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About MandarinoiteHide

Joseph Anthony Mandarino
Fe3+2(Se4+O3)3 · (6-x)H2O (x = 0.0-1.0)
Formula according to Holzheid et al. (2018).
Pale yellow green
Vitreous, Greasy
Specific Gravity:
Crystal System:
Named in honor of Joseph Anthony Mandarino (1929-2007), American-Canadian mineralogist, former Curator of Mineralogy, Royal Ontario Museum, Toronto, Ontario, for his many outstanding contributions to mineralogy, “in particular the insights he has provided into the relationships of the Gladstone-Dale rule.” He also contributed greatly to the formalization of mineral systematics as Chairman of IMA CNMMN.
A secondary mineral found in the oxidized zones of selenium- and iron-bearing deposits.

Classification of MandarinoiteHide


4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
H : Selenites without additional anions, with H2O

3 : A2(XO3)3·xH2O

28 : Selenites, Selenates, Tellurites, and Tellurates
1 : Selenites

Physical Properties of MandarinoiteHide

Vitreous, Greasy
Pale yellow green
Very pale green
2½ on Mohs scale
Parting on {100}
2.93(3) g/cm3 (Measured)    3.04 g/cm3 (Calculated)

Optical Data of MandarinoiteHide

Biaxial (-)
RI values:
nα = 1.715 nβ = 1.797 - 1.800 nγ = 1.860 - 1.870
Measured: 80° to 85°, Calculated: 80°
Max Birefringence:
δ = 0.145 - 0.155
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
X= colorless
Y=Z= pale green

Chemical Properties of MandarinoiteHide

Fe3+2(Se4+O3)3 · (6-x)H2O (x = 0.0-1.0)

Formula according to Holzheid et al. (2018).
IMA Formula:
Fe3+2(Se4+O3)3 · 6H2O

Crystallography of MandarinoiteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 16.81(4) Å, b = 7.88(2) Å, c = 10.019(2) Å
β = 98.26(2)°
a:b:c = 2.133 : 1 : 1.271
Unit Cell V:
1,313.38 ų (Calculated from Unit Cell)
Crystals are swordlike, in rosettes and subparallel aggregates.
Common as contact twins on {100}

Type Occurrence of MandarinoiteHide

Place of Conservation of Type Material:
Royal Ontario Museum, Ottawa, Canada 35273
Geological Setting of Type Material:
Formed by the oxidation of penroseite and pyrite.

Synonyms of MandarinoiteHide

Other Language Names for MandarinoiteHide

Simplified Chinese:水硒铁石

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Mandarinoite associated with ChalcomeniteCuSeO3 · 2H2O

Related Minerals - Nickel-Strunz GroupingHide

4.JH.05ChalcomeniteCuSeO3 · 2H2OOrth. 2 2 2 : P21 21 21
4.JH.10AhlfelditeNi(SeO3) · 2H2OMon. 2/m
4.JH.10ClinochalcomeniteCuSeO3 · 2H2OMon.
4.JH.10CobaltomeniteCoSeO3 · 2H2OMon.
4.JH.20OrlandiitePb3(SeO3)(Cl,OH)4 · H2O Tric.
4.JH.25LarisaiteNa(H3O)(UO2)3(SeO3)O2 · 4H2OMon. m : Pm

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

28.1.1ChalcomeniteCuSeO3 · 2H2OOrth. 2 2 2 : P21 21 21
28.1.2ClinochalcomeniteCuSeO3 · 2H2OMon.
28.1.3FrancisiteCu3Bi(SeO3)2O2ClOrth. mmm (2/m 2/m 2/m) : Pmmn
28.1.6Haynesite(UO2)3(OH)2(SeO3)2 · 5H2OOrth.
28.1.8MarthoziteCu2+(UO2)3(SeO3)2O2 · 8H2OOrth.
28.1.9GuilleminiteBa(UO2)3(SeO3)2O2 · 3H2OOrth. mm2 : Pmn21
28.1.10DemesmaekeritePb2Cu5(UO2)2(SeO3)6(OH)6 · 2H2OTric.
28.1.12CobaltomeniteCoSeO3 · 2H2OMon.
28.1.13AhlfelditeNi(SeO3) · 2H2OMon. 2/m

Other InformationHide

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

References for MandarinoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
DUNN, P.J., PEACOR, D.R. & STURMAN, B.D. (1978): Mandarinoite, a new ferric-iron selenite from Bolivia. Canadian Mineralogist 16, 605-609.
HAWTHORNE, F.C. (1984): The crystal structure of mandarinoite,Fe3+2Se3O9.6H2O. Canadian Mineralogist 22, 475-480.
Maxim I. Lelet, Marina V. Charykova, Astrid Holzheid, Brendan Ledwig, Vladimir G. Krivovichev and Evgeny V. Suleimanov (2018): A calorimetric and thermodynamic investigation of the synthetic analogue of mandarinoite, Fe2(SeO3)3·5H2O. Geosciences 8, 391.
Astrid Holzheid, Marina V. Charykova, Vladimir G. Krivovichev, Brendan Ledwig,
Elena L. Fokina, Ksenia L. Poroshina, Natalia V. Platonova, Vladislav V. Gurzhiy (2018): Thermal behavior of ferric selenite hydrates (Fe2(SeO3)3·3H2O, Fe2(SeO3)3·5H2O) and the water content in the natural ferric selenite mandarinoite. Chemie der Erde, 78, 228-240.

