Romerite Mineral Data

General Romerite Information

Chemical Formula:

Fe++Fe+++2(SO4)4•14(H2O)

Composition:

Molecular Weight = 798.11 gm

Iron 20.92 % Fe 8.73 % FeO / 20.21 % Fe₂O₃

Hydrogen 3.49 % H 31.17 % H₂O

Sulfur 15.99 % S 39.93 % SO₃

Oxygen 59.60 % O

______ ______

100.00 % 100.04 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_0.97Fe³⁺_2.02(SO₄)_3.98•13.81(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 Rï¿½mer (1809-1869), German geologist.

Name Pronunciation:

Romerite

Synonym:

Louderbackite

Roemerite

Romerite Image

Images:

Romerite

Comments: Massive, pale reddish-brown RÃ¶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)= 2.16

Crystal System:

Triclinic - Pinacoidal H-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),

Physical Properties of Romerite

Cleavage:

{010} Perfect, {001} Good

Color:

Brown, Yellow, Violet brown.

Density:

2.15

Diaphaneity:

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= -0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2583,KPDmeas= 0.2595,KC= 0.2567
Ncalc = 1.55

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:

Bulk Density (Electron Density)=2.20 gm/cc
note: Specific Gravity of Romerite =2.16 gm/cc.

Fermion Index:

Fermion Index = 0.005926142
Boson Index = 0.994073858

Photoelectric:

PE_Romerite= 7.04 barns/electron
U=PE_Romerite x rElectron Density= 15.50 barns/cc.

Radioactivity:

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

Romerite Classification

Dana Class:

29.07.02.01 (29)Hydrated Acid and Sulfates

(29.07)where A (B)2 (XO4)4 ï¿½ x(H2O)

(29.07.02)Dana Group

29.07.02.01 Romerite FeFe2(SO4)4•14(H2O) P1 1

29.07.02.02 Lishizhenite ZnFe2(SO4)4•14(H2O) P1 1

Strunz Class:

07.CB.75 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CB -With only medium-sized cations

07.CB.75 Lishizhenite ZnFe2(SO4)4•14(H2O) P1 1

07.CB.75 Romerite FeFe2(SO4)4•14(H2O) P1 1

Other Romerite Information

References:

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

See Also:

Links to other databases for Romerite :
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
15 - WWW-MINCRYST
16 - YupRocks

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Print or Cut-and-Paste your Romerite Specimen Label here :

Romerite

Fe++Fe+++2(SO4)4•14(H2O)
Dana No: 29.07.02.01 Strunz No: 07.CB.75
Locality:

Notes:

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