Mcgillite Mineral Data + Say MCGILLITE

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 Synonym: Synonym: IMA1979-024
 

Mcgillite Image

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Mcgillite

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 - PrismaticH-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 Diaphaniety: Diaphaniety: 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
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:

relectron=2.89 gm/cc
note: rMcgillite =2.98 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.0089
Boson Index = 0.9911
Help on Photoelectric: Photoelectric:

PEMcgillite = 11.52 barns/electron
U=PEMcgillite x relectron= 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: 72.4.1b.2 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.4)with 4-, 6-, and 12-membered rings
  (72.4.1b)Pyrosmalite group (Friedelite subgroup)
 
72.4.1b.1 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m
 
72.4.1b.2 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m
 
72.4.1b.3 Nelenite (Mn,Fe)16Si12As3O36(OH)17 R 3m 3 2/m
Help on  Strunz Class: Strunz Class: VIII/H.28-80 VIII - Silicates
  VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others
  VIII/H.28 - Pyrosmalite series
 
VIII/H.28-10 Ferropyrosmalite (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m
 
VIII/H.28-20 Manganpyrosmalite (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m
 
VIII/H.28-30 Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 63mc 6mm
 
VIII/H.28-40 Nelenite (Mn,Fe)16Si12As3O36(OH)17 R 3m 3 2/m
 
VIII/H.28-50 Schallerite Mn16[AsO2OH][Si12O30](OH)14 P 3m1 ? 3m
 
VIII/H.28-70 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m
 
VIII/H.28-80 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m
 
VIII/H.28-90 Bementite Mn8Si6O15(OH)10 P 21/c 2/m
 
VIII/H.28-100 Varennesite Na8Mn2Si10O25(OH,Cl)2·12(H2O) C mcm 2/m 2/m 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Mcgillite

(Mn,Fe++)8Si6O15(OH)8Cl2
Dana No: 72.4.1b.2 Strunz No: VIII/H.28-80
Locality:

 

Notes:

 

 
   
 
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