Mineralogy Database

Ishikawaite Mineral Data

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General Ishikawaite Information

Help on Chemical  Formula: Chemical Formula: (U,Fe,Y,Ca)(Nb,Ta)O4 (?)
Help on Composition: Composition: Molecular Weight = 294.45 gm
   Calcium    1.36 %  Ca    1.90 % CaO
   Yttrium    6.04 %  Y     7.67 % Y2O3
   Uranium   24.25 %  U    27.51 % UO2
   Tantalum  15.36 %  Ta   18.76 % Ta2O5
   Niobium   23.66 %  Nb   33.85 % Nb2O5
   Iron       7.59 %  Fe    9.76 % FeO
   Oxygen    21.73 %  O
            ______        ______ 
            100.00 %       99.46 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: U0.3Fe2+0.4Y0.2Ca0.1Nb0.75Ta0.25O4
Help on Environment: Environment: In pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1922
Help on Locality: Locality: Ishikawa, Ivaki Province, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Ishikawaite + Pronunciation Say ISHIKAWAITE
 

Ishikawaite Image

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  Ishikawaite

Comments: Blocky, metamict crystals of ishikawaite.
Location: Spinelli Quarry (Spinelli prospect), South Glastonbury, Hartford Co., Connecticut, USA. Scale: 15x15x10 mm.
© John Betts - Fine Minerals

Ishikawaite Crystallography

Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
 

Physical Properties of Ishikawaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 6.2 - 6.4, Average = 6.3
Help on Diaphaneity: Diaphaneity: Opaque
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 Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Resinous
Help on Streak: Streak: dark brown
 

Optical Properties of Ishikawaite

Help on Optical Data: Optical Data: NCalc= 2.15 - from Gladstone-Dale relationship (KC = 0.1819) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Ishikawaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.51 gm/cc
note: Specific Gravity of Ishikawaite =6.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.003495602
Boson Index = 0.996504398
Help on Photoelectric: Photoelectric: PEIshikawaite = 858.78 barns/electron
U=PEIshikawaite x relectron=4,733.22 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 1,808,443.99 (Gamma Ray American Petroleum Institute Units)
Concentration of Ishikawaite per GRapi unit = 552.96 (PPB)

Ishikawaite 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) 16.82 ± 4.20 grams of pure Ishikawaite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1681.9 ±420.48 grams of pure Ishikawaite .

Estimated Radioactivity from Ishikawaite - very strong
Specimen
Size
Weight/Volume
(Sphere)
*
Calculated
Activity
Bequerols
(Bq)
Calculated
Activity
Curies (Ci)
Estimated
Activity
GR(api)
Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 6.72 cm 43,410,145 1.17E-03 1,808,443.99 594.56
100 gm / 3.12 cm 4,341,015 1.17E-04 180,844.40 59.46
10 gm / 1.45 cm 434,101 1.17E-05 18,084.44 5.95
1 gm / 6.72 mm 43,410 1.17E-06 1,808.44 0.59
0.1 gm / 3.12 mm 4,341 1.17E-07 180.84 0.06
0.01 gm / 1.45 mm 434 1.17E-08 18.08 0.01
0.001 gm / 0.67 mm 43 1.17E-09 1.81 0.00

Weight of pure Ishikawaite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.30 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
 

Ishikawaite Classification

Help on  Dana Class: Dana Class: 08.01.04.01 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.01)where A BO4
  (08.01.04)Dana Group
 
08.01.04.01 Ishikawaite (U,Fe,Y,Ca)(Nb,Ta)O4(?) Unk Ortho
Help on  Strunz Class: Strunz Class: 04.DB.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DB -With medium-sized cations; chains of edge-sharing octahedra
 
04.DB.25 Ixiolite (Ta,Nb,Sn,Mn,Fe)O2 P 2/c 2/m
 
04.DB.25 Ishikawaite (U,Fe,Y,Ca)(Nb,Ta)O4(?) Unk Ortho
 
04.DB.25 Srilankite (Ti,Zr)O2 P bcn 2/m 2/m 2/m
 
04.DB.25 Samarskite-(Y) (Y,Fe,U)(Nb,Ta)5O4 P bcn 2/m 2/m 2/m
 
04.DB.25 Samarskite-(Yb)! (Yb,Y,REE,U,Th,Ca,Fe)(Nb,Ta,Ti)O4 P 2/c 2/m
 
04.DB.25 Yttrocolumbite-(Y) (Y,U,Fe)(Nb,Ta)O4 Unk Ortho
 

Other Ishikawaite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Ishikawaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

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Print or Cut-and-Paste your Ishikawaite Specimen Label here :

Ishikawaite

(U,Fe,Y,Ca)(Nb,Ta)O4 (?)
Dana No: 08.01.04.01 Strunz No: 04.DB.25
Locality:

 

Notes:

 

 
   
 


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