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Rogermitchellite

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Formula:
Na6Sr12Ba2Zr13Si39B4O123(OH)6 ·20H2O
Colour:
Colourless to grey
Lustre:
Vitreous
Crystal System:
Hexagonal
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.


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Classification of RogermitchelliteHide

Approved
Approval Year:
2003

Physical Properties of RogermitchelliteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless to grey

Optical Data of RogermitchelliteHide

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 RogermitchelliteHide

Formula:
Na6Sr12Ba2Zr13Si39B4O123(OH)6 ·20H2O
IMA Formula:
Na6(Sr,Na)12Ba2Zr13Si39(B,Si)6O123(OH)12 · 9H2O

Crystallography of RogermitchelliteHide

Crystal System:
Hexagonal
Class (H-M):
6mm - Dihexagonal Pyramidal
Space Group:
P63cm
Cell Parameters:
a = 26.509 Å, c = 9.975 Å
Ratio:
a:c = 1 : 0.376
Unit Cell V:
6,070.58 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

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.

Type Occurrence of RogermitchelliteHide

Synonyms of RogermitchelliteHide

Other Language Names for RogermitchelliteHide

Other InformationHide

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 RogermitchelliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 RogermitchelliteHide

Localities for RogermitchelliteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada (TL)
 
  • 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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