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.

Type Locality:

ⓘ Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Related to benitoite.

Hide all sections | Show all sections

Unique IdentifiersHide

Mindat ID:

27514

Long-form identifier:

mindat:1:1:27514:1

GUID
(UUID V4):

26e19309-ff1c-4fe3-9019-f89dda6651c6

IMA Classification of RogermitchelliteHide

IMA status:

Approved

IMA Formula:

Na₆Sr₁₂Ba₂Zr₁₃Si₃₉B₆O₁₂₃(OH)₁₄ · 10H₂O

Approval year:

2003

First published:

2010

Classification of RogermitchelliteHide

Strunz-mindat (2024):

9.CA.35

9 : SILICATES (Germanates)
C : Cyclosilicates
A : [Si₃O₉]₆- 3-membered single rings (dreier-Einfachringe), without insular complex anions

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Symbol	Source	Reference
Rmt	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
	Whitney & Evans (2010)	Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371

Physical Properties of RogermitchelliteHide

Lustre:

Vitreous

Transparency:

Transparent

Colour:

Colourless to grey

Streak:

White

Hardness:

5 on Mohs scale

Tenacity:

Very brittle

Cleavage:

None Observed

Fracture:

Splintery, Conchoidal

Density:

3.34(1) g/cm³ (Calculated)

Comment:

Calculated value based on the empirical formula.

Optical Data of RogermitchelliteHide

Type:

Uniaxial (+)

RI values:

n_ω = 1.640 n_ε = 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

Chemistry of RogermitchelliteHide

Mindat Formula:

Na₆Sr₁₂Ba₂Zr₁₃Si₃₉B₄O₁₂₃(OH)₆ · 20H₂O

Elements listed:

B, Ba, H, Na, O, Si, Sr, Zr - search for minerals with similar chemistry

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 Å³ (Calculated from Unit Cell)

Morphology:

Type material:
Prismatic along [001], and slightly flattened perpendicular to this direction. Prominent forms include the prism {100} and pinacoid {001}, with a minor, very shallow ditrigonal scalenohedron {10l}.

Crystal StructureHide

Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4

View
CIF File Best | x | y | z | a | b | c

Rotation
Stop | Start

Labels
Console Off | On | Grey | Yellow

Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0006329	Rogermitchellite	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, Quebec: Description, structure determination and relationship with HFSE-bearing cyclosilicates The Canadian Mineralogist 48 267-278		2010	Mont Saint-Hilaire, Quebec, Canada	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Rogermitchellite'
loop_
_publ_author_name
'McDonald A M'
'Chao G Y'
_journal_name_full 'The Canadian Mineralogist'
_journal_volume 48 
_journal_year 2010
_journal_page_first 267
_journal_page_last 278
_publ_section_title
;
 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
;
_database_code_amcsd 0006329
_chemical_compound_source 'Mont Saint-Hilaire, Quebec, Canada'
_chemical_formula_sum 'Na7.2 Sr10.8 Ba2 Zr13 Si40.5 B4.5 O144.72 H31.44'
_cell_length_a 26.509
_cell_length_b 26.509
_cell_length_c 9.975
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 6070.581
_exptl_crystal_density_diffrn      3.340
_symmetry_space_group_name_H-M 'P -3 c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-y,-x,1/2+z'
  'y,-x+y,-z'
  '-x,-x+y,1/2-z'
  '-x+y,-x,z'
  '-x+y,y,1/2+z'
  '-x,-y,-z'
  'y,x,1/2-z'
  '-y,x-y,z'
  'x,x-y,1/2+z'
  'x-y,x,-z'
  'x-y,-y,1/2-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Na1   0.91840   0.83700   0.49900   1.00000   0.05900
Sr1   0.67649   0.58170   0.50050   0.91000   0.01700
Na1   0.67649   0.58170   0.50050   0.09000   0.01700
Sr2   0.90510   0.58160   0.49970   0.89000   0.01600
Na2   0.90510   0.58160   0.49970   0.11000   0.01600
Ba   0.66667   0.33333   0.50000   1.00000   0.01960
Zr1   0.83860   0.41930   0.50000   1.00000   0.01050
Zr2   0.83890   0.67753   0.49990   1.00000   0.01090
Zr3   0.00000   0.00000   0.50000   1.00000   0.00730
Si1   0.93550   0.67690   0.25010   1.00000   0.01000
Si2   0.68020   0.44700   0.25010   1.00000   0.00700
Si3   0.80860   0.48920   0.24980   1.00000   0.00900
Si4   0.93540   0.41920   0.25000   1.00000   0.01100
Si5   0.76700   0.57640   0.25020   1.00000   0.01000
Si6   0.93410   0.77160   0.74960   1.00000   0.01400
Si7   0.00000   0.90420   0.75000   1.00000   0.01000
B1   0.00000   0.61480   0.25000   0.78000   0.07000
Si1   0.00000   0.61480   0.25000   0.22000   0.07000
B2   0.00000   0.64430   0.75000   0.72000   0.05000
Si2   0.00000   0.64430   0.75000   0.28000   0.05000
O1   0.77270   0.35610   0.38400   1.00000   0.01000
O2   0.90250   0.41560   0.38700   1.00000   0.01400
O3   0.70300   0.51830   0.25000   1.00000   0.01300
O4   0.77230   0.61200   0.38400   1.00000   0.01900
O5   0.00000   0.52220   0.75000   1.00000   0.00900
O6   0.84030   0.61240   0.61700   1.00000   0.01600
O7   0.90100   0.67290   0.38600   1.00000   0.01200
O8   0.94680   0.58270   0.75100   1.00000   0.01400
O9   0.83990   0.48390   0.11900   1.00000   0.01100
O10   0.73840   0.44090   0.25100   1.00000   0.01000
O11   0.84030   0.48420   0.38000   1.00000   0.01400
O12   0.99970   0.93530   0.61600   1.00000   0.02000
O13   0.81490   0.55370   0.24900   1.00000   0.01100
O14   0.64340   0.41620   0.11700   1.00000   0.01100
O15   0.90260   0.48740   0.61200   1.00000   0.01500
O16   0.00000   0.73590   0.25000   1.00000   0.01400
O17   0.94580   0.62040   0.25000   1.00000   0.01200
O18   0.00000   0.77980   0.75000   1.00000   0.01700
O19   0.90070   0.67270   0.11400   1.00000   0.01000
O20   0.90160   0.74110   0.61500   1.00000   0.02100
O21   0.94260   0.83800   0.75100   1.00000   0.02200
O22   0.83920   0.74100   0.38400   1.00000   0.02000
O-H23   0.99950   0.58480   0.37700   1.00000   0.02800
O-H24   0.00000   0.67280   0.61700   1.00000   0.02900
Wat25   0.99990   0.83320   0.41100   1.00000   0.06700
Wat26   0.00000   0.50000   0.50000   0.40000   0.10000
Wat27   0.99900   0.75800   0.96100   0.42000   0.10000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Na1 0.04600 0.04800 0.08800 0.02600 -0.01600 -0.01600
Sr1 0.01400 0.01700 0.01700 0.00600 0.00000 -0.00200
Na1 0.01400 0.01700 0.01700 0.00600 0.00000 -0.00200
Sr2 0.01500 0.01500 0.01800 0.00800 0.00300 0.00300
Na2 0.01500 0.01500 0.01800 0.00800 0.00300 0.00300
Ba 0.01580 0.01580 0.02700 0.00790 0.00000 0.00000
Zr1 0.00880 0.01300 0.00870 0.00500 0.00050 0.00000
Zr2 0.01200 0.01200 0.00870 0.00600 0.00200 0.00010
Zr3 0.01000 0.01000 0.00100 0.00520 0.00000 0.00000
Si1 0.00600 0.00400 0.01600 -0.00100 0.00000 0.00000
Si2 0.00900 0.00200 0.01100 0.00500 0.00000 0.00000
Si3 0.00900 0.00800 0.01000 0.00500 0.00000 0.00000
Si4 0.01000 0.01400 0.01000 0.00600 0.00100 -0.00100
Si5 0.00800 0.00900 0.01200 0.00400 -0.00100 0.00100
Si6 0.01600 0.01300 0.01400 0.00600 -0.00100 -0.00300
Si7 0.01100 0.01400 0.00400 0.00500 -0.00100 0.00000
B1 0.03000 0.15000 0.07000 0.08000 0.02000 0.08000
Si1 0.03000 0.15000 0.07000 0.08000 0.02000 0.08000
B2 0.02000 0.02000 0.07000 0.00000 -0.11000 0.07000
Si2 0.02000 0.02000 0.07000 0.00000 -0.11000 0.07000
O1 0.02200 0.00800 0.00000 0.00800 -0.01100 -0.00900
O2 0.01400 0.01500 0.00700 0.00400 0.00600 0.00200
O3 0.00200 0.00000 0.02200 -0.01000 0.00400 0.00200
O4 0.01200 0.00500 0.03100 -0.00200 -0.00100 -0.00900
O5 0.01300 0.01000 0.00600 0.00600 -0.00200 -0.00100
O6 0.01500 0.00400 0.02500 0.00300 0.00900 0.00300
O7 0.01600 0.00600 0.01600 0.00800 0.00700 0.00000
O8 0.01800 0.00700 0.02200 0.01000 0.00100 0.00200
O9 0.02100 0.00600 0.00900 0.00800 0.00500 0.00000
O11 0.01700 0.01200 0.01200 0.00600 -0.00100 -0.00200
O12 0.02300 0.02200 0.01400 0.01000 0.00300 0.00600
O13 0.01100 0.00300 0.02300 0.00600 0.00100 -0.00300
O14 0.01000 0.01000 0.00900 0.00100 -0.00900 0.00100
O15 0.01900 0.02200 0.00500 0.01100 0.00000 -0.00300
O17 0.01200 0.01300 0.01500 0.00800 0.00100 0.00300
O18 0.01300 0.01000 0.03000 0.00600 0.00300 0.00100
O19 0.01400 0.00600 0.01200 0.00600 -0.00900 0.00500
O20 0.01900 0.02800 0.01700 0.01200 -0.01400 -0.01800
O22 0.02400 0.02800 0.01300 0.01600 0.00300 0.01700
O-H23 0.04200 0.02000 0.02000 0.01900 -0.00300 0.01600
O-H24 0.00300 0.04000 0.03000 0.00100 0.00300 0.00200
Wat25 0.08000 0.06000 0.07000 0.04000 -0.01000 -0.01000

