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Sarmientite Mineral Data

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General Sarmientite Information

Help on Chemical  Formula: Chemical Formula: Fe+++2(AsO4)(SO4)(OH)•5(H2O)
Help on Composition: Composition: Molecular Weight = 453.76 gm
   Iron      24.62 %  Fe   35.19 % Fe2O3
   Arsenic   16.51 %  As   25.33 % As2O5
   Hydrogen   2.44 %  H    21.84 % H2O
   Sulfur     7.07 %  S    17.64 % SO3
   Oxygen    49.36 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+2(AsO4)(SO4)(OH)•5(H2O)
Help on Environment: Environment: Rare mineral in oxidized pyritic veins in diabase.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1941
Help on Locality: Locality: Santa Elena mine, Quebrada de La Alcaparrosa, between San Juan and Calingasta, San Juan Province, Argentina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Domingo Faustino Sarmiento (1811-1888), former President of Argentina.

Sarmientite Image

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Comments: Pale olive-green chalky massive sarmientite.
Location: Kotzebue, Alaska, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sarmientite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.353:1:0.5229
Help on Cell Dimensions: Cell Dimensions: a = 6.55, b = 18.55, c = 9.7, Z = 4; beta = 97.65° V = 1,168.08 Den(Calc)= 2.58
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): 9.29(1), 4.64(0.9), 4.26(0.8),

Physical Properties of Sarmientite

Help on Color: Color: Yellow orange, Light yellow, Light orange.
Help on Density: Density: 2.58
Help on Streak: Streak: white

Optical Properties of Sarmientite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2534,KPDmeas= 0.2534,KC= 0.2574
Ncalc = 1.66
Help on Optical Data: Optical Data: Biaxial (+), a=1.628, b=1.635, g=1.698, bire=0.0700, 2V(Calc)=38, 2V(Meas)=38.

Calculated Properties of Sarmientite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.55 gm/cc
note: Specific Gravity of Sarmientite =2.58 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.005989033
Boson Index = 0.994010967
Help on Photoelectric: Photoelectric: PESarmientite = 18.60 barns/electron
U=PESarmientite x rElectron Density= 47.38 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sarmientite is Not Radioactive

Sarmientite Classification

Help on  Dana Class: Dana Class: (43)Compound Phosphates, etc.
  (43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)
  (43.05.01)Sarmientite Group Sarmientite Fe2(AsO4)(SO4)(OH)•5(H2O) P 21/c 2/m Bukovskyite Fe2(AsO4)(SO4)(OH)•7(H2O) P1 or P1 Tri Sanjuanite Al2(PO4)(SO4)(OH)•9(H2O) P1 or P1 Tri
Help on  Strunz Class: Strunz Class: 08.DB.35 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DB -With only medium-sized cations, (OH, etc.):RO4 < 1:1
08.DB.35 Sarmientite Fe2(AsO4)(SO4)(OH)•5(H2O) P 21/c 2/m

Other Sarmientite Information

Help on References: References: NAME( AntBidBlaNic4) 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 Sarmientite :
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: 08.DB.35





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