Romeite Mineral Data

Romeite Mineral Data +

[Localities] [Carat Weight] [Special Collections] [Diamond Lots] [Ordering Info]
See Also: [Excalibur Minerals] [Mineral News] [Hudson Institute] [Minerals on CDROM]
Special Collections of Rough Diamonds for Researchers and Collectors
Unparalled diversity of specimens from different locations

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

IMA Status:

Valid Species (Pre-IMA) 1841

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after the French crystallographer, J. B. Rome de I'lsle (1736-1770).

Synonym:

Antimony ochre

Atopite

Lewisite - Mn deficient

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),

Physical Properties of Romeite

Cleavage:

[111] Imperfect, [111] Imperfect, [111] Imperfect

Color:

White, Yellow, Yellowish brown.

Density:

4.7 - 5.4, Average = 5.05

Diaphaniety:

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

Optical Data:

Isotropic, n=1.83-1.87.

Calculated Properties of Romeite

Electron Density:

r_electron=4.62 gm/cc
note: r_Romeite=5.05 gm/cc.

Fermion Index

Fermion Index = 0.00955
Boson Index = 0.99045

Photoelectric:

PE_Romeite= 148.95 barns/electron
U=PE_Romeite x r_electron= 688.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Romeite is Not Radioactive

Romeite Classification

Dana Class:

44.1.1.3 (44)Antimonates

(44.1)(A)2 (X2 O6) (O,OH,F)

(44.1.1)Dana Group

44.1.1.1 Stibiconite SbSb2O6(OH) F d3m 4/m 3 2/m

44.1.1.2 Bindheimite Pb2Sb2O6(O,OH) F d3m 4/m 3 2/m

44.1.1.3 Romeite (Ca,Fe,Mn,Na)2(Sb,Ti)2O6(O,OH,F) F d3m 4/m 3 2/m

44.1.1.3a Lewisite! (Ca,Fe,Na)2(Sb,Ti)2O7 F d3m 4/m 3 2/m

44.1.1.4 Monimolite (Pb,Ca)2Sb2O7 F d3m 4/m 3 2/m

44.1.1.5 Stetefeldtite Ag2Sb2O6(O,OH) F d3m 4/m 3 2/m

44.1.1.6 Bismutostibiconite Bi(Sb,Fe)2O7 F d3m 4/m 3 2/m

44.1.1.7 Partzite Cu2Sb2(O,OH)7(?) F d3m 4/m 3 2/m

Strunz Class:

IV/C.11-40 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.11 - Stibiconite group, Partzite - Bindheimite series

IV/C.11-10 Partzite Cu2Sb2(O,OH)7(?) F d3m 4/m 3 2/m

IV/C.11-20 Stetefeldtite Ag2Sb2O6(O,OH) F d3m 4/m 3 2/m

IV/C.11-30 Lewisite (Ca,Fe,Na)2(Sb,Ti)2O7 F d3m 4/m 3 2/m

IV/C.11-40 Romeite (Ca,Fe,Mn,Na)2(Sb,Ti)2O6(O,OH,F) F d3m 4/m 3 2/m

IV/C.11-50 Stibiconite SbSb2O6(OH) F d3m 4/m 3 2/m

IV/C.11-60 Bismutostibiconite Bi(Sb,Fe)2O7 F d3m 4/m 3 2/m

IV/C.11-70 Bindheimite Pb2Sb2O6(O,OH) F d3m 4/m 3 2/m

Other Romeite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

Search for Romeite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Romeite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Romeite Mineral Data :

Ask about Romeite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Romeite

(Ca,Fe++,Mn,Na)2(Sb,Ti)2O6(O,OH,F)
Dana No: 44.1.1.3 Strunz No: IV/C.11-40
Locality:

Notes: