Ferrohexahydrite Mineral Data

Ferrohexahydrite Mineral Data +

General Ferrohexahydrite Information

Chemical Formula:

Fe++SO4·6(H2O)

Composition:

Molecular Weight = 260.00 gm

Iron 21.48 % Fe 27.63 % FeO

Hydrogen 4.65 % H 41.57 % H₂O

Sulfur 12.33 % S 30.79 % SO₃

Oxygen 61.54 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺(SO₄)·6(H₂O)

IMA Status:

Approved IMA 1962

Locality:

Sofiya Mine, Nikitovka Deposit, Novyy Donbass, Gorlovka, Doneck Oblast', Ukraine Link to MinDat.org Location Data.

Name Origin:

Named for the composition, FERROus iron and HEXAHYDrate in allusion to the six water molecules in the crystal structure.

Ferrohexahydrite Image

Images:

Ferrohexahydrite

Comments: White to light brownish crust of ferrohexahydrite on matrix.
Location: Sohland, Bautzen, Oberlausitz, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Ferrohexahydrite Crystallography

Axial Ratios:

a:b:c =1.3846:1:3.3777

Cell Dimensions:

a = 10.08, b = 7.28, c = 24.59, Z = 8; beta = 98.3° V = 1,785.57 Den(Calc)= 1.93

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 4.43(1), 2.93(0.7), 2.97(0.7),

Physical Properties of Ferrohexahydrite

Color:

Colorless.

Density:

1.934

Diaphaniety:

Transparent

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ferrohexahydrite

Gladstone-Dale:

CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2503,KPDmeas= 0.2497,KC= 0.2478

Optical Data:

Biaxial (?), a=1.468, g=1.498, bire=0.0300

Calculated Properties of Ferrohexahydrite

Electron Density:

r_electron=1.99 gm/cc
note: r_{Ferrohexahydrite}=1.93 gm/cc.

Fermion Index

Fermion Index = 0.00578
Boson Index = 0.99422

Photoelectric:

PE_{Ferrohexahydrite}= 6.93 barns/electron
U=PE_{Ferrohexahydrite} x r_electron= 13.82 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferrohexahydrite is Not Radioactive

Ferrohexahydrite Classification

Dana Class:

29.6.8.3 (29)Hydrated Acid and Sulfates

(29.6)where A XO4 · x(H2O)

(29.6.8)Hexahydrite Group (Space Group: C2/c)

29.6.8.1 Hexahydrite MgSO4·6(H2O) A2/a 2/m

29.6.8.2 Bianchite (Zn,Fe)(SO4)·6(H2O) C 2/c 2/m

29.6.8.3 Ferrohexahydrite FeSO4·6(H2O) C 2/c 2/m

29.6.8.4 Nickelhexahydrite (Ni,Mg,Fe)(SO4)·6(H2O) C 2/c 2/m

29.6.8.5 Moorhouseite (Co,Ni,Mn)SO4·6(H2O) C 2/c 2/m

29.6.8.6 Chvaleticeite (Mn,Mg)SO4·6(H2O) C 2/c 2/m

Strunz Class:

VI/C.05-20 VI - Sulfates,Chromates,Molybdates and Tungstates

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

VI/C.05 - Hexahydrite group

VI/C.05-10 Hexahydrite MgSO4·6(H2O) A2/a 2/m

VI/C.05-20 Ferrohexahydrite FeSO4·6(H2O) C 2/c 2/m

VI/C.05-30 Chvaleticeite (Mn,Mg)SO4·6(H2O) C 2/c 2/m

VI/C.05-40 Moorhouseite (Co,Ni,Mn)SO4·6(H2O) C 2/c 2/m

VI/C.05-50 Nickelhexahydrite (Ni,Mg,Fe)(SO4)·6(H2O) C 2/c 2/m

VI/C.05-60 Bianchite (Zn,Fe)(SO4)·6(H2O) C 2/c 2/m

VI/C.05-70 Retgersite NiSO4·6(H2O) P 4₁2₁2,P 4₃2₁2 4 2 2

Other Ferrohexahydrite 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 Ferrohexahydrite :
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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Ferrohexahydrite

Fe++SO4·6(H2O)
Dana No: 29.6.8.3 Strunz No: VI/C.05-20
Locality:

Notes: