Sarmientite Mineral Data

Sarmientite Mineral Data

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General Sarmientite Information

Chemical Formula:

Fe+++2(AsO4)(SO4)(OH)·5(H2O)

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

Empirical Formula:

Fe³⁺₂(AsO₄)(SO₄)(OH)·5(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1941

Locality:

Link to MinDat.org Location Data.

Sarmientite Image

Images:

Sarmientite

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

Sarmientite Crystallography

Axial Ratios:

a:b:c =0.353:1:0.5229

Cell Dimensions:

a = 6.55, b = 18.55, c = 9.7, Z = 4; beta = 97.65° V = 1,168.08 Den(Calc)= 2.58

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): 9.29(1), 4.64(0.9), 4.26(0.8),

Physical Properties of Sarmientite

Color:

Yellow orange, Light yellow, Light orange.

Density:

2.58

Streak:

white

Optical Properties of Sarmientite

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

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

Electron Density:

r_electron=2.55 gm/cc
note: r_Sarmientite=2.58 gm/cc.

Fermion Index

Fermion Index = 0.00598
Boson Index = 0.99402

Photoelectric:

PE_Sarmientite= 18.60 barns/electron
U=PE_Sarmientite x r_electron= 47.38 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sarmientite is Not Radioactive

Sarmientite Classification

Dana Class:

43.5.1.1 (43)Compound Phosphates, etc.

(43.5)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.5.1)Dana Group

43.5.1.1 Sarmientite Fe2(AsO4)(SO4)(OH)·5(H2O) P 2₁/c 2/m

43.5.1.2 Bukovskyite Fe2(AsO4)(SO4)(OH)·7(H2O) P1 or P1 Tri

43.5.1.3 Sanjuanite Al2(PO4)(SO4)(OH)·9(H2O) P1 or P1 Tri

Strunz Class:

VII/D.05-30 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.05 - Pitticite - Zykaite series

VII/D.05-10 Pitticite Hydrousferricarsenatesulfate(Fe,AsO4,SO4,H2O) None

VII/D.05-20 Diadochite Fe2(PO4)(SO4)(OH)·6(H2O) P1 1

VII/D.05-30 Sarmientite Fe2(AsO4)(SO4)(OH)·5(H2O) P 2₁/c 2/m

VII/D.05-40 Bukovskyite Fe2(AsO4)(SO4)(OH)·7(H2O) P1 or P1 Tri

VII/D.05-50 Tooeleite Fe(8-2x)[(As(1-x),S(x))O4]6·5(H2O) Pbcm,Pbc21 Ortho

VII/D.05-60 Zykaite Fe4(AsO4)3(SO4)(OH)·15(H2O) Unk Ortho

Other Sarmientite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Sarmientite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Sarmientite

Fe+++2(AsO4)(SO4)(OH)·5(H2O)
Dana No: 43.5.1.1 Strunz No: VII/D.05-30
Locality:

Notes: