Iowaite (original) (raw)

A valid IMA mineral species

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About IowaiteHide

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Formula:

Mg6Fe3+2(OH)16Cl2 · 4H2O

Name:

For the state of the type locality.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2038:7

eed77052-7ca7-4f15-9638-4e1d295fe87b

IMA Classification of IowaiteHide

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Type description reference:

Classification of IowaiteHide

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4.FL.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
L : Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra

6.4.5.1

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
4 : Miscellaneous

8.11.8

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
11 : Halides of Fe and Ni

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Symbol Source Reference
Iow IMA–CNMNC Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
Iow Warr (2020) Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30

Physical Properties of IowaiteHide

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Cleavage:

Perfect
Perfect basal cleavage

Density:

2.11(2) g/cm3 (Measured)

Optical Data of IowaiteHide

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RI values:

_n_ω = 1.543 - 1.561 _n_ε = 1.533 - 1.543

δ = 0.010 - 0.018

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of IowaiteHide

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Mindat Formula:

Mg6Fe3+2(OH)16Cl2 · 4H2O

Crystallography of IowaiteHide

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Class (H-M):

3_m_ _(_32/m ) - Hexagonal Scalenohedral

Cell Parameters:

a = 3.1077(9) Å, c = 23.885(13) Å

Comment:

updated cell parameters from Zhitova et al. (2023); formerly here: a=3.119(5), c=24.25(2) (also from a powder diffraction data)

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

d-spacing Intensity
8.109 Å (100)
4.047 Å (40)
2.363 Å (27)
2.019 Å (23)
2.639 Å (17)
1.530 Å (13)
1.560 Å (8)

Comments:

Sioux Co., Iowa, USA. Data from the type description. The type specimen was remeasured about 27 years later (Braithwaite 1994) and a shift in the data was measured, likely due to dehydration.

Geological EnvironmentHide

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Type Occurrence of IowaiteHide

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General Appearance of Type Material:

Platy crystals 2-3mm in size

Place of Conservation of Type Material:

National Museum of Natural History, Washington, D.C., USA, 121706.

Geological Setting of Type Material:

Altered serpentinite in precambrian basement

Reference:

Kohls, D.W., Rodda,, J.L. (1967) Iowaite, a new hydrous magnesium hydroxide-ferric oxychloride from the Precambrian of Iowa. American Mineralogist: 52: 1261-1271.

Synonyms of IowaiteHide

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Other Language Names for IowaiteHide

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Varieties of IowaiteHide

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Relationship of Iowaite to other SpeciesHide

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Other Members of this group:

Desautelsite Mg6Mn3+2(OH)16[CO3] · 4H2O Trig. 3_m_ _(_32/m )
Droninoite Ni6Fe3+2(OH)16Cl2 · 4H2O Trig. 3_m_ _(_32/m ) : R_3_m
Hydrotalcite Mg6Al2(CO3)(OH)16 · 4H2O Trig. 3_m_ _(_32/m ) : R_3_m
Hydrotalcite-3R Mg6Al2(CO3)(OH)16 · 4H2O Trig. 3_m_ _(_32/m ) : R_3_m
Kaznakhtite Ni6Co3+2(CO3)(OH)16 · 4H2O Trig. 3 : _R_3
Meixnerite Mg6Al2(OH)16(OH)2 · 4H2O Trig. 3_m_ _(_32/m ) : R_3_m
Pyroaurite Mg6Fe3+2(OH)16[CO3] · 4H2O Trig. 3_m_ _(_32/m ) : R_3_m
Reevesite Ni6Fe3+2(OH)16(CO3) · 4H2O Trig. 3_m_ _(_32/m ) : R_3_m
Stichtite Mg6Cr3+2(OH)16[CO3] · 4H2O Trig. 3_m_ _(_32/m ) : R_3_m
Takovite Ni6Al2(OH)16[CO3] · 4H2O Trig. 3_m_ _(_32/m ) : R_3_m
UM2002-02-COH:FeNi (Fe2+,Ni)6Fe3+2(CO3)(OH)16 · 4H2O
Woodallite Mg6Cr2(OH)16Cl2 · 4H2O Trig. 3_m_ _(_32/m ) : R_3_m

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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4.FL. Trébeurdenite Fe2+2Fe3+4O2(OH)10CO3 · 3H2O Trig. 3_m_ _(_32/m ) : R_3_m
4.FL. Mariakrite [Ca4Al2(OH)12(H2O)4][Fe2S4] Tric. 1 : _P_1
4.FL.05 Muskoxite Mg7Fe4O13 · 10H2O Trig. 3_m_ _(_32/m )
4.FL.05 Jamborite Ni2+1-xCo3+x(OH)2-x(SO4)x · nH2O Trig. 3_m_ _(_32/m ) : R_3_m
4.FL.05 Mössbauerite Fe3+6O4(OH)8[CO3] · 3H2O Trig. 3
4.FL.05 Meixnerite Mg6Al2(OH)16(OH)2 · 4H2O Trig. 3_m_ _(_32/m ) : R_3_m
4.FL.05 Woodallite Mg6Cr2(OH)16Cl2 · 4H2O Trig. 3_m_ _(_32/m ) : R_3_m
4.FL.05 Fougèrite Fe2+4Fe3+2(OH)12[CO3] · 3H2O Trig. 3_m_ _(_32/m ) : R_3_m
4.FL.05 Dritsite Li2Al4(OH)12Cl2 · 3H2O Hex. 6/m m m _(_6/_m_2/_m_2/m ) : _P_63/m c m
4.FL.05 Rotemite Ca4Cr2(OH)12Cl2 · 4H2O Trig. 3_m_ _(_32/m ) : R_3_c
4.FL.10 Hydrocalumite Ca4Al2(OH)12(Cl,CO3,OH)2 · 4H2O Mon. 2 : _P_21
4.FL.15 Kuzelite Ca4Al2(OH)12[SO4] · 6H2O Trig.
4.FL.20 Jianshuiite (Mg,Mn,Ca)Mn3O7 · 3H2O Trig. 3 : _R_3
4.FL.20 Ernienickelite NiMn3O7 · 3H2O Trig. 3 : _R_3
4.FL.20 Aurorite Mn2+Mn4+3O7 · 3H2O Trig. 3 : _R_3
4.FL.20 Chalcophanite ZnMn4+3O7 · 3H2O Trig. 3 : _R_3
4.FL.25 Woodruffite Zn2+x/2(Mn4+1-xMn3+x)O2 · yH2O Mon. 2/m : _B_2/m
4.FL.30 Asbolane (Ni,Co)2-xMn4+(O,OH)4 · nH2O Hex.
4.FL.30 va Lampadite Cu, Mn, O, H
4.FL.35 Buserite Na4Mn14O27 · 21H2O
4.FL.40 Takanelite (Mn,Ca)Mn4O9 · H2O Hex.
4.FL.40 Ranciéite (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O Trig. 3 : _P_3
4.FL.45 Birnessite (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O Mon. 2/m : _B_2/m
4.FL.55 Cianciulliite Mn(Mg,Mn)2Zn2(OH)10 · 2-4H2O Mon. 2/m : _B_2/m
4.FL.60 Jensenite Cu3[TeO6] · 2H2O Mon. 2/m : _P_21/m
4.FL.65 Leisingite Cu2MgTe6+O6 · 6H2O Trig. 3 : _P_3
4.FL.70 Akdalaite Al10O14(OH)2 Hex.
4.FL.75 Cafetite CaTi2O5 · H2O Mon. 2/m : _P_21/b
4.FL.80 Mourite UMo5O12(OH)10 Mon.
4.FL.85 Deloryite Cu4(UO2)(MoO4)2(OH)6 Mon. 2/m : _B_2/m
4.FL.90 Lagalyite Ca2xMn1-xO2 · 1.5-2H2O Mon.
4.FL.95 Tunnerite (of Cornu)
4.FL.100 Carbocalumite Ca4Al2(OH)12(CO3) · 6H2O Trig. 3_m_ _(_32/m ) : R_3_c
4.FL.100 Mampsisite Ca4Al2(CO3)(OH)12 · 5H2O Tric.

Other InformationHide

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Thermal Behaviour:

In DTA measurements, a large endothermic reaction occurs between 315°C and 350°C, representing a collapse of the iowaite structure. The material changes in color from light tan to dark brown, water is evolved, and periclase is formed.

