Romeite Mineral Data (original) (raw)
General Romeite Information
Chemical Formula:
(Ca,Fe++,Mn,Na)2(Sb,Ti)2O6(O,OH,F)
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
______ ______
100.00 % 99.61 % = TOTAL OXIDE
Empirical Formula:
Ca1.1Fe2+0.6Mn2+0.2Na0.1Sb1.5Ti0.5O6.6(OH)0.3F0.1
Environment:
Accessory mineral in metamorphosed manganese ores.
IMA Status:
Valid Species (Pre-IMA) 1841
Locality:
San Marcel mine, Piedmont, near Vipiteno, Italy. Link to MinDat.org Location Data.
Name Origin:
Named after the French crystallographer, Rome de I'lsle (1736-1770).
Name Pronunciation:
Romeite 
Synonym:
Antimony ochre
Atopite
Lewisite - Mn deficient, Ti-bearing romeite
Romeite Image
Images:
Romeite Crystallography
Cell Dimensions:
a = 10.284, Z = 11; V = 1,087.64 Den(Calc)= 6.89
Crystal System:
Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m
X Ray Diffraction:
By Intensity(I/Io): 2.95(1), 1.827(0.8), 6(0.8),
Crystal Structure:
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| | Natta G , Baccaredda M , Zeitschrift fur Kristallographie , 85 (1933) p.271-296, Tetrossido di antimonio e antimoniati | | ------------------------------------------------------------------------------------------------------------------------- |
Physical Properties of Romeite
Cleavage:
{111} Imperfect, {111} Imperfect, {111} Imperfect
Color:
White, Yellow, Yellowish brown.
Density:
4.7 - 5.4, Average = 5.05
Diaphaneity:
Transparent to Subopaque
Fracture:
Hackly - Jagged, torn surfaces, (e.g. fractured metals).
Habit:
Encrustations - Forms crust-like aggregates on matrix.
Habit:
Pulverulent - Forms a loose, poorly-coherent powdery mass.
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luster:
Vitreous - Greasy
Streak:
brownish yellow
Optical Properties of Romeite
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
Optical Data:
Isotropic, n=1.83-1.87.
Calculated Properties of Romeite
Electron Density:
Bulk Density (Electron Density)=4.62 gm/cc
note: Specific Gravity of Romeite =5.05 gm/cc.
Fermion Index:
Fermion Index = 0.009555975
Boson Index = 0.990444025
Photoelectric:
PERomeite = 148.95 barns/electron
U=PERomeite x rElectron Density= 688.27 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Romeite is Not Radioactive
Romeite Classification
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
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
References:
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
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: