Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
Na6Sr12Ba2Zr13Si39B4O123(OH)6 ·20H2O
Colourless to grey
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

Approval Year:
2003 URL:
Please feel free to link to this page.

Type Occurrence of Rogermitchellite

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

Physical Properties of Rogermitchellite

Diaphaneity (Transparency):
Colourless to grey

Crystallography of Rogermitchellite

Crystal System:
Class (H-M):
6mm - Dihexagonal Pyramidal
Space Group:
Cell Parameters:
a = 26.509Å, c = 9.975Å
a:c = 1 : 0.376
Unit Cell Volume:
V 6,070.58 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
From type description.

Optical Data of Rogermitchellite

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:

Chemical Properties of Rogermitchellite

Na6Sr12Ba2Zr13Si39B4O123(OH)6 ·20H2O
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 (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 is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2016, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 27, 2016 15:53:01 Page generated: August 25, 2016 20:32:02
Go to top of page