Notes:

Insoluble in water and readily soluble in mineral acids.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

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References for IowaiteHide

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Reference List:

Mills, S. J., Christy, A. G., Génin, J.-M. R., Kameda, T., Colombo, F. (2012) Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76 (5) 1289-1336 doi:10.1180/minmag.2012.076.5.10

Zhitova, Elena S., Chukanov, Nikita V., Pekov, Igor V., Zolotarev, Andrey A., Shilovskikh, Vladimir V., Bocharov, Vladimir N. (2023) Crystal chemistry of iowaite, Mg6FeIII2(OH)16Cl2 × 4H2O, a natural layered double hydroxide. Applied Clay Science, 243. 107070 doi:10.1016/j.clay.2023.107070

Localities for IowaiteHide

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This 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.

Locality ListHide

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- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Atlantic Ocean
ⓘ Iberia Abyssal Plain Plas (1997)
Walvis Ridge ⓘ ODP Site 1272 Moll et al. (2007)
Australia
Western Australia Kalgoorlie-Boulder Shire ⓘ Black Swan Mine Barnes et al. (2009)
Wiluna Shire Lake Way Station ⓘ Honeymoon Well complex Disseminated and Massive Nickel ... +2 other references
ⓘ West Jordan deposit Grguric et al. (2013)
ⓘ Mount Keith Wilson et al. (2014)
ⓘ Mount Keith Open Pit [AmMin 87:182]
Canada
Manitoba Thompson Nickel Belt ⓘ South Manasan ultramafic intrusion Franchuk et al. (2016)
Ontario Kenora District Ring of Fire BMA527861 Area ⓘ Black Label deposit Jordan E. Laarman (2014)
ⓘ Black Thor chromite deposit Jordan E. Laarman (2014)
Québec Estrie Les Sources RCM Val-des-Sources ⓘ Jeffrey Mine Horváth et al. (2013)
China
Inner Mongolia Xilingol League (Xilinguole Prefecture) West Ujimqin Banner (Xiwuzhumuqin Co.) ⓘ Hegenshan Ophiolite Zhu et al. (2015)
France
New Caledonia Southern Province Le Mont-Dore ⓘ Prony Bay Monnin et al. (2014)
Oman
Al Batinah North Governorate ⓘ Mamy Nova Chavagnac et al. (2013)
Pacific Ocean
East Pacific Rise ⓘ Hess Deep Plas (1997)
Mariana forearc ⓘ DSDP 778 Heling et al. (1992)
ⓘ Pacman Seamount Wheat et al. (2008)
Poland
Silesian Voivodeship Wodzisław County Radlin ⓘ Marcel mine heap Łukasz Kruszewski (2012)
Zawiercie County Gmina Łazy Rokitno Szlacheckie ⓘ Zawiercie skarn Koszowska E.
Russia
Altai Republic Ust-Koksinsky District Terekta Ridge ⓘ Kyzyl-Uyuk locality Zhitova et al. (2020)
ⓘ Kaznakhtinskii ultrabasic massif Igor V. Pekov data
Irkutsk Oblast Nizhneilimsky District Zheleznogorsk-Ilimsky ⓘ Korshunovskoye iron deposit Mazurov et al. (2007) +1 other reference
Krasnoyarsk Krai Taymyrskiy Autonomous Okrug Taimyr Peninsula Norilsk-Talnakh Mining Region Talnakh Cu-Ni Deposit ⓘ Komsomol'skii Mine Mineralogical Society of America - ... +1 other reference
Sakha Mirninsky District Daldyn ⓘ Udachnaya open-pit mine (Udachnaya-Vostochnaya pipe; Udachnaya pipe) Pavel.M. Kartashov (n.d.) +5 other references
South Africa
Limpopo Mopani District Municipality Ba-Phalaborwa Local Municipality Phalaborwa ⓘ Palabora Mine Braithwaite et al. (1994) +2 other references
Spain
Andalusia Almería ⓘ Cerro del Almirez massif Evans et al. (2012)
USA (TL)
Iowa Sioux County ⓘ Matlock drill core (TL) American Mineralogist: 52: 1261-1271.
New Jersey Sussex County Ogdensburg Sterling Hill ⓘ Sterling Mine Modris Baum collection - Joy Desor ...
Uzbekistan
Tashkent Piskent District ⓘ Olmaliq Mineralogical Society of America - ...