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Mcgillite

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McGill University Coat of Arms
Formula:
(Mn,Fe)8Si6O15(OH)8Cl2
System:
Monoclinic
Hardness:
5
Name:
For McGill University, Montreal, Quebec, Canada.
Isostructural with:
This page provides mineralogical data about Mcgillite.

Classification of Mcgillite

Approved 1979
9.EE.10

9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands
72.4.1b.2

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
4 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-, 6-, and 12-membered rings
17.3.16

17 : Silicates Containing other Anions
3 : Silicates with chloride (including aluminosilicates)
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Type Occurrence of Mcgillite

Year of Discovery:
1979

Physical Properties of Mcgillite

Hardness (Mohs):
5

Crystallography of Mcgillite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Space Group Setting:
C1 2/m 1
Cell Parameters:
a = 23.31Å, b = 13.45Å, c = 7.42Å
β = 105.17°
Ratio:
a:b:c = 1.733 : 1 : 0.552
Unit Cell Volume:
V 2,245.25 ų (Calculated from Unit Cell)
Twinning:
Universal, repeated about monoclinic [110] and [1-10], composition plane {001}, giving pseudorhombohedral symmetry.

Optical Data of Mcgillite

Type:
Biaxial (-)
RI values:
nα = 1.640 - 1.643 nβ = 1.667 - 1.670 nγ = 1.667 - 1.670
Max Birefringence:
δ = 0.027
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively weak

Chemical Properties of Mcgillite

Formula:
(Mn,Fe)8Si6O15(OH)8Cl2
Essential elements:
All elements listed in formula:
Common Impurities:
As,Zn,Mg,Ca,H2O

Relationship of Mcgillite to other Species

Other Members of Group:
Friedelite(Mn,Fe)8Si6O15(OH,Cl)10
Nelenite(Mn,Fe)16(Si12O30)(OH)14[As33+O6(OH)3]
Pyrosmalite-(Fe)(Fe,Mn)8Si6O15(OH,Cl)10
Pyrosmalite-(Mn)(Mn,Fe)8Si6O15(OH,Cl)10
Schallerite(Mn,Fe)16Si12As3O36(OH)17
9.EE.05BementiteMn7Si6O15(OH)8
9.EE.10BrokenhilliteMn8Si6O15(OH)10
9.EE.10Pyrosmalite-(Fe)(Fe,Mn)8Si6O15(OH,Cl)10
9.EE.10Friedelite(Mn,Fe)8Si6O15(OH,Cl)10
9.EE.10Pyrosmalite-(Mn)(Mn,Fe)8Si6O15(OH,Cl)10
9.EE.15Nelenite(Mn,Fe)16(Si12O30)(OH)14[As33+O6(OH)3]
9.EE.15Schallerite(Mn,Fe)16Si12As3O36(OH)17
9.EE.20Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2O
9.EE.20TuperssuatsiaiteNa2Fe3Si8O20(OH)2 · 4H2O
9.EE.20YofortieriteMn5Si8O20(OH)2 · 8-9H2O
9.EE.20WindhoekiteCa2Fe3+2.67[Si8O20](OH)4 · 10H2O
9.EE.25Falcondoite(Ni,Mg)4Si6O15(OH)2 · 6H2O
9.EE.25LoughliniteNa2Mg3Si6O16 · 8H2O
9.EE.25SepioliteMg4(Si6O15)(OH)2 · 6H2O
9.EE.25Kalifersite(K,Na)5Fe73+Si20O50(OH)6 · 12H2O
9.EE.30GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
9.EE.30OrlymaniteCa4Mn3Si8O20(OH)6 · 2H2O
9.EE.30TungusiteCa4Fe2Si6O15(OH)6
9.EE.35Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2O
9.EE.35Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2O
9.EE.40NatrosiliteNa2Si2O5
9.EE.45MakatiteNa2Si4O8(OH)2 · 4H2O
9.EE.50VarennesiteNa8Mn2Si10O25(OH,Cl)2 · 12H2O
9.EE.55RaiteNa4Mn32+Ti0.25Si8O20(OH)2 · 10H2O
9.EE.60IntersiliteNa6Mn2+Ti[Si10O24(OH)](OH)3 · 4H2O
9.EE.65Shafranovskite(Na,K)6(Mn,Fe)3Si9O24 · 6H2O
9.EE.65ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2O
9.EE.70ZeophylliteCa13(Si10O28)F10 · 6H2O
9.EE.75Minehillite(K,Na)2-3Ca28Zn4Al4Si40O112(OH)16
9.EE.80Fedorite(Na,K)2-3(Ca4Na3)Si16O38(OH,F)2 · 3.5H2O
9.EE.80Martinite(Na,◻,Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2·4H2O
9.EE.85Lalondeite(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2·3H2O
17.3.1RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2
17.3.2ZunyiteAl13Si5O20(OH,F)18Cl
17.3.3SodaliteNa8(Al6Si6O24)Cl2
17.3.4MarialiteNa4Al3Si9O24Cl
17.3.5TugtupiteNa4(AlBeSi4O12)Cl
17.3.6EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
17.3.7AlluaiviteNa19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2O
17.3.8NasonitePb6Ca4(Si2O7)3Cl2
17.3.9AsisitePb7SiO9Cl2
17.3.10JagoitePb18Fe43+[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6
17.3.11Friedelite(Mn,Fe)8Si6O15(OH,Cl)10
17.3.12Pyrosmalite-(Fe)(Fe,Mn)8Si6O15(OH,Cl)10
17.3.13Pyrosmalite
17.3.14Pyrosmalite-(Mn)(Mn,Fe)8Si6O15(OH,Cl)10
17.3.17TraskiteBa21Ca(Fe2+,Mn,Ti)4(Ti,Fe,Mg)12(Si12O36)(Si2O7)6(O,OH)30Cl6·14H2O
17.3.18MuiriteBa10Ca2Mn2+Ti[(OH,Cl,F)|HSi2O7]5
17.3.19VerplanckiteBa2(Mn,Fe,Ti)Si2O6(O,OH,Cl,F)2 · 3H2O or near

Other Names for Mcgillite

Name in Other Languages:
German:McGillit
Spanish:McGillita

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 Mcgillite

Reference List:
Donnay, G., M. Bétournay, and G. Hamill (1980): McGillite, a new manganous hydroxychlorosilicate. Canadian Mineralogist 18, 31-36. Abstract: American Mineralogist (1981): 66: 1276.
Acta Crystallographica (1982): A38: 685.
Ozawa, T., Y. Takéuchi, T. Takahata, G. Donnay, and J.D.H. Donnay (1983): The pyrosmalite group of minerals. II. The layer structure of mcgillite and friedelite. Canadian Mineralogist, 21, 7-17.
John S. Stevenson, Louise S. Stevenson, and J. D. H. Donnay (1984): A postscript to the mcgillite story. Can. Mineral. 22, 265-268.

Internet Links for Mcgillite

Localities for Mcgillite

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)
 
  • British Columbia
    • Fort Steele Mining Division
      • Kimberley
DONNAY, G., BÉTOURNAY, M. & HAMILL, G. (1980): Mcgillite, a new manganous hydroxychlorosilicate. Canadian Mineralogist 18, 31-36. OZAWA, T., TAKÉUCHI, Y., TAKAHATA, T., DONNAY, G. & DONNAY, J.D.H. (1983): The pyrosmalite group of minerals. II. The layer structure of mcgillite and friedelite. Canadian Mineralogist 21, 7-17.
Romania
 
  • Suceava Co.
    • Suceava district
      • Iacobeni (Jakobeny; Jacobeny; Jakabfalva)
http://minerals-of-the-carpathians.eu
Mineral and/or Locality  
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