Romeite Mineral Data

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

- % F -0.20 % -O=F₂

______ ______

100.00 % 99.61 % = TOTAL OXIDE

Empirical Formula:

Ca_1.1Fe²⁺_0.6Mn²⁺_0.2Na_0.1Sb_1.5Ti_0.5O_6.6(OH)_0.3F_0.1

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

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

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

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

By Intensity(I/I_o): 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:

PE_Romeite= 148.95 barns/electron
U=PE_Romeite 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: