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Mandarinoite

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De Lamar Mine (Wahl; Sommercamp; Voschay), De Lamar District, Owyhee Co., Idaho, USA
© Brent Thorne

Show Mandarinoite Photos (5)
Formula:
Fe
 
2
Se
 
3
O
 
9
·4H
 
2
O
System:MonoclinicColour:Pale yellow green
Lustre:Vitreous, GreasyHardness:2½
Name:For Dr. Joseph Anthony Mandarino (1929-2007), American-Canadian mineralogist.


A secondary mineral found in the oxidized zones of selenium- and iron-bearing deposits.

Classification of Mandarinoite

IMA status:Approved
Strunz 8th edition ID:4/K.08-10
Nickel-Strunz 10th (pending) edition ID:4.JH.15

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
Dana 8th edition ID:34.3.4.1

34 : SELENITES, TELLURITES AND SULFITES
3 : A2(XO3)3·xH2O
Hey's CIM Ref.:28.1.11

28 : Selenites, Selenates, Tellurites, and Tellurates
1 : Selenites
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Type Occurrence of Mandarinoite

Type Locality:Virgen de Surumi mine, Pakajake Canyon (Pacajake Canyon), Chayanta Province, Potosí Department, Bolivia
Place of Conservation of Type Material:Royal Ontario Museum, Ottawa, Canada 35273
Year of Discovery:1978
Geological Setting of type material:Formed by the oxidation of penroseite and pyrite.

Physical Properties of Mandarinoite

Lustre:Vitreous, Greasy
Diaphaneity (Transparency):Transparent
Colour:Pale yellow green
Streak:Very pale green
Hardness (Mohs):2½
Parting:Parting on {100}
Density (measured):2.93(3) g/cm3
Density (calculated):3.04 g/cm3

Crystallography of Mandarinoite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b (P1 1 21/b) [P21/c] {P1 21/c 1} {P21/a}
Cell Parameters:a = 16.81(4) Å, b = 7.88(2) Å, c = 10.019(2) Å
β = 98.26(2)°
Ratio:a:b:c = 2.133 : 1 : 1.271
Unit Cell Volume:V 1,313.38 ų (Calculated from Unit Cell)
Z:4
Morphology:Crystals are swordlike, in rosettes and subparallel aggregates.
Twinning:Common as contact twins on {100}

Optical Data of Mandarinoite

Type:Biaxial (-)
RI values: nα = 1.715 nβ = 1.797 - 1.800 nγ = 1.860 - 1.870
2V:Measured: 80° to 85°, Calculated: 80°
Maximum Birefringence:δ = 0.145 - 0.155

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:strong
Pleochroism:Visible
Comments:X= colorless
Y=Z= pale green

Chemical Properties of Mandarinoite

Formula:
Fe
 
2
Se
 
3
O
 
9
·4H
 
2
O
Essential elements:Fe, H, O, Se
All elements listed in formula:Fe, H, O, Se
Empirical Formula:
Fe
3+
2
Se
 
3
O
 
9
·4H
 
2
O

Relationship of Mandarinoite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JH.05Chalcomenite
Cu[SeO
 
3
] · 2H
 
2
O
4.JH.10Ahlfeldite
(Ni,Co)[SeO
 
3
] · 2H
 
2
O
4.JH.10Clinochalcomenite
Cu[SeO
 
3
] · 2H
 
2
O
4.JH.10Cobaltomenite
Co[SeO
 
3
] · 2H
 
2
O
4.JH.20Orlandiite
Pb
 
10
(SeO
 
4
)O
 
7
Cl
 
4
·H
 
2
O
4.JH.20UM1999-29-SeO:ClCuHPb
Pb
 
4
CuCl
 
3
(SeO
 
3
)
 
3
(OH)
4.JH.25Larisaite
Na(H
 
3
O)(UO
 
2
)
 
3
(SeO
 
3
)O
 
2
·4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
28.1.1Chalcomenite
Cu[SeO
 
3
] · 2H
 
2
O
28.1.2Clinochalcomenite
Cu[SeO
 
3
] · 2H
 
2
O
28.1.3Francisite
Cu
 
3
Bi(SeO
 
3
)
 
2
O
 
2
Cl
28.1.4Sophiite
Zn
 
2
[Cl
 
2
|SeO
 
3
]
28.1.5Molybdomenite
PbSeO
 
3
28.1.6Haynesite
(UO
 
2
)
 
3
(OH)
 
2
(SeO
 
3
)
 
2
·5H
 
2
O
28.1.7Derriksite
Cu
 
4
UO
 
2
(SeO
 
3
)
 
2
(OH)
 
6
·H
 
2
O
28.1.8Marthozite
Cu(UO
 
2
)
 
3
(SeO
 
3
)
 
3
(OH)
 
2
·7H
 
2
O
28.1.9Guilleminite
Ba(UO
 
2
)
 
3
(SeO
 
3
)
 
2
(OH)
 
4
·3H
 
2
O
28.1.10Demesmaekerite
Pb
 
2
Cu
 
5
(UO
 
2
)
 
2
(SeO
 
3
)
 
6
(OH)
 
6
·2H
 
2
O
28.1.12Cobaltomenite
Co[SeO
 
3
] · 2H
 
2
O
28.1.13Ahlfeldite
(Ni,Co)[SeO
 
3
] · 2H
 
2
O

Other Names for Mandarinoite

Synonyms:
IMA1977-049
Other Languages:
German:Mandarinoit
Russian:Мандариноит
Spanish:Mandarinoita

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 Mandarinoite

Reference List:American Mineralogist (1980): 65: 206.

Canadian Mineralogist (1978): 16: 605-609.

Canadian Mineralogist (1984): 22: 475-480.

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    Localities for Mandarinoite

    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.
    Australia
     
    • New South Wales
      • Robinson Co.
        • Cobar
          • Cobar
    		http://leme.anu.edu.au/Pubs/Advancesinregolith/Leverett_et_al.pdf
          • Kaloogleguy
    		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.
    Bolivia
     
    • Potosí Department
      • Chayanta Province
        • Pakajake Canyon (Pacajake Canyon)
    		[Can.Min.(1978) 16, 605-609; MinRec 32:476]
      • Quijarro Province
    		[MinRec 21:133]
    China
     
    • Hubei Province
      • Enshi (E'xi) Autonomous Prefecture
        • Enshi Co.
          • Shuanghe
    		Zhu Jian-Ming, and Zheng Bao-Shan (2002): Journal of the Graduate School of the Chinese Academy of Sciences 19(2), 219-221.
    Cyprus
     
    • Nicosia District
      • Skouriotissa
    		Rocks & Min.: 64:48.
    Honduras
     
    • Francisco Morazán Department
      • Distrito Central
        • Tegucigalpa
          • Ojojona
    		Rocks & Min.:64:48.
    Italy
     
    • 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.
    USA
     
    • Idaho
      • Owyhee Co.
        • De Lamar District
    		Rocks & Min.:64:48.
    • Nevada
      • Eureka Co.
        • Lynn District
          • Elko
    		MinRecord 26:467
        • Maggie Creek District
    		MinRec 26(5):449-469.
      • Washoe Co.
        • San Emidio District
    		NBMG Spec. Pub. 31 Minerals of Nevada
    Mineral and/or Locality
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