Ghost Lake cordierite occurrence, Yellowknife, Northwest Territories, Canadai
| Regional Level Types | |
|---|---|
| Ghost Lake cordierite occurrence | Occurrence |
| Yellowknife | - not defined - |
| Northwest Territories | Territory |
| Canada | Country |
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Latitude & Longitude (WGS84):
63° 45' 20'' North , 115° 1' 1'' West
Latitude & Longitude (decimal):
Locality type:
KΓΆppen climate type:
Lilac-blue cordierite in gneiss.
The Ghost Lake cordierite occurrence is located about 11 kilometres south of Ghost Lake, about 160 kilometres north of Yellowknife, Northwest Territories.
The occurrence was discovered by a Geological Survey of Canada party in 1939 (Lord, 1942). The earliest published reference to the occurrence was by Folinsbee (1940). It was described in more detail by Lord (1942) and again by Lord (1951). It is worth quoting Lord (1951) in detail:
βThe gneiss is composed of quartz, biotite, sillimanite, reddish almandite garnet, cordierite, microcline, andesine, tourmaline, spinel, and fine-grained graphite, in widely varying proportions . . . . Cordierite is abundant in places, but less so than garnet. It occurs as irregular masses and as prismatic crystals. The largest observed crystals are about 4 inches long and 2 inches wide. Much of it is thoroughly fractured, but a few fragments collected were sufficiently free of fractures to be cut into small gem-stones. Some of it is partly altered to a micaceous mineral, probably pinite.β
Heinrich (1950) mentions Folinsbeeβs report, and in addition has an explanation of βpiniteβ β an alteration product β. . . which consists chiefly of muscovite, chlorite, and biotite in varying proportions.β Photographs in his paper show clearly how the βpiniteβ replaces cordierite.
Further comment on the locality by Giles Peatfield:
The locality has historically been included in the βMackenzie Districtβ of the Northwest Territories. The various district names (i.e. Mackenzie, Franklin, Keewatin) were no longer used after the separation of the Territories into Northwest Territories and Nunavut in 1999. Even before that the βDistrict of Mackenzieβ, the more correct name, had ceased to function as an administrative entity.
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Standard Detailed Gallery Strunz Chemical ElementsMineral List
7 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| β Albite Formula: Na(AlSi3O8) Reference: personal correspondence with Giles Peatfield |
| β Albite var. Andesine Formula: (Na,Ca)[Al(Si,Al)Si2O8] Reference: personal correspondence with Giles Peatfield |
| β 'Amphibole Supergroup' Formula: AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 Reference: personal correspondence with Giles Peatfield |
| β 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 Reference: personal correspondence with Giles Peatfield |
| β 'Chlorite Group' Reference: personal correspondence with Giles Peatfield |
| β Cordierite Formula: (Mg,Fe)2Al3(AlSi5O18) Reference: Natural History Museum Vienna collection
personal correspondence with Giles Peatfield |
| β 'Garnet Group' Formula: X3Z2(SiO4)3 Reference: personal correspondence with Giles Peatfield |
| β Graphite Formula: C Reference: personal correspondence with Giles Peatfield |
| β Microcline Formula: K(AlSi3O8) Reference: personal correspondence with Giles Peatfield |
| β 'Pinite' Reference: personal correspondence with Giles Peatfield |
| β Quartz Formula: SiO2 Reference: personal correspondence with Giles Peatfield |
| β Sillimanite Formula: Al2(SiO4)O Reference: personal correspondence with Giles Peatfield |
| β Spinel Formula: MgAl2O4 Reference: personal correspondence with Giles Peatfield |
| β 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z Reference: personal correspondence with Giles Peatfield |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| β | Graphite | 1.CB.05a | C |
| Group 4 - Oxides and Hydroxides | |||
| β | Quartz | 4.DA.05 | SiO2 |
| β | Spinel | 4.BB.05 | MgAl2O4 |
| Group 9 - Silicates | |||
| β | Albite | 9.FA.35 | Na(AlSi3O8) |
| β | var. Andesine | 9.FA.35 | (Na,Ca)[Al(Si,Al)Si2O8] |
| β | Cordierite | 9.CJ.10 | (Mg,Fe)2Al3(AlSi5O18) |
| β | Microcline | 9.FA.30 | K(AlSi3O8) |
| β | Sillimanite | 9.AF.05 | Al2(SiO4)O |
| Unclassified Minerals, Rocks, etc. | |||
| β | 'Amphibole Supergroup' | - | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| β | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| β | 'Chlorite Group' | - | |
| β | 'Garnet Group' | - | X3Z2(SiO4)3 |
| β | 'Pinite' | - | |
| β | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | β Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| H | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| B | Boron | |
| B | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
| C | Carbon | |
| C | β Graphite | C |
| O | Oxygen | |
| O | β Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
| O | β Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| O | β Albite var. Andesine | (Na,Ca)[Al(Si,Al)Si2O8] |
| O | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| O | β Garnet Group | X3Z2(SiO4)3 |
| O | β Microcline | K(AlSi3O8) |
| O | β Quartz | SiO2 |
| O | β Sillimanite | Al2(SiO4)O |
| O | β Spinel | MgAl2O4 |
| O | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
| O | β Albite | Na(AlSi3O8) |
| F | Fluorine | |
| F | β Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| F | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Na | Sodium | |
| Na | β Albite var. Andesine | (Na,Ca)[Al(Si,Al)Si2O8] |
| Na | β Albite | Na(AlSi3O8) |
| Mg | Magnesium | |
| Mg | β Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
| Mg | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Mg | β Spinel | MgAl2O4 |
| Al | Aluminium | |
| Al | β Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
| Al | β Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Al | β Albite var. Andesine | (Na,Ca)[Al(Si,Al)Si2O8] |
| Al | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Al | β Microcline | K(AlSi3O8) |
| Al | β Sillimanite | Al2(SiO4)O |
| Al | β Spinel | MgAl2O4 |
| Al | β Albite | Na(AlSi3O8) |
| Si | Silicon | |
| Si | β Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
| Si | β Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Si | β Albite var. Andesine | (Na,Ca)[Al(Si,Al)Si2O8] |
| Si | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Si | β Garnet Group | X3Z2(SiO4)3 |
| Si | β Microcline | K(AlSi3O8) |
| Si | β Quartz | SiO2 |
| Si | β Sillimanite | Al2(SiO4)O |
| Si | β Albite | Na(AlSi3O8) |
| Cl | Chlorine | |
| Cl | β Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| K | Potassium | |
| K | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| K | β Microcline | K(AlSi3O8) |
| Ca | Calcium | |
| Ca | β Albite var. Andesine | (Na,Ca)[Al(Si,Al)Si2O8] |
| Ti | Titanium | |
| Ti | β Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Ti | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Fe | Iron | |
| Fe | β Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
| Fe | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
References
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Year (asc) Year (desc) Author (A-Z) Author (Z-A)Folinsbee, Robert E. 1940. Gem cordierite from the Great Slave Lake area, N. W. T. Canada. Abstract in the Proceedings of the Annual Meeting, American Mineralogist, Volume 25, p. 216.
Heinrich, E. Wm. 1950. Cordierite in Pegmatite near Micanite, Colorado. American Mineralogist, Volume 35, pp. 173-184.
Lord, C. S. 1942. Cordierite Deposits, in Snare River and Ingray Lake Map-Areas, Northwest Territories. Canada Department of Mines and Resources, Mines and Geology Branch, Geological Survey Memoir 235, p. 53.
Lord, C. S. 1951. Ghost Lake Cordierite Deposits (52), in Mineral Deposits of District of Mackenzie, Northwest Territories. Canada Department of Mines and Technical Surveys, Geological Survey Memoir 261, pp. 154-155.
Traill, R.J. 1970. A catalogue of Canadian Minerals. Geological Survey of Canada, Paper 69-45, p. 168.
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Ghost Lake cordierite occurrence, Yellowknife, Northwest Territories, Canada