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
5.76 Å	(40)
3.924 Å	(30)
3.761 Å	(90)
3.310 Å	(25)
3.150 Å	(50)
2.760 Å	(100)
1.991 Å	(70)

Comments:

From type description.

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 4b: Highly evolved igneous rocks	>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of RogermitchelliteHide

Type Locality:

ⓘ Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

General Appearance of Type Material:

Free-standing crystals in vugs. Isolated, single crystals are prismatic slightly flattened perpendicular to the elongation, with a maximum dimension of 0.1 x 3 x 0.25 mm.

Place of Conservation of Type Material:

Canadian Museum of Nature, Ottawa, Ontario, Canada, CMNMC 860087.

Geological Setting of Type Material:

A late-stage igneous breccia in nepheline syenite.

Associated Minerals at Type Locality:

Zircon	Sodalite	Pyrrhotite	Microcline	Manganoneptunite
Labuntsovite Supergroup	Galena	Annite	Aegirine

Synonyms of RogermitchelliteHide

IMA2003-019

Unnamed (MSH UK-99)

Related Minerals - Strunz-mindat Grouping Hide

9.CA.	UM1975-18-SiO:Mn	α-MnSiO₃	Tric.
9.CA.05	Bazirite	BaZr(Si₃O₉)	Hex. 6 m2 : P6c2
9.CA.05	Benitoite	BaTi(Si₃O₉)	Hex. 6 m2 : P6₂c
9.CA.05	Pabstite	Ba(Sn,Ti)(Si₃O₉)	Hex. 6 m2 : P6c2
9.CA.10	Wadeite	K₂Zr(Si₃O₉)	Hex. 6/m : P6₃/m
9.CA.15	Calciocatapleiite	CaZr(Si₃O₉) · 2H₂O	Orth. mmm (2/m 2/m 2/m)
9.CA.15	Catapleiite	Na₂Zr(Si₃O₉) · 2H₂O	Mon.
9.CA.20	Pseudowollastonite	CaSiO₃	Mon. 2/m : B2/b
9.CA.25	Margarosanite	Pb(Ca,Mn²⁺)₂(Si₃O₉)	Tric. 1 : P1
9.CA.25	Walstromite	BaCa₂(Si₃O₉)	Tric. 1 : P1
9.CA.25	Breyite	Ca₃Si₃O₉	Tric. 1 : P1
9.CA.30	Bobtraillite	(Na,◻)₁₂(◻,Na)₁₂Sr₁₂Zr₁₄(Si₃O₉)₁₀[Si₂BO₇(OH)₂]₆ · 12H₂O	Trig. 3m (3 2/m) : P3 1c

Fluorescence of RogermitchelliteHide

In UV light:

Not fluorescent.

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.

Internet Links for RogermitchelliteHide

mindat.org URL:

https://www.mindat.org/min-27514.html
Please feel free to link to this page.

Search Engines:

Look for Rogermitchellite on Google

Look for Rogermitchellite images on Google

Look for Rogermitchellite on Bing

Look for Rogermitchellite images on Bing

Look for Rogermitchellite on DuckDuckGo

Look for Rogermitchellite images on DuckDuckGo

Look for Rogermitchellite in the Rock H. Currier Digital Library

External Links:

Look for Rogermitchellite on Webmineral

Look for Rogermitchellite on Wikipedia

Look for Rogermitchellite on Mineralien Atlas

Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

The Arkenstone - Fine Minerals

Buy from McDougall Minerals

Blue Gems Australian & International

Buy rare minerals from Excalibur Minerals

High-end worldwide specimens & outstanding customer service

Buy from David K Joyce minerals

Wilensky Exquisite Minerals

Fine Minerals from Weinrich Minerals, Inc.

References for RogermitchelliteHide

Reference List:

McDonald, Andrew M., Chao, George 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. The Canadian Mineralogist, 48 (2) 267-278 doi:10.3749/canmin.48.2.267

(2023) Rogermitchellite. Handbook of Mineralogy. Mineralogical Society of America

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 references and 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 (e.g. 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

ⓘ Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH) (TL)

McDonald et al. (2010)

Rogermitchellite