Sideronatrite Mineral Data

General Sideronatrite Information

Chemical Formula:

Na2Fe+++(SO4)2(OH)•3(H2O)

Composition:

Molecular Weight = 365.01 gm

Sodium 12.60 % Na 16.98 % Na₂O

Iron 15.30 % Fe 21.88 % Fe₂O₃

Hydrogen 1.93 % H 17.27 % H₂O

Sulfur 17.57 % S 43.87 % SO₃

Oxygen 52.60 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Fe³⁺(SO₄)₂(OH)•3(H₂O)

Environment:

Secondary mineral found in arid regions.

IMA Status:

Valid Species (Pre-IMA) 1878

Locality:

San Simon mine, Huantajaya, Tarapaca, Chile. Link to MinDat.org Location Data.

Name Origin:

Named after its composition.

Name Pronunciation:

Sideronatrite + Pronunciation

Synonym:

Urusite

Sideronatrite Image

Images:

Sideronatrite

Comments: Golden yellow acicular sprays of sideronatrite crystals on matrix.
Location: Sulfur pit, Crescent Valley, Nevada, USA. Scale: 6 x 5 x 4 cm.
© John Veevaert

Sideronatrite Crystallography

Axial Ratios:

a:b:c =0.3546:1:0.3487

Cell Dimensions:

a = 7.27, b = 20.5, c = 7.15, Z = 4; V = 1,065.60 Den(Calc)= 2.28

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

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

By Intensity(I/I_o): 10.2(1), 3.01(0.8), 3.38(0.6),

Physical Properties of Sideronatrite

Cleavage:

{100} Perfect

Color:

Yellow, Yellow, Yellow brown, Pale orange.

Density:

2 - 2.5, Average = 2.25

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Vitreous - Dull

Streak:

pale yellow

Optical Properties of Sideronatrite

Gladstone-Dale:

CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2367,KPDmeas= 0.2399,KC= 0.2376
Ncalc = 1.48 - 1.59

Optical Data:

Biaxial (+), a=1.508, b=1.525, g=1.586, bire=0.0780, 2V(Calc)=58, 2V(Meas)=58. Dispersion r > v strong.

Pleochroism (x):

nearly colorless.

Pleochroism (y):

pale amber yellow.

Pleochroism (z):

pale yellow.

Calculated Properties of Sideronatrite

Electron Density:

Bulk Density (Electron Density)=2.29 gm/cc
note: Specific Gravity of Sideronatrite =2.28 gm/cc.

Fermion Index:

Fermion Index = 0.004816789
Boson Index = 0.995183211

Photoelectric:

PE_{Sideronatrite}= 5.76 barns/electron
U=PE_{Sideronatrite} x rElectron Density= 13.16 barns/cc.

Radioactivity:

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

Sideronatrite Classification

Dana Class:

31.08.03.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.08)where (A+ B++)3 (XO4)2 Zqï¿½x(H2O)

(31.08.03)Dana Group

31.08.03.01 Sideronatrite Na2Fe(SO4)2(OH)•3(H2O) Pbnm 2/m 2/m 2/m

Strunz Class:

07.DF.20 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DF -With large and medium-sized cations

07.DF.20 Metasideronatrite Na2Fe(SO4)2(OH)•(H2O) Pbnm or Pbn21 Ortho

07.DF.20 Sideronatrite Na2Fe(SO4)2(OH)•3(H2O) Pbnm 2/m 2/m 2/m

Other Sideronatrite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Sideronatrite :
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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Sideronatrite

Na2Fe+++(SO4)2(OH)•3(H2O)
Dana No: 31.08.03.01 Strunz No: 07.DF.20
Locality:

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