Pronunciation Guide 
General Information |
|
 Chemical Formula: |
(Ca,Fe++,Mn,Na)2(Sb,Ti)2O6(O,OH,F) |
| Name Origin: |
Named after the French crystallographer, J. B. Rome de I'lsle (1736-1770). |
| Synonym: |
Antimony ochre |
| Atopite | |
Classification |
|
| Dana Class: |
44.1.1.3 (44)Antimonates |
| (44.1)(A)2 (X2 O6) (O,OH,F) | |
| (44.1.1)Dana Group | |
| 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 | |
Crystallography |
|
| Cell Dimensions: |
a = 10.284, Z = 8; V = 1,087.64 |
| Crystal System: |
Isometric - Hexoctahedral H-M Symbol (4/m -3 2/m) Space Group: Fd3m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.95(1) 1.827(0.8) 6(0.8) |
Physical Properties |
|
| Cleavage: |
[111] Imperfect, [111] Imperfect, [111] Imperfect |
| Color: |
white, yellow, or yellowish brown. |
| Density: |
4.7 - 5.4, Average = 5.05 |
| Diaphaniety: |
Transparent to Subopaque |
| Habits: |
Encrustations - Forms crust-like aggregates on matrix., Pulverulent - Forms a loose, poorly-coherent powdery mass., |
| Hardness: |
5.5-6 - Knife Blade-Orthoclase |
| Luster: |
Vitreous - Greasy |
| Streak: |
brownish yellow |
Optical Properties |
|
| Optical Data: |
Isotropic, n=1.83-1.87. |
Other Information |
|
| References: |
NAME( Duda&Rejl90;) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) |
| See Also: |
Links to other databases for Romeite : 1 -Athena Mineralogy 2 - Crocoite.com Mineral Locations 3 - EUROmin Project 4 - Franklin Minerals(Dunn) 5 -MinDat.org Location Data 6 -MinMax 7 -WWW-MINCRYST 8 -École des Mines de Paris Search for Romeite using: Visit our Advertisers for Romeite : Ask about Romeite here : |
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