Romerite Mineral Data

Romerite Mineral Data +

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General Romerite Information

Chemical Formula:

Fe3(SO4)4·14(H2O)

Composition:

Molecular Weight = 804.01 gm

Iron 20.84 % Fe 26.81 % FeO

Hydrogen 3.51 % H 31.37 % H₂O

Sulfur 15.95 % S 39.83 % SO₃

Oxygen 59.70 % O

______ ______

100.00 % 98.01 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺₃(SO₄)₄·14(H₂O)

Environment:

Secondary mineral in the oxidized portions of iron sulfide ore bodies.

IMA Status:

Valid Species (Pre-IMA) 1858

Locality:

Rammelsberg, Harz, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Friedrich Adolph Römer (1809-1869), German geologist.

Synonym:

Louderbackite

Roemerite

Romerite Image

Images:

Romerite

Comments: Massive, pale reddish-brown R?merite.
Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Specimen size 5.8 cm.
© Thomas Witzke / Abraxas-Verlag

Romerite Crystallography

Axial Ratios:

a:b:c =0.4221:1:0.4142

Cell Dimensions:

a = 6.463, b = 15.309, c = 6.341, Z = 1; alpha = 90.533°, beta = 101.083°, gamma = 85.733° V = 613.96 Den(Calc)= 2.17

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 4.811(1), 4.046(0.69), 5.058(0.43),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Fanfani L , Nunzi A , Zanazzi P F , American Mineralogist , 55 (1970) p.78-89, The crystal structure of roemerite

Physical Properties of Romerite

Cleavage:

[010] Perfect, [001] Good

Color:

Brown, Yellow, Violet brown.

Density:

2.15

Diaphaniety:

Translucent

Fracture:

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

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

3-3.5 - Calcite-Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Resinous

Optical Properties of Romerite

Gladstone-Dale:

CI meas= -0.14 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.13 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2571,KPDmeas= 0.2595,KC= 0.2276

Optical Data:

Biaxial (-), a=1.519-1.524, b=1.57-1.571, g=1.58-1.583, bire=0.0590-0.0610, 2V(Calc)=46-52, 2V(Meas)=45-51. Dispersion r > v very strong.

Pleochroism (x):

reddish yellow.

Pleochroism (y):

pale yellow.

Pleochroism (z):

yellow brown.

Calculated Properties of Romerite

Electron Density:

r_electron=2.21 gm/cc
note: r_Romerite=2.17 gm/cc.

Fermion Index

Fermion Index = 0.0059
Boson Index = 0.9941

Photoelectric:

PE_Romerite= 7.01 barns/electron
U=PE_Romerite x r_electron= 15.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Romerite is Not Radioactive

Romerite Classification

Dana Class:

29.7.2.1 (29)Hydrated Acid and Sulfates

(29.7)where A (B)2 (XO4)4 · x(H2O)

(29.7.2)Dana Group

29.7.2.1 Romerite Fe3(SO4)4·14(H2O) P1 1

29.7.2.2 Lishizhenite ZnFe2(SO4)4·14(H2O) P1 1

Strunz Class:

VI/C.11-10 VI - Sulfates,Chromates,Molybdates and Tungstates

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

VI/C.11 - Römerite - Ransomite series

VI/C.11-10 Romerite Fe3(SO4)4·14(H2O) P1 1

VI/C.11-15 Lishizhenite ZnFe2(SO4)4·14(H2O) P1 1

VI/C.11-20 Ransomite CuFe2(SO4)4·6(H2O) P 2₁/c 2/m

Other Romerite Information

References:

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

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Romerite

Fe3(SO4)4·14(H2O)
Dana No: 29.7.2.1 Strunz No: VI/C.11-10
Locality:

Notes: