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Ishikawaite

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Standpipe Hill Quarries, Topsham, Sagadahoc Co., Maine, USA
© FED '08

Show Ishikawaite Photos (8)
Formula:
U
4+
 
Fe
2+
 
Nb
 
2
O
 
8
System:AmorphousColour:Black
Hardness:5 - 6
Name:Named for the type locality, Ishikawa District, Iwaki Prefecture, Japan.


Originally described as YNbO4 (Kimura, 1922), but redefined by Hanson et al. (1999) as (U,Fe)NbO4. (Mineral is metamict; published data on XRD pattern and cell parameters are for heated material, with no guarantee that the structure restored was the original one.)

Compare also Samarskite Group.

Classification of Ishikawaite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered" 1922
Strunz 8th edition ID:4/D.19-70
Nickel-Strunz 10th (pending) edition ID:4.DB.25

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
Dana 8th edition ID:8.1.4.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4
Hey's CIM Ref.:18.4.4

18 : Niobates and Tantalates
4 : Niobates and tantalates containing both U and rare earths
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Type Occurrence of Ishikawaite

Type Locality:Ishikawa-gun, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan
General Appearance of Type Material:Prismatic orthorhombic-appearing black crystals.
Year of Discovery:1922
Geological Setting of type material:NYF-pegmatite.
Associated Minerals at type locality:
Samarskite-(Y)QuartzColumbite-(Fe)

Physical Properties of Ishikawaite

Lustre:Waxy
Diaphaneity (Transparency):Opaque
Colour:Black
Streak:Dark brown
Hardness (Mohs):5 - 6
Hardness Data:Measured
Cleavage:None Observed
Fracture:Conchoidal
Density (measured):6.2 - 6.4 g/cm3

Crystallography of Ishikawaite

Crystal System:Amorphous
Cell Parameters:a = 5.562Å, b = 9.934Å, c = 5.243Å
β = 93.9°
Ratio:a:b:c = 0.56 : 1 : 0.528
Unit Cell Volume:V 0.00 ų (Calculated from Unit Cell)
Morphology:Tabular crystals {100}.

Chemical Properties of Ishikawaite

Formula:
U
4+
 
Fe
2+
 
Nb
 
2
O
 
8
Essential elements:Fe, Nb, O, U
All elements listed in formula:Fe, Nb, O, U
Empirical Formula:
(U,Y,Fe'',Fe''',Ca)(Nb,Ta,Ti)O
 
4
Common Impurities:Ca,Ce,Ta,Ti,Sn,Si,Th,Mn,Mg,REE

Relationship of Ishikawaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.DB.05Argutite
GeO
 
2
4.DB.05Cassiterite
SnO
 
2
4.DB.05Plattnerite
PbO
 
2
4.DB.05Pyrolusite
MnO
 
2
4.DB.05Rutile
TiO
 
2
4.DB.05Tripuhyite
Fe
3+
 
Sb
5+
 
O
 
4
4.DB.05Tugarinovite
MoO
 
2
4.DB.05Varlamoffite
(Sn,Fe)(O,OH)
 
2
4.DB.10Byströmite
MgSb
 
2
O
 
6
4.DB.10Tapiolite-(Fe)
(Fe,Mn)(Ta,Nb)
 
2
O
 
6
4.DB.10Tapiolite-(Mn)
(Mn,Fe)(Ta,Nb)
 
2
O
 
6
4.DB.10Ordoñezite
ZnSb
 
2
O
 
6
4.DB.15bAkhtenskite
ε-Mn
4+
 
O
 
2
4.DB.15cNsutite
(Mn
4+
 
,Mn
2+
 
)(O,OH)
 
2
4.DB.15aParamontroseite
VO
 
2
4.DB.15aRamsdellite
Mn
4+
 
O
 
2
4.DB.20Scrutinyite
alpha-PbO
 
2
4.DB.25Ixiolite
(Ta,Nb,Sn,Fe,Mn)
 
4
O
 
8
4.DB.25Samarskite-(Y)
(Y,Fe
3+
 
,Fe
2+
 
,U,Th,Ca)
 
