Mandarinoite Mineral Data

General Mandarinoite Information

Chemical Formula:

Fe+++2Se3O9•6(H2O)

Composition:

Molecular Weight = 600.66 gm

Iron 18.60 % Fe 26.59 % Fe₂O₃

Hydrogen 2.01 % H 18.00 % H₂O

Selenium 39.44 % Se 51.42 % Se₂O₃

Oxygen 39.95 % O

______ ______

100.00 % 96.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₂Se₃O₉•6(H₂O)

Environment:

Found on a penroseite museum specimen. Probable oxidation product of penroseite and siderite or pyrite.

IMA Status:

Approved IMA 1978

Locality:

Pacajake mine, Potosi, Bolivia. Link to MinDat.org Location Data.

Name Origin:

Named for Joseph A. Mandarino of the Royal Ontario Museum in recognition of his work on selenites.

Name Pronunciation:

Mandarinoite + Pronunciation

Synonym:

ICSD 201805

IMA1977-049

PDF 29-719

Mandarinoite Image

Images:

Mandarinoite

Comments: Specimen of solid manandonite with crystals to 2 mm.
Location: Manandona River, Sahatany Valley, Madagascar. Scale: 2.2 x 1.3 cm.
© John Veevaert

Mandarinoite Crystallography

Axial Ratios:

a:b:c =2.1348:1:1.2671

Cell Dimensions:

a = 16.78, b = 7.86, c = 9.96, Z = 4; beta = 98.3° V = 1,299.87 Den(Calc)= 3.07

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.1(1), 2.977(0.7), 3.55(0.5),

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Forms: ( 1 1 0) ( 0 1 1) ( 1 0 0) ( 0 0 1)

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Crystal Structure:

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Hawthorne F C , The Canadian Mineralogist , 22 (1984) p.475-480, The crystal structure of mandarinoite, Fe2Se3O9.6H2O

Physical Properties of Mandarinoite

Cleavage:

None

Color:

Greenish white, Light green.

Density:

2.93

Diaphaneity:

Translucent

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Habit:

Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Greasy

Streak:

light green

Optical Properties of Mandarinoite

Gladstone-Dale:

CI meas= -0.872 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.787 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.259,KPDmeas= 0.2713,KC= 0.1449
Ncalc = 1.42 - 1.44

Optical Data:

Biaxial (-), a=1.715, b=1.8, g=1.87, bire=0.1550, 2V(Calc)=80, 2V(Meas)=85.

Calculated Properties of Mandarinoite

Electron Density:

Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Mandarinoite =3.07 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Mandarinoite= 34.90 barns/electron
U=PE_Mandarinoite x rElectron Density= 102.04 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mandarinoite is Not Radioactive

Mandarinoite Classification

Dana Class:

34.03.04.01 (34)Selenites - Tellurites - Sulfites

(34.03)Dana Type

(34.03.04)Dana Group

34.03.04.01 Mandarinoite Fe2Se3O9•6(H2O) P 2₁/c 2/m

Strunz Class:

04.JH.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JH -Selenites without additional anions, with H2O

04.JH.15 Mandarinoite Fe2Se3O9•6(H2O) P 2₁/c 2/m

Other Mandarinoite Information

References:

NAME( MinRec, v 34, p 350) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Mandarinoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Mandarinoite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Mandarinoite Specimen Label here :

Mandarinoite

Fe+++2Se3O9•6(H2O)
Dana No: 34.03.04.01 Strunz No: 04.JH.15
Locality:

Notes: