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Rogermitchellite

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Formula:
Na
 
6
Sr
 
12
Ba
 
2
Zr
 
13
Si
 
39
B
 
4
O
 
123
(OH)
 
6
 ·20H
 
2
O
System:HexagonalColour:Colourless to grey
Name:Named after Dr. Roger Howard Mitchell (b. 1941), Professor Emeritus in the Departement of Geology at Lakehead University, Thunder Bay, Ontario, Canada in recognition of his outstanding contributions to the mineralogy and petrology of alkaline rocks.


Related to benitoite.

Classification of Rogermitchellite

IMA status:Approved 2003
mindat.org URL:http://www.mindat.org/min-27514.html
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Type Occurrence of Rogermitchellite

Type Locality:Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada
Geological Setting of type material:A late-stage igneous breccia in nepheline syenite
Associated Minerals at type locality:
ZirconSodalitePyrrhotiteMicroclineManganoneptunite
Labuntsovite GroupGalenaAnniteAegirine

Physical Properties of Rogermitchellite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colourless to grey

Crystallography of Rogermitchellite

Crystal System:Hexagonal
Class (H-M):6mm - Dihexagonal Pyramidal
Space Group:P63cm
Cell Parameters:a = 26.509Å, c = 9.975Å
Ratio:a:c = 1 : 0.376
Unit Cell Volume:V 6,070.58 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
5.76(40)
3.924(30)
3.761(90)
3.310(25)
3.150(50)
2.760(100)
1.991(70)
Comments:From type description.

Optical Data of Rogermitchellite

Type:Uniaxial (+)
RI values: nω = 1.640 nε = 1.663
Maximum Birefringence:δ = 0.023

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Rogermitchellite

Formula:
Na
 
6
Sr
 
12
Ba
 
2
Zr
 
13
Si
 
39
B
 
4
O
 
123
(OH)
 
6
 ·20H
 
2
O
Essential elements:B, Ba, H, Na, O, Si, Sr, Zr
All elements listed in formula:B, Ba, H, Na, O, Si, Sr, Zr

Other Names for Rogermitchellite

Synonyms:
IMA2003-019Unnamed (MSH UK-99)
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 Rogermitchellite

Reference List:

- +
McDonald, A.M. & Chao, G.Y. (2010): Rogermitchellite, Na12(Sr,Na)24Ba4Zr26Si78(B,Si)12O246(OH)24·18H2O, a new mineral species from Mont Saint-Hilaire, Québec: description, structure determination and relationship with HFSE-bearing cyclosilicates. Canadian Mineralogist, 48, 267-278.

Internet Links for Rogermitchellite

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  • Raman and XRD data at RRUFF project
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    • Localities for Rogermitchellite

    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.
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    (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.
    Canada
     
    • Québec
      • Montérégie
        • Rouville RCM
          • Mont Saint-Hilaire
    		McDONALD, A.M., and CHAO, G.Y. (2010): Rogermitchellite, Na12(Sr,Na)24Ba4Zr26Si78(B,Si)12O246(OH)24*18H2O, a new mineral species from Mont Saint-Hilaire, Quebec: Description, structure determination and relationship with HFSE-bearing cyclosilicates. Canadian Mineralogist. 48: 267-278
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. 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: 19th Jun 2011 16:09:31
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