2
(Nb,Ta)
 
2
O
 
8
4.DB.25Srilankite
Ti
 
2
ZrO
 
6
4.DB.25Yttrocolumbite-(Y)
Y(U
4+
 
,Fe
2+
 
)Nb
 
2
O
 
8
4.DB.25Calciosamarskite
(Ca,Fe
3+
 
,Y)
 
2
(Nb,Ta,Ti)
 
2
O
 
8
4.DB.25Samarskite-(Yb)
(Yb,Fe
3+
 
)
 
2
(Nb,Ta)
 
2
O
 
8
4.DB.25Písekite-(Y)
4.DB.30Ferberite
FeWO
 
4
4.DB.30Hübnerite
MnWO
 
4
4.DB.30Sanmartinite
(Zn,Fe)WO
 
4
4.DB.30Krasnoselskite
CoWO
 
4
4.DB.30Heftetjernite
ScTaO
 
4
4.DB.30IMA2009-018
MgWO
 
4
4.DB.35Columbite-(Fe)
FeNb
 
2
O
 
6
4.DB.35Tantalite-(Fe)
FeTa
 
2
O
 
6
4.DB.35Columbite-(Mn)
(Mn,Fe)(Nb,Ta)
 
2
O
 
6
4.DB.35Tantalite-(Mn)
MnTa
 
2
O
 
6
4.DB.35Columbite-(Mg)
(Mg,Fe,Mn)(Nb,Ta)
 
2
O
 
6
4.DB.35Qitianlingite
(Fe,Mn)
 
2
(Nb,Ta)
 
2
WO
 
10
4.DB.35Magnocolumbite
4.DB.35Tantalite-(Mg)
(Mg,Fe
2+
 
)(Ta,Nb)
 
2
O
 
6
4.DB.40Ferrowodginite
FeSnTa
 
2
O
 
8
4.DB.40Lithiotantite
Li(Ta,Nb)
 
3
O
 
8
4.DB.40Lithiowodginite
LiTa
 
3
O
 
8
4.DB.40Titanowodginite
MnTiTa
 
2
O
 
8
4.DB.40Wodginite
Mn(Sn,Ta)Ta
 
2
O
 
8
4.DB.40Ferrotitanowodginite
Fe
2+
 
TiTa
 
2
O
 
8
4.DB.40Wolframowodginite
Mn(Mn,Sn,Fe,Ta)(W,Ta,Nb)
 
2
O
 
8
4.DB.45Tivanite
VTiO
 
3
(OH)
4.DB.50Carmichaelite
(Ti,Cr,Fe)[O
 
2-x
(OH)
 
x
]
4.DB.55Alumotantite
AlTaO
 
4
4.DB.60Biehlite
((Sb,As)O)
 
2
[MoO
 
4
]
Related Minerals - Hey's Index Grouping:

- +
18.4.1Uranpyrochlore
(U,Ca,Ce)
 
2
(Nb,Ta)
 
2
O
 
6
(OH,F)
18.4.2Yttrocolumbite-(Y)
Y(U
4+
 
,Fe
2+
 
)Nb
 
2
O
 
8
18.4.3Yttrotantalite-(Y)
(Y,Ca,U
4+
 
,Fe
2+
 
)
 
2
(Ta,Nb)
 
2
O
 
8
18.4.5Euxenite-(Y)
(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)
 
2
O
 
6
18.4.6Tanteuxenite-(Y)
(Y,Ce,Ca)(Ta,Nb,Ti)
 
2
(O,OH)
 
6
18.4.7Kobeite-(Y)
(Y,Zr)
 
2
(Ti,Fe
3+
 
)
 
2
(O,OH)
 
7
18.4.8Polycrase-(Y)
(Y,U)(Ti,Nb)
 
2
O
 
6
18.4.9Yttropyrochlore-(Y)
(Y,Ca,U)
 
1-2
(Nb,Ta,Ti)
 
2
(O,OH)
 
7
18.4.10Calciobetafite
(Ca,RE,Th,U)
 
2
(Nb,Ta,Ti)
 
2
O
 
7
18.4.11Yttrobetafite-(Y)
(Y,U,Ce)
 
2
(Ti,Nb,Ta)
 
2
O
 
6
OH
18.4.12Samarskite-(Y)
(Y,Fe
3+
 
,Fe
2+
 
,U,Th,Ca)
 
2
(Nb,Ta)
 
2
O
 
8

Other Names for Ishikawaite

Other Languages:
German:Ishikawait
Japanese:石川石
Spanish:Ishikawaita

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.

