Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
Joseph Anthony Mandarino
Fe23+(Se4+O3)3 · 6H2O
Pale yellow green
Vitreous, Greasy
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 Mandarinoite


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 Mandarinoite

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

Optical Data of Mandarinoite

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 Mandarinoite

IMA Formula:
Fe23+(Se4+O3)3 · 6H2O
Elements listed in formula:

Crystallography of Mandarinoite

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 Volume:
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 Mandarinoite

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.
Empirical Formula:
Fe23+Se3O9 · 4H2O

Relationship of Mandarinoite to other Species

4.JH.05ChalcomeniteCuSe4+O3 · 2H2O
4.JH.10AhlfelditeNiSeO3 · 2H2O
4.JH.10ClinochalcomeniteCuSeO3 · 2H2O
4.JH.10CobaltomeniteCoSe4+O3 · 2H2O
4.JH.20OrlandiitePb3Cl4(Se4+O3) · H2O
4.JH.25LarisaiteNa(H3O)(UO2)3(Se4+O3)2O2 · 4H2O
28.1.1ChalcomeniteCuSe4+O3 · 2H2O
28.1.2ClinochalcomeniteCuSeO3 · 2H2O
28.1.6Haynesite(UO2)3(Se4+O3)2(OH)2 · 5H2O
28.1.8MarthoziteCu2+(UO2)3(Se4+O3)2O2 · 8H2O
28.1.9GuilleminiteBa(UO2)3(Se4+O3)2O2 · 3H2O
28.1.10DemesmaekeritePb2Cu5(UO2)2(Se4+O3)6(OH)6 · 2H2O
28.1.12CobaltomeniteCoSe4+O3 · 2H2O
28.1.13AhlfelditeNiSeO3 · 2H2O

Other Names for Mandarinoite

Name in Other Languages:
Simplified Chinese:水硒铁石

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.

References for Mandarinoite

Reference List:
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.

Internet Links for Mandarinoite URL:
Please feel free to link to this page.

Localities for Mandarinoite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
  • New South Wales
    • Robinson Co.
      • Cobar
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 Department
    • Antonio Quijarro Province
[MinRec 21:133]
    • 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 16, 605-609. HAWTHORNE, F.C. (1984): The crystal structure of mandarinoite,Fe3+2Se3O96H2O. Canadian Mineralogist 22, 475-480.
  • Hubei Province
    • 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 (Lefkoşa District; Lefkosia District)
    • Skouriotissa
Rocks & Min.: 64:48.
  • Francisco Morazán Department
    • Distrito Central
      • Tegucigalpa
        • Ojojona
Rocks & Min.:64:48.
  • Sardinia
    • Cagliari Province
      • 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.
  • Colorado
    • San Miguel Co.
      • Uravan District
Collected by and in the collection of Brent Thorne.
  • Idaho
    • Owyhee Co.
      • De Lamar District
Rocks & Min.:64:48.; Can Mineral 1981 19: 409-410
  • Nevada
    • Eureka Co.
      • Carlin Trend
        • Maggie Creek Subdistrict
MinRec 26(5):449-469.
      • Lynn District
        • Elko
Mineralogical Record 26:467
    • Washoe Co.
      • San Emidio District
NBMG Spec. Pub. 31 Minerals of Nevada
  • Utah
    • Grand Co.
      • Polar Mesa District (Polar Mesa)
Collected by and in the collection of Brent Thorne.
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2017, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: June 26, 2017 20:02:29 Page generated: June 19, 2017 03:25:06
Go to top of page