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Ishikawaite

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Spinelli Quarry (Spinelli prospect), South Glastonbury, Hartford Co., Connecticut, USA
© 2000 John H. Betts

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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.)

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: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.15Akhtenskite
ε-Mn
4+
 
O
 
2
4.DB.15Nsutite
(Mn
4+
 
,Mn
2+
 
)(O,OH)
 
2
4.DB.15Paramontroseite
VO
 
2
4.DB.15Ramsdellite
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.25Iwashiroite-(Y)
Y(Ta,Nb)O
 
4
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.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.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(Ti,Nb)
 
2
O
 
6
18.4.9Yttropyrochlore-(Y)
(Y,Na,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

German names:
Ishikawait
Japanese names:
石川石
Spanish names:
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 ofn the Chemical Society of Japan: 43: 301, 648.

Ōhashi (1924), Jurnal 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
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  • 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.
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    (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
     
    • 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.
    Russia
     
    • Urals Region
      • Southern Urals
        • Chelyabinsk Oblast'
          • Ilmeny (Ilmen; Ilmenskie) Mts
    		http://www.mindat.org/picshow.php?id=22623&fp=1
    USA
     
    • Connecticut
      • Hartford Co.
        • South Glastonbury
    		Rocks & Minerals 79:4 p 255
      • Middlesex Co.
        • Portland
    • 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.
    "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, 1994, 2000, Mineralogy of Maine.
    • New Hampshire
      • Carroll Co.
        • Wakefield
    		Rocks & Min. 80:256 (2005)
    Mineral and/or Locality
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