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Roumaite

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Formula:
(Ca,Na,REE,◻)
 
7
(Nb,Ti)[Si
 
2
O
 
7
]
 
2
OF
 
3
System:Monoclinic

Classification of Roumaite

IMA status:Approved 2008
mindat.org URL:http://www.mindat.org/min-38702.html
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Type Occurrence of Roumaite

Type Locality:Rouma Island (Roume Island; Roma Island; Ruma Island), Los Archipelago (Los Islands), Guinea

Crystallography of Roumaite

Crystal System:Monoclinic
Class (H-M):m - Domatic
Space Group:Bb {B1 1b} {Cc} {C1c1}
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:
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)[Si
 
2
O
 
7
]
 
2
OF
 
3
Simplified for copy/paste:(Ca,Na,REE,[])7(Nb,Ti)[Si2O7]2OF3
Essential elements:Ca, F, Nb, O, Si
All elements listed in formula:Ca, F, Na, Nb, O, Si, Ti

Relationship of Roumaite to other Species

Structurally related to group(s):
Rinkite Group

Other Names for Roumaite

Synonyms:
IMA2008-024
Other Languages:

Other Information

Health Warning: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

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  • Localities for Roumaite

    The 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. ? 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.
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