Sideronatrite Mineral Data

Sideronatrite Mineral Data +

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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.

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 - DipyramidalH-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

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:

r_electron=2.29 gm/cc
note: r_{Sideronatrite}=2.28 gm/cc.

Fermion Index

Fermion Index = 0.00481
Boson Index = 0.99519

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sideronatrite is Not Radioactive

Sideronatrite Classification

Dana Class:

31.8.3.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.8)where (A+ B++)3 (XO4)2 Zq·x(H2O)

(31.8.3)Dana Group

31.8.3.1 Sideronatrite Na2Fe(SO4)2(OH)·3(H2O) Pbnm 2/m 2/m 2/m

Strunz Class:

VI/D.15-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size

VI/D.15 - Sideronatrite - Clairite series

VI/D.15-10 Sideronatrite Na2Fe(SO4)2(OH)·3(H2O) Pbnm 2/m 2/m 2/m

VI/D.15-20 Metasideronatrite Na2Fe(SO4)2(OH)·(H2O) Pbnm or Pbn21 Ortho

VI/D.15-30 Clairite (NH4)2Fe3(SO4)4(OH)3·3(H2O) Unk Tri

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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Sideronatrite

Na2Fe+++(SO4)2(OH)·3(H2O)
Dana No: 31.8.3.1 Strunz No: VI/D.15-10
Locality:

Notes: