Mindat Logo
Home Page Log In Messageboard The Mindat Directory
Register Search Pages Mineral Chatroom The Mindat Store

Roumaite

This page is currently not sponsored. Click here to sponsor this page.



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


Rinkite Group.

Classification of Roumaite

IMA status:Approved 2008
mindat.org URL:http://www.mindat.org/min-38702.html
Please feel free to link to this page.

Type Occurrence of Roumaite

Type Locality:Rouma Island (Roume; Roma; Ruma), 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
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

Search Engines:
  • Look for Roumaite on Google
  • Look for Roumaite images on Google
    • External Links:
  • Look for Roumaite on Webmineral
  • Look for Roumaite on Athena Mineralogy
  • Look for Roumaite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
    • Mineral Dealers:
  • Buy minerals from YourMineralCollection
  • Buy fine minerals and gemstones from Pala International
  • Roumaite specimens for sale - minfind.com
  • High-end worldwide specimens & outstanding customer service
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • The Arkenstone - Fine Minerals
  • Fine and rare minerals from mintreasure.com
  • Buy RARE Minerals from Rocks of Africa
  • webminerals
  • Search for - Roumaite - on e-Rocks Mineral Sales & Auctions
  • Search for Roumaite on Well-Arranged Molecules
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
    • Jobs:
  • Mining & Geology Jobs

    • 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.
    Hide Locality List
    (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.
    Mineral and/or Locality
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: 14th Dec 2012 20:54:17
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds