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Mcgillite

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About McgilliteHide

McGill University Coat of Arms
Formula:
(Mn,Fe)8Si6O15(OH)8Cl2
Hardness:
5
Crystal System:
Monoclinic
Name:
For McGill University, Montreal, Quebec, Canada.
Isostructural with:
Chemically very similar to pyrosmalite-(Mn).


Classification of McgilliteHide

Approved
Approval Year:
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)

Physical Properties of McgilliteHide

Hardness:

Optical Data of McgilliteHide

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 McgilliteHide

Formula:
(Mn,Fe)8Si6O15(OH)8Cl2
IMA Formula:
Mn2+8Si6O15(OH)8Cl2
Common Impurities:
As,Zn,Mg,Ca,H2O

Crystallography of McgilliteHide

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

Type Occurrence of McgilliteHide

Synonyms of McgilliteHide

Other Language Names for McgilliteHide

German:McGillit
Spanish:McGillita

Relationship of Mcgillite to other SpeciesHide

Other Members of this group:
FriedeliteMn2+8Si6O15(OH,Cl)10Mon. 2/m : B2/m
Nelenite(Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3]Mon.
Pyrosmalite-(Fe)Fe2+8Si6O15(OH,Cl)10Trig. 3m (3 2/m) : P3m1
Pyrosmalite-(Mn)Mn2+8Si6O15(OH,Cl)10Trig.
SchalleriteMn2+16As3Si12O36(OH)17Trig. 3m : P3m1

Common AssociatesHide

Associated Minerals Based on Photo Data:
Sphalerite5 photos of Mcgillite associated with Sphalerite on mindat.org.
Boulangerite3 photos of Mcgillite associated with Boulangerite on mindat.org.
Calcite3 photos of Mcgillite associated with Calcite on mindat.org.
Pyrite3 photos of Mcgillite associated with Pyrite on mindat.org.
Quartz3 photos of Mcgillite associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.EE.05BementiteMn7Si6O15(OH)8Mon.
9.EE.10BrokenhilliteMn8Si6O15(OH)10Hex. 6mm : P63mc
9.EE.10Pyrosmalite-(Fe)Fe2+8Si6O15(OH,Cl)10Trig. 3m (3 2/m) : P3m1
9.EE.10FriedeliteMn2+8Si6O15(OH,Cl)10Mon. 2/m : B2/m
9.EE.10Pyrosmalite-(Mn)Mn2+8Si6O15(OH,Cl)10Trig.
9.EE.15Nelenite(Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3]Mon.
9.EE.15SchalleriteMn2+16As3Si12O36(OH)17Trig. 3m : P3m1
9.EE.20Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2OMon. 2/m : B2/m
9.EE.20TuperssuatsiaiteNa2Fe3Si8O20(OH)2 · 4H2OMon. 2/m : B2/m
9.EE.20YofortieriteMn5Si8O20(OH)2 · 8-9H2OMon. 2/m : B2/m
9.EE.20WindhoekiteCa2Fe3+2.67[Si8O20](OH)4 · 10H2O Mon. 2/m : B2/m
9.EE.25Falcondoite(Ni,Mg)4Si6O15(OH)2 · 6H2OOrth.
9.EE.25LoughliniteNa2Mg3Si6O16 · 8H2OOrth.
9.EE.25SepioliteMg4(Si6O15)(OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna
9.EE.25Kalifersite(K,Na)5Fe3+7Si20O50(OH)6 · 12H2OTric.
9.EE.30GyroliteNaCa16Si23AlO60(OH)8 · 14H2OTric.
9.EE.30OrlymaniteCa4Mn3Si8O20(OH)6 · 2H2OHex.
9.EE.30TungusiteCa4Fe2Si6O15(OH)6
9.EE.35Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2OTrig.
9.EE.35Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2OTrig.
9.EE.40NatrosiliteNa2Si2O5Mon.
9.EE.45MakatiteNa2Si4O8(OH)2 · 4H2OMon. 2/m : P21/b
9.EE.50VarennesiteNa8Mn2Si10O25(OH,Cl)2 · 12H2OOrth.
9.EE.55RaiteNa4Mn2+3Ti0.25Si8O20(OH)2 · 10H2OOrth. 2 2 2 : C2 2 2
9.EE.60IntersiliteNa6Mn2+Ti[Si10O24(OH)](OH)3 · 4H2OMon.
9.EE.65Shafranovskite(Na,K)6(Mn,Fe)3Si9O24 · 6H2OTrig.
9.EE.65ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2OTrig.
9.EE.70ZeophylliteCa13Si10O28(OH)2F8 · 6H2OTrig. 3 : R3
9.EE.75Minehillite(K,Na)2-3Ca28Zn4Al4Si40O112(OH)16Hex.
9.EE.80Fedorite(Na,K)2-3(Ca4Na3)Si16O38(OH,F)2 · 3.5H2OTric. 1 : P1
9.EE.80Martinite(Na,◻,Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2·4H2OTric. 1 : P1
9.EE.85Lalondeite(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2·3H2OTric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

72.4.1b.1FriedeliteMn2+8Si6O15(OH,Cl)10Mon. 2/m : B2/m
72.4.1b.3Nelenite(Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3]Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.3.1RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2Mon.
17.3.2ZunyiteAl13Si5O20(OH,F)18ClIso. 4 3m : F4 3m
17.3.3SodaliteNa8(Al6Si6O24)Cl2Iso. 4 3m : P4 3n
17.3.4MarialiteNa4Al3Si9O24ClTet. 4/m : I4/m
17.3.5TugtupiteNa4BeAlSi4O12ClTet. 4 : I4
17.3.6EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m (3 2/m) : R3m
17.3.7AlluaiviteNa19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2OTrig. 3m (3 2/m) : R3m
17.3.8NasonitePb6Ca4(Si2O7)3Cl2Hex.
17.3.9AsisitePb7SiO9Cl2 Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
17.3.10JagoitePb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6Hex.
17.3.11FriedeliteMn2+8Si6O15(OH,Cl)10Mon. 2/m : B2/m
17.3.12Pyrosmalite-(Fe)Fe2+8Si6O15(OH,Cl)10Trig. 3m (3 2/m) : P3m1
17.3.13Pyrosmalite
17.3.14Pyrosmalite-(Mn)Mn2+8Si6O15(OH,Cl)10Trig.
17.3.17TraskiteBa21Ca(Fe2+,Mn,Ti)4(Ti,Fe,Mg)12(Si12O36)(Si2O7)6(O,OH)30Cl6·14H2O Hex.
17.3.18MuiriteBa10Ca2Mn2+Ti[(OH,Cl,F)|HSi2O7]5Tet. 4/mmm (4/m 2/m 2/m) : P4/mmm
17.3.19VerplanckiteBa2(Mn,Fe,Ti)Si2O6(O,OH,Cl,F)2 · 3H2O or nearHex.

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 McgilliteHide

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

Localities for McgilliteHide

ⓘ - 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)
 
  • 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)
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