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Christopher Island, Baker Lake, Kivalliq Region, Nunavut, Canadai
Regional Level Types
Christopher IslandIsland
Baker LakeLake
Kivalliq RegionRegion
NunavutTerritory
CanadaCountry

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Key
Latitude & Longitude (WGS84):
64° 5' 33'' North , 94° 36' 58'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:


A group of three occurrences on the north western tip of Christopher Island. Miller describes the selenides as: umangite, athabascite, berzelianite, clausthalite and eucairite in various proportions with electrum. The secondary phases include boltwoodite, kasolite, wolsendorfite and malachite.

The Miller Bulletin has XRD and microprobe results for the selenide minerals and their distribution in the sub-localities on Christopher Island. The Athabascaite is Cu4.92Fe0.16Se3.32S0.61; the Berzelianite is Cu6.73Fe0.03Se3.35S0.65; the Umangite is Cu5.57Fe0.05Se4.00S0.0. The Se+S is normalized to 4.0 apfu.

The U-Se-Ag-Au mineralization is present in narrow zones of compound fracturing and brecciation. Subvertical veins contain massive, black, metal-bearing concentrations to 1 cm in width.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


12 valid minerals.

Detailed Mineral List:

Athabascaite
Formula: Cu5Se4
Reference: Miller A. (1980) Uranium Geology of the Eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.
Berzelianite
Formula: Cu2Se
Reference: Miller A. (1980) Uranium Geology of the Eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.
Boltwoodite
Formula: (K,Na)(UO2)(SiO3OH) · 1.5H2O
Reference: Miller A. (1980) Uranium Geology of the Eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.
Clausthalite
Formula: PbSe
Habit: massive
Colour: grey
Fluorescence: none
Description: only metallic there with cubic cleavage.
Reference: Richard Gunter Collection Miller A. (1980) Uranium Geology of the Eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.
'Electrum'
Formula: (Au,Ag)
Reference: Miller A. (1980) Uranium Geology of the Eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.
Eucairite
Formula: AgCuSe
Reference: Miller A. (1980) Uranium Geology of the Eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.
Gold
Formula: Au
Reference: Miller A. (1980) Uranium Geology of the Eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.
Kasolite
Formula: Pb(UO2)[SiO4] · H2O
Reference: Miller A. (1980) Uranium Geology of the Eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.
Klockmannite ?
Formula: CuSe
Description: Not identified by Miller.
Reference: Richard Gunter Collection
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Miller A. (1980) Uranium Geology of the Eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.
Molybdomenite
Formula: PbSeO3
Habit: white lath-like grains
Colour: white
Fluorescence: none
Description: Miller noted "Cerussite" on Clausthalite that is probably Molybdomenite.
Reference: Richard Gunter Collection
Umangite
Formula: Cu3Se2
Habit: grains to 5 mm.
Colour: grey with purple tarnish
Description: polished section samples show Umangite as separate grains in matrix.
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Miller A.: Uranium Geology of the eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.
Wölsendorfite
Formula: Pb7(UO2)14O19(OH)4 · 12H2O
Reference: Miller A. (1980) Uranium Geology of the Eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Electrum'1.AA.05(Au,Ag)
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Athabascaite2.BA.25Cu5Se4
Berzelianite2.BA.20Cu2Se
Clausthalite2.CD.10PbSe
Eucairite2.BA.50AgCuSe
Klockmannite ?2.CA.05bCuSe
Umangite2.BA.25Cu3Se2
Group 4 - Oxides and Hydroxides
Molybdomenite4.JF.05PbSeO3
Wölsendorfite4.GB.30Pb7(UO2)14O19(OH)4 · 12H2O
Group 5 - Nitrates and Carbonates
Malachite5.BA.10Cu2(CO3)(OH)2
Group 9 - Silicates
Boltwoodite9.AK.15(K,Na)(UO2)(SiO3OH) · 1.5H2O
Kasolite9.AK.15Pb(UO2)[SiO4] · H2O

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Berzelianite2.4.10.1Cu2Se
Eucairite2.4.6.2AgCuSe
AmBnXp, with (m+n):p = 3:2
Umangite2.5.1.1Cu3Se2
AmXp, with m:p = 1:1
Clausthalite2.8.1.2PbSe
Klockmannite ?2.8.12.2CuSe
Miscellaneous
Athabascaite2.16.17.1Cu5Se4
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AX2O7·xH2O
Wölsendorfite5.4.3.2Pb7(UO2)14O19(OH)4 · 12H2O
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 34 - SELENITES, TELLURITES AND SULFITES
A(XO3)
Molybdomenite34.1.1.1PbSeO3
Group 53 - NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
Boltwoodite53.3.1.5(K,Na)(UO2)(SiO3OH) · 1.5H2O
Kasolite53.3.1.1Pb(UO2)[SiO4] · H2O
Unclassified Minerals, Mixtures, etc.
'Electrum'-(Au,Ag)

List of minerals for each chemical element

HHydrogen
H Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2O
H KasolitePb(UO2)[SiO4] · H2O
H WölsendorfitePb7(UO2)14O19(OH)4 · 12H2O
H MalachiteCu2(CO3)(OH)2
CCarbon
C MalachiteCu2(CO3)(OH)2
OOxygen
O MolybdomenitePbSeO3
O Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2O
O KasolitePb(UO2)[SiO4] · H2O
O WölsendorfitePb7(UO2)14O19(OH)4 · 12H2O
O MalachiteCu2(CO3)(OH)2
NaSodium
Na Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2O
SiSilicon
Si Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2O
Si KasolitePb(UO2)[SiO4] · H2O
KPotassium
K Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2O
CuCopper
Cu UmangiteCu3Se2
Cu BerzelianiteCu2Se
Cu EucairiteAgCuSe
Cu AthabascaiteCu5Se4
Cu MalachiteCu2(CO3)(OH)2
Cu KlockmanniteCuSe
SeSelenium
Se UmangiteCu3Se2
Se BerzelianiteCu2Se
Se EucairiteAgCuSe
Se ClausthalitePbSe
Se MolybdomenitePbSeO3
Se AthabascaiteCu5Se4
Se KlockmanniteCuSe
AgSilver
Ag EucairiteAgCuSe
Ag Electrum(Au,Ag)
AuGold
Au Electrum(Au,Ag)
Au GoldAu
PbLead
Pb ClausthalitePbSe
Pb MolybdomenitePbSeO3
Pb KasolitePb(UO2)[SiO4] · H2O
Pb WölsendorfitePb7(UO2)14O19(OH)4 · 12H2O
UUranium
U Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2O
U KasolitePb(UO2)[SiO4] · H2O
U WölsendorfitePb7(UO2)14O19(OH)4 · 12H2O

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Miller A. (1980) Uranium Geology of the Eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.

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