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Roumaite

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Formula:
(Ca,Na,REE,◻)7(Nb,Ti)[Si2O7]2OF3
System:
Monoclinic

Classification of Roumaite

Approved 2008
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http://www.mindat.org/min-38702.html
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First Recorded Occurrence of Roumaite

Crystallography of Roumaite

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bb
Cell Parameters:
a = 7.473Å, b = 11.294Å, c = 18.778Å
β = 101.60°
Ratio:
a:b:c = 0.662 : 1 : 1.663
Unit Cell Volume:
V 1,552.49 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.057 (100)
2.790 (40)
2.689 (46)
2.567 (44)
2.021 (68)
2.004 (33)
1.813 (33)
1.680 (60)

Chemical Properties of Roumaite

Formula:
(Ca,Na,REE,◻)7(Nb,Ti)[Si2O7]2OF3
Essential elements:
All elements listed in formula:

Relationship of Roumaite to other Species

Structurally related to group(s):

Other Names for Roumaite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Roumaite

Reference List:
Biagioni, C., Bonaccorsi, E., Merlino, S., Parodi, G.C., Perchiazzi, N., Chevrier, V. & Bersani, D. (2010). Roumaite, (Ca,Na,)3(Ca,REE,Na)4(Nb,Ti)[Si2O7]2(OH)F3, from Rouma Island, Los Archipelago, Guinea: a new mineral species related to dovyrenite. Canadian Mineralogist, 48, 17-28.

Internet Links for Roumaite

Localities for Roumaite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Guinea
 
  • Los Archipelago (Los Islands)
Biagioni, C., Bonaccorsi, E., Merlino, S., Parodi, G.C., Perchiazzi, N., Chevrier, V. & Bersani, D. (2010). Roumaite, (Ca,Na,)3(Ca,REE,Na)4(Nb,Ti)[Si2O7]2(OH)F3, from Rouma Island, Los Archipelago, Guinea: a new mineral species related to dovyrenite. Canadian Mineralogist, 48, 17-28.
Mineral and/or Locality  
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