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Mcgillite

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Formula:
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH)
 
8
Cl
 
2
System:MonoclinicHardness:5
Member of:Pyrosmalite Group
Name:
For McGill University, Montreal, Quebec, Canada.
Isostructural with:Pyrosmalite Group
This page provides mineralogical data about Mcgillite.

Classification of Mcgillite

IMA status:Approved 1979
Strunz 8th edition ID:8/H.28-80
Nickel-Strunz 10th (pending) edition ID:9.EE.10

9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands
Dana 8th edition ID: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
Hey's CIM Ref.:17.3.16

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

Type Locality:Sullivan Mine, Kimberley, Fort Steele Mining Division, British Columbia, Canada
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 {B1 1 2/m} {C2/m} {C1 2/m 1}
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
Maximum Birefringence:δ = 0.027

Chart 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)
 
8
Si
 
6
O
 
15
(OH)
 
8
Cl
 
2
Simplified for copy/paste:(Mn,Fe)8Si6O15(OH)8Cl2
Essential elements:Cl, H, Mn, O, Si
All elements listed in formula:Cl, Fe, H, Mn, O, Si
Common Impurities:As,Zn,Mg,Ca,H2O

Relationship of Mcgillite to other Species

Member of:Pyrosmalite Group
Other Members of Group:

- +
Friedelite
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
Nelenite
(Mn,Fe)
 
16
(Si
 
12
O
 
30
)(OH)
 
14
[As
3+
3
O
 
6
(OH)
 
3
]
Pyrosmalite-(Fe)
(Fe,Mn)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
Pyrosmalite-(Mn)
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
Schallerite
(Mn,Fe)
 
16
Si
 
12
As
 
3
O
 
36
(OH)
 
17
Related Minerals - Nickel-Strunz Grouping):

- +
9.EE.05Bementite
Mn
 
7
Si
 
6
O
 
15
(OH)
 
8
9.EE.10Brokenhillite
Mn
 
8
Si
 
6
O
 
15
(OH)
 
10
9.EE.10Pyrosmalite-(Fe)
(Fe,Mn)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
9.EE.10Friedelite
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
9.EE.10Pyrosmalite-(Mn)
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
9.EE.15Nelenite
(Mn,Fe)
 
16
(Si
 
12
O
 
30
)(OH)
 
14
[As
3+
3
O
 
6
(OH)
 
3
]
9.EE.15Schallerite
(Mn,Fe)
 
16
Si
 
12
As
 
3
O
 
36
(OH)
 
17
9.EE.20Palygorskite
(Mg,Al)
 
5
(Si,Al)
 
8
O
 
20
(OH)
 
2
· 8H
 
2
O
9.EE.20Tuperssuatsiaite
Na
 
2
Fe
 
3
Si
 
8
O
 
20
(OH)
 
2
· 4H
 
2
O
9.EE.20Yofortierite
Mn
 
5
Si
 
8
O
 
20
(OH)
 
2
· 8-9H
 
2
O
9.EE.20Windhoekite
Ca
 
2
Fe
3+
2.67
[Si
 
8
O
 
20
](OH)
 
4
· 10H
 
2
O
9.EE.25Falcondoite
(Ni,Mg)
 
4
Si
 
6
O
 
15
(OH)
 
2
· 6H
 
2
O
9.EE.25Loughlinite
Na
 
2
Mg
 
3
Si
 
6
O
 
16
· 8H
 
2
O
9.EE.25Sepiolite
Mg
 
4
(Si
 
6
O
 
15
)(OH)
 
2
· 6H
 
2
O
9.EE.25Kalifersite
(K,Na)
 
5
Fe
3+
7
Si
 
20
O
 
50
(OH)
 
6
· 12H
 
2
O
9.EE.30Gyrolite
NaCa
 
16
Si
 
23
AlO
 
60
(OH)
 
8
· 14H
 
2
O
9.EE.30Orlymanite
Ca
 
4
Mn
 
3
Si
 
8
O
 
20
(OH)
 
6
· 2H
 
2
O
9.EE.30Tungusite
Ca
 
4
Fe
 
2
Si
 
6
O
 
15
(OH)
 
6
9.EE.35Reyerite
(Na,K)
 
2
Ca
 
14
(Si,Al)
 
24
O
 
58
(OH)
 
8
· 6H
 
2
O
9.EE.35Truscottite
(Ca,Mn)
 
14
Si
 
24
O
 
58
(OH)
 
8
· 2H
 
2
O
9.EE.40Natrosilite
Na
 
2
Si
 
2
O
 
5
9.EE.45Makatite
Na
 
2
Si
 
4
O
 
8
(OH)
 
2
· 4H
 
2
O
9.EE.50Varennesite
Na
 
8
Mn
 
2
Si
 
10
O
 
25
(OH,Cl)
 
2
· 12H
 
2
O
9.EE.55Raite
Na
 
4
Mn
2+
3
Ti
 
0.25
Si
 
8
O
 
20
(OH)
 
2
· 10H
 
2
O
9.EE.60Intersilite
Na
 
6
Mn
2+
 
Ti[Si
 
10
O
 
24
(OH)](OH)
 
3
· 4H
 
2
O
9.EE.65Shafranovskite
(Na,K)
 
6
(Mn,Fe)
 
3
Si
 
9
O
 
24
· 6H
 
2
O
9.EE.65Zakharovite
Na
 
4
Mn
 
5
Si
 
10
O
 
24
(OH)
 
6
· 6H
 
2
O
9.EE.70Zeophyllite
Ca
 
13
(Si
 
10
O
 
28
)F
 
10
· 6H
 
2
O
9.EE.75Minehillite
(K,Na)
 
2-3
Ca
 
28
Zn
 
4
Al
 
4
Si
 
40
O
 
112
(OH)
 
16
9.EE.80Fedorite
(Na,K)
 
2-3
(Ca
 
4
Na
 
3
)Si
 
16
O
 
38
F
 
2
· 3.5H
 
2
O
9.EE.80Martinite
(Na,Ca)
 
11
Ca
 
4
(Si,S,B)
 
14
B
 
2
O
 
40
F
 
2
·4H
 
2
O
9.EE.85Lalondeite
(Na,Ca)
 
6
(Ca,Na)
 
3
Si
 
16
O
 
38
(F,OH)
 
2
·3H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
17.3.1Rustumite
Ca
 
10
(Si
 
2
O
 
7
)
 
2
(SiO
 
4
)(OH)
 
2
Cl
 
2
17.3.2Zunyite
Al
 
13
Si
 
5
O
 
20
(OH,F)
 
18
Cl
17.3.3Sodalite
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)Cl
 
2
17.3.4Marialite
Na
 
4
Al
 
3
Si
 
9
O
 
24
Cl
17.3.5Tugtupite
Na
 
4
(AlBeSi
 
4
O
 
12
)Cl
17.3.6Eudialyte
Na
 
15
Ca
 
6
(Fe
2+
 
,Mn
2+
 
)
 
3
Zr
 
3
[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
17.3.7Alluaivite
Na
 
19
(Ca,Mn)
 
6
(Ti,Nb)
 
3
Si
 
26
O
 
74
Cl · 2H
 
2
O
17.3.8Nasonite
Pb
 
6
Ca
 
4
(Si
 
2
O
 
7
)
 
3
Cl
 
2
17.3.9Asisite
Pb
 
7
SiO
 
9
Cl
 
2
17.3.10Jagoite
Pb
 
18
Fe
3+
4
[Si
 
4
(Si,Fe
3+
 
)
 
6
][Pb
 
4
Si
 
16
(Si,Fe)
 
4
]O
 
82
Cl
 
6
17.3.11Friedelite
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
17.3.12Pyrosmalite-(Fe)
(Fe,Mn)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
17.3.13Pyrosmalite
17.3.14Pyrosmalite-(Mn)
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
17.3.17Traskite
Ba
 
21
Ca(Fe
2+
 
,Mn,Ti)
 
4
(Ti,Fe,Mg)
 
12
(Si
 
12
O
 
36
)(Si
 
2
O
 
7
)
 
6
(O,OH)
 
30
Cl
 
6
·14H
 
2
O
17.3.18Muirite
Ba
 
10
Ca
 
2
Mn
2+
 
Ti[(OH,Cl,F)|HSi
 
2
O
 
7
]
 
5
17.3.19Verplanckite
Ba
 
2
(Mn,Fe,Ti)Si
 
2
O
 
6
(O,OH,Cl,F)
 
2
· 3H
 
2
O or near

Other Names for Mcgillite

Synonyms:
IMA1979-024
Other Languages:
German:McGillit
Spanish:McGillita

Other Information

Health Warning: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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • McGillite details from Handbook of Mineralogy (PDF)
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  • Localities for Mcgillite

    The 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. ? 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
     
    • 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
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