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Rogermitchellite

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Formula:
Na6Sr12Ba2Zr13Si39B4O123(OH)6 ·20H2O
System:
Hexagonal
Colour:
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

Approved 2003
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First Recorded Occurrence of Rogermitchellite

Geological Setting of First Recorded Material:
A late-stage igneous breccia in nepheline syenite

Physical Properties of Rogermitchellite

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 Data:
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
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Rogermitchellite

Formula:
Na6Sr12Ba2Zr13Si39B4O123(OH)6 ·20H2O
Essential elements:
All elements listed in formula:

Other Names for Rogermitchellite

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 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

Localities for Rogermitchellite

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.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu 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
Mineral and/or Locality  
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