Internet Links for MandarinoiteHide

Localities for MandarinoiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • La Rioja Province
    • General Lamadrid department
      • Villa Castelli
Grundmann, G., & Förster, H. J. (2018). The Sierra de Cacheuta Vein-Type Se Mineralization, Mendoza Province, Argentina. Minerals, 8(4), 127.
  • New South Wales
    • Robinson Co.
      • Cobar
Leverett, P., McKinnon, A.R., Williams, P.A. (2003) Mineralogy of the oxidised zone at the New Cobar orebody. Advances in Regolith. CRC LEME, Bentley, 267-270.
Leverett, P., McKinnon, A.R., Sharpe, J.L. and Williams, P.A. (2005) Secondary minerals from the central Cobar mines. Australian Journal of Mineralogy, 11, 75-82.
  • Potosí
    • Antonio Quijarro Province
[MinRec 21:133]; Grundmann, G. and Förster H.-J. (2017) Origin of the El Dragón Selenium Mineralization, Quijarro Province, Potosí, Bolivia. Minerals, 7(5), 68; doi:10.3390/min7050068
    • Chayanta Province
      • Pakajake Canyon (Pacajake Canyon)
Dunn, P.J., Peacor, D.R. & Sturman, B.D. (1978) Mandarinoite, a new ferric-iron selenite from Bolivia. Canadian Mineralogist Vol.16, pp.605-609. Hawthorne, F.C. (1984) The crystal structure of mandarinoite, Fe³⁺₂Se₃O₉.6H₂O. Canadian Mineralogist Vol.22, pp. 475-480.
  • Coquimbo
    • Elqui Province
      • El Indio deposit
Back, M.E., Grice, J.D., Gault, R.A., Cooper, M.A., Walford, P.C., Mandarino, J.A. (2017) Telluromandarinoite, A New Tellurite Mineral From the El Indio-Tambo, Mining Property, Andes Mountains, Chile. Canadian Mineralogist, 55, 21-28.
  • Hubei
    • Enshi Autonomous Prefecture (E'xi Autonomous Prefecture)
      • Enshi Co.
Zhu Jian-Ming, and Zheng Bao-Shan (2002): Journal of the Graduate School of the Chinese Academy of Sciences 19(2), 219-221; Handong Qian, Zhenghua Zhao, Xiang Zheng, Chengyi Lin, Jiahu Zeng, Xuemei Wu, and Wu Chen (2006): Acta Geologica Sinica 80(11), 1706-1710; Zhu, Jian-ming; Johnson, Thomas M.; Finkelman, Robert B.; Zheng, Bao-shan; Sykorova, Ivana; Pesek, Jiri (2012): The occurrence and origin of selenium minerals in Se-rich stone coals, spoils and their adjacent soils in Yutangba, China. Chemical Geology 330-331, 27-38.
  • Nicosia District
    • Skouriotissa
Rocks & Min.: 64:48.
  • Francisco Morazán Department
    • Distrito Central
      • Tegucigalpa
        • Ojojona
Rocks & Min.:64:48.
  • Sardinia
    • South Sardinia Province
      • Sarrabus-Gerrei
        • Gerrei
          • Villaputzu
Campostrini, I. & Gramaccioli, C. M. (2001): Selenium-rich secondary minerals from the Baccu Locci mine (Sardinia, Italy). Neues Jahrbuch fuer Mineralogie, Abhandlungen 177, 37-59.; Campostrini, I., Gramaccioli, C. M. and Demartin, F. (1999): Orlandiite, Pb3Cl4(SeO3)3•H2O, a new mineral species, and an associated lead-copper selenite chloride from the Baccu Locci mine, Sardinia, Italy. Can. Mineral. 37, 1493-1498
  • Colorado
    • San Miguel Co.
      • Uravan Mining District
Collected by and in the collection of Brent Thorne.
  • Idaho
    • Owyhee Co.
      • De Lamar Mining District
Rocks & Min.:64:48.; Can Mineral 1981 19: 409-410
  • Nevada
    • Eureka Co.
      • Carlin Trend
        • Maggie Creek Mining Subdistrict
MinRec 26(5):449-469.
      • Lynn Mining District
        • Elko
Mineralogical Record 26:467
    • Washoe Co.
      • San Emidio Mining District
NBMG Spec. Pub. 31 Minerals of Nevada
  • Utah
    • Grand Co.
      • Polar Mesa Mining District
Collected by and in the collection of Brent Thorne.
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