crystallography

Help on Cell Dimensions: Cell Dimensions:

a = 5.021, Z = 1; V = 126.58 Den(Calc)= 4.19

Help on Crystal System: Crystal System:

IsometricSpace Group: Cubic

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 2.89(1), 1.776(0.8), 1.514(0.7),

Physical Properties of Kobeite-(Y)

Help on Cleavage: Cleavage:

None

Help on Color: Color:

Brown, Brownish black, Dark brown, Black.

Help on Density: Density:

4.6

Help on Diaphaneity: Diaphaneity:

Transparent to Translucent

Help on Fracture: Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Help on Habit: Habit:

Metamict - Mineral originally crystalline, now amorphous due to radiation damage.

Help on Habit: Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Help on Habit: Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Help on Hardness: Hardness:

5.5 - Knife Blade

Help on Luster: Luster:

Vitreous - Resinous

Help on Streak: Streak:

reddish brown

Optical Properties of Kobeite-(Y)

Help on Gladstone-Dale: Gladstone-Dale:

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

Help on Optical Data: Optical Data:

Isotropic, n=2.205.

Calculated Properties of Kobeite-(Y)

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=3.86 gm/cc
note: Specific Gravity of Kobeite-(Y) =4.19 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Help on Photoelectric: Photoelectric:

PEKobeite-(Y) = 242.17 barns/electron
U=PEKobeite-(Y) x relectron= 933.62 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 585,029.27 (Gamma Ray American Petroleum Institute Units)
Concentration of Kobeite-(Y) per GRapi unit =1,709.32 (PPB)

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) .
Estimated Maximum U.S. Postal Shipping Size(10 mRem/hr limit, Unshielded 100 cm box) 5199.2 ±1299.8 grams of pure Kobeite-(Y) .

Estimated Radioactivity from Kobeite-(Y) - strong

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor One Hour
1000 gm / 7.70 cm 13,352,475 3.61E-04 585,029.27 192.34
100 gm / 3.57 cm 1,335,248 3.61E-05 58,502.93 19.23
10 gm / 1.66 cm 133,525 3.61E-06 5,850.29 1.92
1 gm / 7.70 mm 13,352 3.61E-07 585.03 0.19
0.1 gm / 3.57 mm 1,335 3.61E-08 58.50 0.02
0.01 gm / 1.66 mm 134 3.61E-09 5.85 0.00
0.001 gm / 0.77 mm 13 3.61E-10 0.59 0.00

Weight of pure Kobeite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.19 gm/cc.*
Goverment Estimate of Average Annual Exposure (360 mRem)**
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem

Kobeite-(Y) Classification

Help on Dana Class: Dana Class:

08.03.12.01 (08)Multiple Oxides with Nb, Ta, and Ti

(08.03)where A (B2O6)

(08.03.12)Dana Group

08.03.12.01 Kobeite-(Y) (Y,U)(Ti,Nb)2(O,OH)6(?) Cubic Cubic

Help on Strunz Class: Strunz Class:

04.DG.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DG -With large (� medium-sized) cations; chains of edge-sharing octahedra

04.DG.05 Fersmite (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 Pcan 2/m 2/m 2/m

04.DG.05 Euxenite-(Y) (Y,Ca,Ce)(Nb,Ta,Ti)2O6 Pcan 2/m 2/m 2/m

04.DG.05 Kobeite-(Y) (Y,U)(Ti,Nb)2(O,OH)6(?) Cubic Cubic

04.DG.05 Loranskite-(Y) (Y,Ce,Ca)ZrTaO6(?) Unk Ortho

04.DG.05 Polycrase-(Y) (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6 Pcan 2/m 2/m 2/m

04.DG.05 Tanteuxenite-(Y) (Y,Ce,Ca)(Ta,Nb,Ti)2(O,OH)6 Pcan 2/m 2/m 2/m

04.DG.05 Uranopolycrase (U,Y)(Ti,Nb,Ta)2O6 P bcn 2/m 2/m 2/m

04.DG.05 Yttrocrasite-(Y) (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 Unk Ortho

Other Kobeite-(Y) Information

Help on References: References:

NAME( AntBidBlaNic3) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(AntBidBlaNic3)

Help on See Also: See Also:

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:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Kobeite-(Y) :

A Bijoux Google Search for Kobeite-(Y)
Adam's Minerals Google Search for Kobeite-(Y)
Cape Minerals Google Search for Kobeite-(Y)
Dakota Matrix Minerals Google Search for Kobeite-(Y)
Excalibur Mineral Corp. Google Search for Kobeite-(Y)
Exceptional Minerals Google Search for Kobeite-(Y)
John Betts Fine Minerals Search for Kobeite-(Y)
McDougall Minerals Google Search for Kobeite-(Y)
Mineral News Website Link
Rock and Mineral Shows Google Search for Kobeite-(Y)
Weinrich Minerals, Inc. Google Search for Kobeite-(Y)

Ask about Kobeite-(Y) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

Print or Cut-and-Paste your Kobeite-(Y) Specimen Label here :

Kobeite-(Y)

(Y,U)(Ti,Nb)2(O,OH)6 (?)
Dana No: 08.03.12.01 Strunz No: 04.DG.05
Locality:

Notes: