Mineralogy Database

Romerite Mineral Data

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General Romerite Information

Help on Chemical  Formula: Chemical Formula: Fe++Fe+++2(SO4)4•14(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe2+0.97Fe3+2.02(SO4)3.98•13.81(H2O)
Help on Environment: Environment: Secondary mineral in the oxidized portions of iron sulfide ore bodies.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1858
Help on Locality: Locality: Rammelsberg, Harz, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Friedrich Adolph R�mer (1809-1869), German geologist.
Help on Name Pronunciation: Name Pronunciation: Romerite Say ROMERITE
Help on Synonym: Synonym: Louderbackite

Romerite Image

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

Romerite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4221:1:0.4142
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.811(1), 4.046(0.69), 5.058(0.43),

Physical Properties of Romerite

Help on Cleavage: Cleavage: {010} Perfect, {001} Good
Help on Color: Color: Brown, Yellow, Violet brown.
Help on Density: Density: 2.15
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Resinous

Optical Properties of Romerite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): reddish yellow.
Help on Pleochroism (y): Pleochroism (y): pale yellow.
Help on Pleochroism (z): Pleochroism (z): yellow brown.

Calculated Properties of Romerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.20 gm/cc
note: Specific Gravity of Romerite =2.16 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.005926142
Boson Index = 0.994073858
Help on Photoelectric: Photoelectric: PERomerite = 7.04 barns/electron
U=PERomerite x rElectron Density= 15.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Romerite is Not Radioactive

Romerite Classification

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.07)where A (B)2 (XO4)4 � x(H2O)
  (29.07.02)Dana Group Romerite FeFe2(SO4)4•14(H2O) P1 1 Lishizhenite ZnFe2(SO4)4•14(H2O) P1 1
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: 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
16 - YupRocks

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Dana No: Strunz No: 07.CB.75





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