Romeite Mineral Data

Romeite Mineral Data
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General Romeite Information

Help on Chemical Formula: Chemical Formula: (Ca,Fe++,Mn,Na)2(Sb,Ti)2O6(O,OH,F)
Help on Composition: Composition: Molecular Weight = 410.04 gm
   Sodium      0.56 %  Na    0.76 % Na2O
   Calcium    10.75 %  Ca   15.04 % CaO
   Titanium    5.84 %  Ti    9.74 % TiO2
   Manganese   2.68 %  Mn    3.46 % MnO
   Iron        8.17 %  Fe   10.51 % FeO
   Antimony   44.54 %  Sb   59.17 % Sb2O5
   Hydrogen    0.07 %  H     0.66 % H2O
   Oxygen     26.92 %  O
   Fluorine    0.46 %  F     0.46 % F
                -   %   F    -0.20 % -O=F2    
             ______        ______ 
             100.00 %       99.61 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.1Fe2+0.6Mn2+0.2Na0.1Sb1.5Ti0.5O6.6(OH)0.3F0.1
Help on Environment: Environment: Accessory mineral in metamorphosed manganese ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1841
Help on Locality: Locality: San Marcel mine, Piedmont, near Vipiteno, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the French crystallographer, Rome de I'lsle (1736-1770).
Help on Name Pronunciation: Name Pronunciation: Romeite Say ROMEITE
Help on Synonym: Synonym: Antimony ochre
  Atopite
  Lewisite - Mn deficient, Ti-bearing romeite
 

Romeite Image

Click Here for Larger Romeite Image in a New Browser Window Images:
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Romeite

Comments: Tan fibrous romeite on quartz.
Location: Sant Marcel, Piemonte, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Romeite Crystallography
Help on Cell Dimensions: Cell Dimensions: a = 10.284, Z = 11; V = 1,087.64 Den(Calc)= 6.89
Help on Crystal System: Crystal System: Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.95(1), 1.827(0.8), 6(0.8),
Click Here for Large Romeite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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 Help on Above


Natta G , Baccaredda M , Zeitschrift fur Kristallographie , 85 (1933) p.271-296, Tetrossido di antimonio e antimoniati

 

Physical Properties of Romeite

Help on Cleavage: Cleavage: {111} Imperfect, {111} Imperfect, {111} Imperfect
Help on Color: Color: White, Yellow, Yellowish brown.
Help on Density: Density: 4.7 - 5.4, Average = 5.05
Help on Diaphaneity: Diaphaneity: Transparent to Subopaque
Help on Fracture: Fracture: Hackly - Jagged, torn surfaces, (e.g. fractured metals).
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Pulverulent - Forms a loose, poorly-coherent powdery mass.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: brownish yellow
 

Optical Properties of Romeite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.118 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.354 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1234,KPDmeas= 0.1683,KC= 0.1909
Ncalc = 1.9 - 2.32
Help on Optical Data: Optical Data: Isotropic, n=1.83-1.87.
 

Calculated Properties of Romeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.62 gm/cc
note: Specific Gravity of Romeite =5.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.009555975
Boson Index = 0.990444025
Help on Photoelectric: Photoelectric: PERomeite = 148.95 barns/electron
U=PERomeite x rElectron Density= 688.27 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Romeite is Not Radioactive
 

Romeite Classification
Help on Dana Class: Dana Class: 44.01.01.03 (44)Antimonates
  (44.01)(A)2 (X2 O6) (O,OH,F)
  (44.01.01)Stibiconite Group
 
44.01.01.01 Stibiconite SbSb2O6(OH) F d3m 4/m 3 2/m
 
44.01.01.02 Bindheimite Pb2Sb2O6(O,OH) F d3m 4/m 3 2/m
 
44.01.01.03 Romeite (Ca,Fe,Mn,Na)2(Sb,Ti)2O6(O,OH,F) F d3m 4/m 3 2/m
 
44.01.01.03a Lewisite? (Ca,Fe,Na)2(Sb,Ti)2O7 F d3m 4/m 3 2/m
 
44.01.01.04 Monimolite (Pb,Ca)2Sb2O7 F d3m 4/m 3 2/m
 
44.01.01.05 Stetefeldtite Ag2Sb2O6(O,OH) F d3m 4/m 3 2/m
 
44.01.01.06 Bismutostibiconite Bi(Sb,Fe)2O7 F d3m 4/m 3 2/m
 
44.01.01.07 Partzite Cu2Sb2(O,OH)7(?) F d3m 4/m 3 2/m
Help on Strunz Class: Strunz Class: 04.DH.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DH -With large (± medium-sized) cations; sheets of edge-sharing octahedra
 
04.DH.20 Bismutostibiconite Bi(Sb,Fe)2O7 F d3m 4/m 3 2/m
 
04.DH.20 Bindheimite Pb2Sb2O6(O,OH) F d3m 4/m 3 2/m
 
04.DH.20 Monimolite (Pb,Ca)2Sb2O7 F d3m 4/m 3 2/m
 
04.DH.20 Partzite Cu2Sb2(O,OH)7(?) F d3m 4/m 3 2/m
 
04.DH.20 Stetefeldtite Ag2Sb2O6(O,OH) F d3m 4/m 3 2/m
 
04.DH.20 Romeite (Ca,Fe,Mn,Na)2(Sb,Ti)2O6(O,OH,F) F d3m 4/m 3 2/m
 
04.DH.20 Stibiconite SbSb2O6(OH) F d3m 4/m 3 2/m
 

Other Romeite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Romeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Romeite

(Ca,Fe++,Mn,Na)2(Sb,Ti)2O6(O,OH,F)
Dana No: 44.01.01.03 Strunz No: 04.DH.20
Locality:

 

Notes: