Szomolnokite Mineral Data

Szomolnokite Mineral Data +

General Szomolnokite Information

Chemical Formula:

Fe++SO4·(H2O)

Composition:

Molecular Weight = 169.93 gm

Iron 32.87 % Fe 42.28 % FeO

Hydrogen 1.19 % H 10.60 % H₂O

Sulfur 18.87 % S 47.12 % SO₃

Oxygen 47.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺(SO₄)·(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1877

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 71345

PDF 45-1365

Szomolnokite Image

Images:

Click Here for Larger Szomolnokite Image

Szomolnokite Voltaite

Comments: Whitish crystalline crust of voltaite on crystals of brown szomolnokite.
Location: Alcaparrosa Mine, Cerritos Bayos, Chile. Scale: Picture size 1 cm.
© John Veevaert

Images:

Szomolnokite Halotrichite

Comments: Tan powdery szomolnokite crust on silky fibrous halotrichite with yellow metavoltine.
Location: Markey Mine, Red Canyon, San Juan County, Utah, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Szomolnokite Crystallography

Axial Ratios:

a:b:c =1.0208:1:0.9538

Cell Dimensions:

a = 7.624, b = 7.468, c = 7.123, Z = 4; beta = 115.867° V = 364.92 Den(Calc)= 3.09

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a

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

By Intensity(I/I_o): 3.44(1), 3.12(0.4), 2.52(0.35),

Crystal Structure:

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Wildner M , Giester G , Neues Jahrbuch fur Mineralogie, Monatshefte , 1991 (1991) p.296-306, The crystal structures of kieserite-type compounds., I. Crystal structures of Me(II)SO4*H2O (Me = Mn,Fe,Co,Ni,Zn), Locality: synthetic

Physical Properties of Szomolnokite

Cleavage:

[???] Indistinct

Color:

Bluish, Colorless, Yellow, Yellow brown, Light blue.

Density:

3.03 - 3.07, Average = 3.05

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Szomolnokite

Gladstone-Dale:

CI meas= -0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2025,KPDmeas= 0.2051,KC= 0.1989

Optical Data:

Biaxial (+), a=1.591, b=1.623, g=1.663, bire=0.0720, 2V(Calc)=86, 2V(Meas)=80.

Calculated Properties of Szomolnokite

Electron Density:

r_electron=3.05 gm/cc
note: r_Szomolnokite=3.09 gm/cc.

Fermion Index

Fermion Index = 0.00861
Boson Index = 0.99139

Photoelectric:

PE_Szomolnokite= 10.85 barns/electron
U=PE_Szomolnokite x r_electron= 33.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Szomolnokite is Not Radioactive

Szomolnokite Classification

Dana Class:

29.6.2.2 (29)Hydrated Acid and Sulfates

(29.6)where A XO4 · x(H2O)

(29.6.2)Kieserite Group (Mono-hydrates)

29.6.2.1 Kieserite MgSO4·(H2O) C 2/c 2/m

29.6.2.2 Szomolnokite FeSO4·(H2O) A2/a 2/m

29.6.2.3 Szmikite MnSO4·(H2O) A2/a 2/m

29.6.2.4 Poitevinite (Cu,Fe,Zn)SO4·(H2O) P1 1

29.6.2.5 Gunningite (Zn,Mn)SO4·(H2O) A2/a 2/m

29.6.2.6 Dwornikite (Ni,Fe)SO4·(H2O) C 2/c 2/m

29.6.2.7 Cobaltkieserite! CoSO4·H2O C 2/c 2/m

Strunz Class:

VI/C.01-20 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium size

VI/C.01 - Kieserite group

VI/C.01-10 Kieserite MgSO4·(H2O) C 2/c 2/m

VI/C.01-20 Szomolnokite FeSO4·(H2O) A2/a 2/m

VI/C.01-30 Szmikite MnSO4·(H2O) A2/a 2/m

VI/C.01-35 Cobaltkieserite! CoSO4·H2O C 2/c 2/m

VI/C.01-40 Dwornikite (Ni,Fe)SO4·(H2O) C 2/c 2/m

VI/C.01-50 Poitevinite (Cu,Fe,Zn)SO4·(H2O) P1 1

VI/C.01-60 Gunningite (Zn,Mn)SO4·(H2O) A2/a 2/m

VI/C.01-70 Sanderite MgSO4·2(H2O) Mono ? Mono

Other Szomolnokite Information

References:

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

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Szomolnokite

Fe++SO4·(H2O)
Dana No: 29.6.2.2 Strunz No: VI/C.01-20
Locality:

Notes: