Ishikawaite
A valid IMA mineral species - grandfathered
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About Ishikawaite
Formula:
U4+Fe2+Nb2O8
Colour:
Black
Lustre:
Sub-Adamantine, Vitreous, Sub-Vitreous, Resinous, Waxy
Hardness:
5 - 6
Specific Gravity:
6.2 - 6.4
Crystal System:
Monoclinic
Member of:
Name:
Originally described as YNbO4 in 1922 by Yuji Shibata and Kenjiro Kimura for the type locality Ishikawa pegmatite district, Fukushima Prefecture, Japan. 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.)
Type Locality:
Ishikawaite is sometimes coated by brown to red brown surface alterations. May partially or completely be metamict.
Unique Identifiers
Mindat ID:
2050
Long-form identifier:
mindat:1:1:2050:9
GUID
(UUID V4):
(UUID V4):
9205f330-d920-4dee-addd-3ef72ae09ce6
IMA Classification of Ishikawaite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
(U,Fe,Y)NbO4
First published:
1922
Classification of Ishikawaite
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
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
8.1.4.1
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4
18.4.4
18 : Niobates and Tantalates
4 : Niobates and tantalates containing both U and rare earths
18 : Niobates and Tantalates
4 : Niobates and tantalates containing both U and rare earths
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Ikw | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Ishikawaite
Sub-Adamantine, Vitreous, Sub-Vitreous, Resinous, Waxy
Transparency:
Translucent, Opaque
Comment:
Broken surfaces are generally vitreous to sub-adamantine. Thin splinters may show smoky brown translucency.
Colour:
Black
Streak:
Dark brown; black
Hardness:
5 - 6 on Mohs scale
Hardness Data:
Measured
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
6.2 - 6.4 g/cm3 (Measured)
Chemistry of Ishikawaite
Mindat Formula:
U4+Fe2+Nb2O8
Elements listed:
Common Impurities:
Ca,Ce,Ta,Ti,Sn,Si,Th,Mn,Mg,REE
Crystallography of Ishikawaite
Crystal System:
Monoclinic
Cell Parameters:
a = 5.562 Å, b = 9.934 Å, c = 5.243 Å
β = 93.9°
β = 93.9°
Ratio:
a:b:c = 0.56 : 1 : 0.528
Unit Cell V:
289.02 ų (Calculated from Unit Cell)
Morphology:
Black rod-like to somewhat bladed crystals {100}. Anhedral masses.
Forms include c{001}, a{100}, s{210}, h{320}, m{110}, n{140}, b{010}, r{144}, and d{101}.
Forms include c{001}, a{100}, s{210}, h{320}, m{110}, n{140}, b{010}, r{144}, and d{101}.
Comment:
usually metamict
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.972 Å | (100) |
| 3.103 Å | (98) |
| 3.73 Å | (38) |
| 2.615 Å | (30) |
| 2.476 Å | (28) |
| 2.819 Å | (26) |
| 3.60 Å | (22) |
Comments:
Metamict. Published data given for heated material; no guarantee that the original structure was restored!
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Geological Setting:
Granite pegmatite
Type Occurrence of Ishikawaite
General Appearance of Type Material:
Prismatic orthorhombic-appearing black crystals.
Place of Conservation of Type Material:
No designated type material.
Geological Setting of Type Material:
NYF-pegmatite.
Associated Minerals at Type Locality:
Other Language Names for Ishikawaite
Relationship of Ishikawaite to other Species
Member of:
Other Members of this group:
| Calciosamarskite | (Ca,U4+)Fe3+(Nb,Ta,Ti)2O8 | Orth. mmm (2/m 2/m 2/m) |
| Samarskite-(Y) | YFe3+Nb2O8 | Mon. 2/m : P2/b |
| Samarskite-(Yb) | YbFe3+(Nb,Ta)2O8 | Mon. 2/m : P2/b |
| Shakhdaraite-(Y) | ScYNb2O8 | Mon. 2/m : P2/b |
| Srilankite | ZrTi2O6 | Orth. mmm (2/m 2/m 2/m) : Pbcn |
| Yttrotantalite-(Y) | (Y,U,Fe2+)(Ta,Nb)(O,OH)4 | Orth. |
Chemically related to group(s):
| Samarskite Group | A3+B3+C5+2O8 |
Common Associates
Associated Minerals Based on Photo Data:
| 9 photos of Ishikawaite associated with Columbite-(Fe) | Fe2+Nb2O6 |
| 4 photos of Ishikawaite associated with Microcline | K(AlSi3O8) |
| 4 photos of Ishikawaite associated with Quartz | SiO2 |
| 2 photos of Ishikawaite associated with Corundum | Al2O3 |
| 1 photo of Ishikawaite associated with Monazite-(Ce) | Ce(PO4) |
| 1 photo of Ishikawaite associated with Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| 1 photo of Ishikawaite associated with Annite | KFe2+3(AlSi3O10)(OH)2 |
| 1 photo of Ishikawaite associated with Albite | Na(AlSi3O8) |
| 1 photo of Ishikawaite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
| 1 photo of Ishikawaite associated with Nontronite | Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O |
Related Minerals - Strunz-mindat Grouping
| 4.DB. | Nioboheftetjernite | ScNbO4 |
| 4.DB. | Shakhdaraite-(Y) | ScYNb2O8 |
| 4.DB. | Nioboixiolite-(Mn2+) | (Nb0.67Mn2+0.33)O2 |
| 4.DB. | Nioboixiolite-([]) | (Nb0.8◻0.2)4+O2 |
| 4.DB.05 | Argutite | GeO2 |
| 4.DB.05 | Cassiterite | SnO2 |
| 4.DB.05 | Plattnerite | PbO2 |
| 4.DB.05 | Pyrolusite | Mn4+O2 |
| 4.DB.05 | Rutile | TiO2 |
| 4.DB.05 | Tripuhyite | Fe3+Sb5+O4 |
| 4.DB.05 | Tugarinovite | MoO2 |
| 4.DB.05 | Varlamoffite | (Sn,Fe)(O,OH)2 |
| 4.DB.10 | Byströmite | MgSb2O6 |
| 4.DB.10 | Tapiolite-(Fe) | Fe2+Ta2O6 |
| 4.DB.10 | Tapiolite-(Mn) | Mn2+Ta2O6 |
| 4.DB.10 | Ordoñezite | ZnSb2O6 |
| 4.DB.10 | Tredouxite | NiSb2O6 |
| 4.DB.15b | Akhtenskite | ε-Mn4+O2 |
| 4.DB.15c | Nsutite | (Mn4+,Mn2+)(O,OH)2 |
| 4.DB.15a | Paramontroseite | V4+O2 |
| 4.DB.15a | Ramsdellite | Mn4+O2 |
| 4.DB.20 | Scrutinyite | α-PbO2 |
| 4.DB.25 | Samarskite-(Y) | YFe3+Nb2O8 |
| 4.DB.25 | Srilankite | ZrTi2O6 |
| 4.DB.25 | Yttrocolumbite-(Y) | Y(U4+,Fe2+)Nb2O8 |
| 4.DB.25 | Calciosamarskite | (Ca,U4+)Fe3+(Nb,Ta,Ti)2O8 |
| 4.DB.25 | Samarskite-(Yb) | YbFe3+(Nb,Ta)2O8 |
| 4.DB.25 | Ixiolite-(Fe2+) | (Ta0.67Fe2+0.33)O2 |
| 4.DB.25 | Ixiolite-(Mn2+) | (Ta0.67Mn2+0.33)O2 |
| 4.DB.30 | Ferberite | FeWO4 |
| 4.DB.30 | Hübnerite | MnWO4 |
| 4.DB.30 | Sanmartinite | (Zn,Fe)WO4 |
| 4.DB.30 | Krasnoselskite | CoWO4 |
| 4.DB.30 | Heftetjernite | ScTaO4 |
| 4.DB.30 | Huanzalaite | MgWO4 |
| 4.DB.30 va | Wolframite Group | |
| 4.DB.30 | Rossovskyite | (Fe3+,Ta)(Nb,Ti)O4 |
| 4.DB.35 | Columbite-(Fe) | Fe2+Nb2O6 |
| 4.DB.35 | Tantalite-(Fe) | Fe2+Ta2O6 |
| 4.DB.35 | Columbite-(Mn) | Mn2+Nb2O6 |
| 4.DB.35 | Tantalite-(Mn) | Mn2+Ta2O6 |
| 4.DB.35 | Columbite-(Mg) | (Mg,Fe,Mn)(Nb,Ta)2O6 |
| 4.DB.35 | Qitianlingite | (Fe,Mn)2(Nb,Ta)2WO10 |
| 4.DB.35 | Tantalite-(Mg) | (Mg,Fe2+)(Ta,Nb)2O6 |
| 4.DB.40 | Ferrowodginite | Fe2+Sn4+Ta2O8 |
| 4.DB.40 | Lithiotantite | LiTa3O8 |
| 4.DB.40 | Lithiowodginite | LiTa3O8 |
| 4.DB.40 | Titanowodginite | Mn2+TiTa2O8 |
| 4.DB.40 | Wodginite | Mn2+Sn4+Ta2O8 |
| 4.DB.40 | Ferrotitanowodginite | Fe2+TiTa2O8 |
| 4.DB.40 | Tantalowodginite | (Mn2+0.5◻0.5)TaTa2O8 |
| 4.DB.40 | Wolframowodginite | Mn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8 |
| 4.DB.45 | Tivanite | V3+TiO3(OH) |
| 4.DB.50 | Carmichaelite | (Ti,Cr,Fe)[O2-x(OH)x] |
| 4.DB.55 | Alumotantite | AlTaO4 |
| 4.DB.60 | Biehlite | ((Sb,As)O)2[MoO4] |
Fluorescence of Ishikawaite
Not fluorescent in UV.
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Ishikawaite
mindat.org URL:
https://www.mindat.org/min-2050.html
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References for Ishikawaite
Localities for Ishikawaite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Afghanistan | |
| Hanson et al. (1999) | |
Australia | |
| Brugger et al. (2011) |
Canada | |
| DIXON et al. (2014) |
China | |
| Zhang Peishan et al. (1996) |
| Rubo Zhang and Fengming Han (1983) |
| www.smartminerals.com (2004) | |
Czech Republic | |
| Škoda |
Egypt | |
| Yehia H. Dawood (2011) +1 other reference |
| Abdel Gawad et al. (2022) |
| Kamar et al. (2022, August) | |
France | |
| MONCHOUX P. et al. (2006) |
Japan (TL) | |
| Min Mag 63 (1999) |
| Alfredo Petrov collection (ex- Bill Pinch collection) |
| Alfredo Petrov collection | |
Poland | |
| PIECZKA et al. 2010: Nb-Ta minerals in ... |
| Pieczka et al. (2012) +1 other reference | |
Russia | |
| Yu.S. Kobyashev data |
| Pavel.M. Kartashov (n.d.) | |
| www.mindat.org (n.d.) | |
| webmineral.ru (2021) |
USA | |
| Simmons W B et al. (2006) |
| Hanson et al. (2003) |
| Hanson +1 other reference |
| Canadian Mineralogist Vol. 36 |
| King et al. (1994) +1 other reference | |
| Thompson et al. (1998) | |
| King et al. (1994) +1 other reference | |
| King et al. (1994) +1 other reference | |
| King et al. (1994) +1 other reference | |
| King et al. (1994) | |
| Rocks & Min. 80:246 (2005) |
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Yedlin Locality, Topsham, Sagadahoc County, Maine, USA