Mineralogy Database

Mandarinoite Mineral Data

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General Mandarinoite Information

Help on Chemical  Formula: Chemical Formula: Fe+++2Se3O9•6(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe3+2Se3O9•6(H2O)
Help on Environment: Environment: Found on a penroseite museum specimen. Probable oxidation product of penroseite and siderite or pyrite.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Pacajake mine, Potosi, Bolivia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Joseph A. Mandarino of the Royal Ontario Museum in recognition of his work on selenites.
Help on Name Pronunciation: Name Pronunciation: Mandarinoite + Pronunciation Say MANDARINOITE
Help on Synonym: Synonym: ICSD 201805
  PDF 29-719

Mandarinoite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =2.1348:1:1.2671
Help on Cell Dimensions: Cell Dimensions: a = 16.78, b = 7.86, c = 9.96, Z = 4; beta = 98.3° V = 1,299.87 Den(Calc)= 3.07
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.1(1), 2.977(0.7), 3.55(0.5),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

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

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Mandarinoite

Help on Cleavage: Cleavage: None
Help on Color: Color: Greenish white, Light green.
Help on Density: Density: 2.93
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Reniform - "Kidney like" in shape (e.g.. hematite).
Help on Habit: Habit: Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: light green

Optical Properties of Mandarinoite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Mandarinoite =3.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEMandarinoite = 34.90 barns/electron
U=PEMandarinoite x rElectron Density= 102.04 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mandarinoite is Not Radioactive

Mandarinoite Classification

Help on  Dana Class: Dana Class: (34)Selenites - Tellurites - Sulfites
  (34.03)Dana Type
  (34.03.04)Dana Group Mandarinoite Fe2Se3O9•6(H2O) P 21/c 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( MinRec, v 34, p 350) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 04.JH.15





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