Mineralogy Database

Mcgillite Mineral Data

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General Mcgillite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Fe++)8Si6O15(OH)8Cl2
Help on Composition: Composition: Molecular Weight = 1,038.40 gm
   Magnesium   0.47 %  Mg    0.78 % MgO
   Manganese  37.03 %  Mn   47.82 % MnO
   Iron        3.23 %  Fe    4.15 % FeO
   Silicon    16.23 %  Si   34.72 % SiO2
   Hydrogen    0.78 %  H     6.94 % H2O
   Chlorine    6.83 %  Cl    6.83 % Cl
                -   %   Cl   -1.54 % -O=Cl2   
   Oxygen     35.44 %  O
             ______        ______ 
             100.00 %       99.69 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+7Fe2+0.6Mg0.2Si6O15(OH)8Cl2
Help on Environment: Environment: Open space fracture fillings in a manganese-rich section of quartzite and argillite in a metamorphosed Pb-Zn orebody.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: Locality: In the Sullivan mine, Kimberley, Kootenay district, British Columbia, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for McGill University, Montreal, Quebec, Canada.
Help on Name Pronunciation: Name Pronunciation: Mcgillite + Pronunciation Say MCGILLITE
Help on Synonym: Synonym: IMA1979-024

Mcgillite Image

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Comments: Pink crystalline mcgillite with galena.
Location: Near Kimberley, Kootenay District, British Columbia, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mcgillite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.732:1:0.5515
Help on Cell Dimensions: Cell Dimensions: a = 23.312, b = 13.459, c = 7.423, Z = 4; beta = 105.17° V = 2,247.85 Den(Calc)= 3.07
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.56(1), 7.16(0.7), 2.888(0.6),

Physical Properties of Mcgillite

Help on Cleavage: Cleavage: {0001} Good
Help on Color: Color: Light pink, Dark pink.
Help on Density: Density: 2.98
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Pearly
Help on Streak: Streak: reddish white

Optical Properties of Mcgillite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2148,KPDmeas= 0.2213,KC= 0.2209
Ncalc = 1.66 - 1.68
Help on Optical Data: Optical Data: Biaxial (-), a=1.64-1.643, b=1.667-1.67, g=1.667-1.67, bire=0.0270

Calculated Properties of Mcgillite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.89 gm/cc
note: Specific Gravity of Mcgillite =2.98 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0089020042
Boson Index = 0.9910979958
Help on Photoelectric: Photoelectric: PEMcgillite = 11.52 barns/electron
U=PEMcgillite x rElectron Density= 33.27 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mcgillite is Not Radioactive

Mcgillite Classification

Help on  Dana Class: Dana Class: 72.04.01b.02 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.04)with 4-, 6-, and 12-membered rings
  (72.04.01b)Pyrosmalite group (Friedelite subgroup)
72.04.01b.01 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m
72.04.01b.02 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m
72.04.01b.03 Nelenite (Mn,Fe)16Si12As3O36(OH)17 R 3m 3 2/m
Help on  Strunz Class: Strunz Class: 09.EE.10 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EE -Single tetrahedral nets of 6-membered rings
09.EE.10 Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 63mc 6mm
09.EE.10 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m
09.EE.10 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m
09.EE.10 Pyrosmalite-(Fe) (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m
09.EE.10 Pyrosmalite-(Mn) (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m

Other Mcgillite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Mcgillite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: 72.04.01b.02 Strunz No: 09.EE.10





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