References for Ishikawaite

Reference List:Kimura (1922), Journal of the Geological Society of Tokyo: 29: 316.

Shibata and Kimura (1922), Journal of the Chemical Society of Japan: 43: 301, 648.

Ōhashi (1924), Journal of the Geological Society, Tokyo: 31: 166.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 766.

Hanson, S.L., Simmons, W.B., Falster, A.U., Foord E.E., Litche F.E. (1999): Mineralogical Magazine 63: 27-36. Abstract in American Mineralogist: 84: 1467.

Internet Links for Ishikawaite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Ishikawaite in the Natural History Museum (London) online catalogue
  • Ishikawaite details from Handbook of Mineralogy (PDF)
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    Localities for Ishikawaite

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    China
     
    • Sichuan Province
      • Panzhihua Prefecture
        • Miyi Co.
    		Zhang Peishan, Yang Zhuming, Tao Kejie, and Yang Xueming (1996): \"Mineralogy and Geology of Rare Earths in China\", Science Press (Beijing), 226 pp.
    • Xinjiang (Xinjiang-Uygur) Autonomous Region
      • Yili Hasake (Ili Kazakh) Autonomous Prefecture
        • Aletai (Altay) Prefecture
          • Fuyun Co.
    		http://www.smartminerals.com/cina2004/art_China_localities.htm
    Czech Republic
     
    • Moravia (Mähren; Maehren)
      • South Moravia Region
        • Tišnov
          • Drahonin
    		Škoda, R., Novák, M.: Akcesorické Nb-Ta-Ti minerály z pegmatitu v uranovém dole Drahonín, strážecké moldanubikum. Acta Musei Moraviae, Scientiae geologicae, 2004, roč. 89, s. 55 - 66.
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Fukushima Prefecture
    		Min Mag 63 (1999), 27.
    Alfredo Petrov collection (ex- Bill Pinch collection)
    Alfredo Petrov collection
    Russia
     
    • Urals Region
      • Southern Urals
        • Chelyabinsk Oblast'
          • Ilmen Mts
    		http://www.mindat.org/picshow.php?id=22623&fp=1
    Pavel M. Kartashov data
    USA
     
    • Connecticut
      • Hartford Co.
        • Glastonbury
          • South Glastonbury
      • Middlesex Co.
    		Hanson, S., Jarnot, B. M., Falster, A. U., Simmons, W. B., and Nizamoff, J. W., 2003, Nb-Ta-Ti Oxide Minerals from Two Pegmatites of the Middletown Area, Connecticut, Program with Abstracts, v.30, p. 11.
    • Maine
      • Sagadahoc Co.
        • Topsham
    		Can. Min. Vol. 36, pp.601-608
    King & Foord, 1994. Mineralogy of Maine, V. 1.; King and Foord, 2000, Addenda to Volume 1, Mineralogy of Maine, v. 2.
    King, V. and Foord, E., 1994, Mineralogy of Maine, volume 1; King, V. and Foord, E., 2000, Mineralogy of Maine.
    "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
    King & Foord, 1994. Mineralogy of Maine, V. 1.; King and Foord, 2000, Addenda to Volume 1, Mineralogy of Maine, v. 2.
    King & Foord, 1994. Mineralogy of Maine, V. 1.; King and Foord, 2000, Addenda to Volume 1, Mineralogy of Maine, v. 2.
    King, V. and Foord,E., 1994, 2000, Mineralogy of Maine.
    • New Hampshire
      • Carroll Co.
        • Wakefield
    		Rocks & Min. 80:256 (2005)
    Mineral and/or Locality
    Google
     
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 10th Nov 2009 19:51:57