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"Christmas Point" pegmatite, Khmara Bay, Casey Bay, Napier Complex, Enderby Land, Eastern Antarctica, Antarcticai
Regional Level Types
"Christmas Point" pegmatitePegmatite
Khmara BayBay
Casey BayBay
Napier ComplexComplex
Enderby LandExposure
Eastern AntarcticaRegion
AntarcticaContinent

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Latitude & Longitude (WGS84):
67° 22' 55'' South , 48° 57' 59'' East
Latitude & Longitude (decimal):
-67.38202,48.96658
GeoHash:
G#: jh4bdm2rk
GRN:
S45E15
Type:
Pegmatite
KΓΆppen climate type:
EF : Ice cap climate
Mindat Locality ID:
125896
Long-form identifier:
mindat:1:2:125896:0
GUID (UUID V4):
c65c47aa-cd74-4d00-ace3-48caf9d1648a


Podiform Be-bearing pegmatites of probable late Archean age which cut granulite-facies rocks at the south end of an unnamed island of the Field Islands, 5 km WSW of McIntyre Island, in Khamra Bay.

The first "Christmas Point" pegmatite, described by Grew (1981), is 1.5 m thick and is one of a series of en Γ©chelon pods in a layer of quartz granulite containing sapphirine, orthopyroxene, sillimanite, and garnet. This pegmatite consists of coarse-grained (>l cm) quartz, microrcline, apatite, biotite and sillimanite, and of medium-grained (mostly 0.05-2 mm) dense segregations rich in sillimanite, garnet, cordierite, biotite, yellow-brown apatite, and surinamite. In hand specimens, much of the microcline is red. Sillimanite crystals (up to 10 cm long and 3 cm across) are white or brown; brown sillimanite is chatoyant. The medium-grained segregations form irregular veins, masses, and stringers up to 5 cm across. In addition to the above listed minerals, some samples of the medium-grained segregations contain orthopyroxene, wagnerite, pyrite, "ilmeno-hematite" (titanohematite with ferrian ilmenite exsolution lamellae), magnetite, and monazite. Zircon, xenotime, corundum, and other species are less abundant.

A second beryllium pegmatite was found nearby in 1999 (Grew et al., 2000). Also this pegmatite has a quartz core, where the surinamite-Β­bearing aggregates are more abundant, and an outer zone rich in microcline. Nodules up to 5 cm across of coarse-grained sapphirine-khmaralite in quartz are unique to this pegmatite. Another mineral exclusive of this pegmatite is magnesiotaaffeite-6N'3S.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


22 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 Diagram

Detailed Mineral List:

β“˜ Almandine
Formula: Fe2+3Al2(SiO4)3
β“˜ 'Amphibole Supergroup'
Formula: AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
β“˜ Andalusite
Formula: Al2(SiO4)O
β“˜ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
β“˜ 'Chlorite Group'
β“˜ Cordierite
Formula: (Mg,Fe)2Al3(AlSi5O18)
β“˜ Corundum
Formula: Al2O3
β“˜ Fluorapatite
Formula: Ca5(PO4)3F
β“˜ Hematite
Formula: Fe2O3
β“˜ Hematite var. Titanohematite
β“˜ 'HΓΆgbomite'
Formula: (Mg,Fe)2(Al,Ti)5O10
β“˜ Ilmenite
Formula: Fe2+TiO3
β“˜ Ilmenite var. Ferrian Ilmenite
Formula: (Fe,Ti)2O3
β“˜ Khmaralite
Formula: (Mg,Al,Fe)16[(Al,Si,Be)12O36]O4
β“˜ Kyanite
Formula: Al2(SiO4)O
β“˜ Magnesiotaaffeite-6N’3S
Formula: Mg2BeAl6O12
β“˜ Magnetite
Formula: Fe2+Fe3+2O4
β“˜ Microcline
Formula: K(AlSi3O8)
β“˜ 'Monazite'
Formula: REE(PO4)
β“˜ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ 'Orthopyroxene Subgroup'
β“˜ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
β“˜ Pyrite
Formula: FeS2
β“˜ Quartz
Formula: SiO2
β“˜ Rutile
Formula: TiO2
β“˜ Sapphirine
Formula: Mg4(Mg3Al9)O4[Si3Al9O36]
β“˜ Sillimanite
Formula: Al2(SiO4)O
β“˜ Spinel
Formula: MgAl2O4
β“˜ Surinamite
Formula: (Mg,Fe)3Al4BeSi3O16
β“˜ Wagnerite
Formula: (Mg,Fe2+)2(PO4)F
β“˜ 'Xenotime'
β“˜ Zircon
Formula: Zr(SiO4)

Gallery:

Al2(SiO4)Oβ“˜ Sillimanite
(Mg,Fe)3Al4BeSi3O16β“˜ Surinamite

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
β“˜Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
β“˜Spinel4.BB.05MgAl2O4
β“˜Magnetite4.BB.05Fe2+Fe3+2O4
β“˜Hematite
var. Titanohematite		4.CB.05Fe2O3
β“˜Ilmenite4.CB.05Fe2+TiO3
β“˜var. Ferrian Ilmenite4.CB.05(Fe,Ti)2O3
β“˜Corundum4.CB.05Al2O3
β“˜Hematite4.CB.05Fe2O3
β“˜Quartz4.DA.05SiO2
β“˜Rutile4.DB.05TiO2
β“˜Magnesiotaaffeite-6N’3S4.FC.25Mg2BeAl6O12
Group 8 - Phosphates, Arsenates and Vanadates
β“˜Wagnerite8.BB.15(Mg,Fe2+)2(PO4)F
β“˜Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
β“˜Almandine9.AD.25Fe2+3Al2(SiO4)3
β“˜Zircon9.AD.30Zr(SiO4)
β“˜Sillimanite9.AF.05Al2(SiO4)O
β“˜Andalusite9.AF.10Al2(SiO4)O
β“˜Kyanite9.AF.15Al2(SiO4)O
β“˜Cordierite9.CJ.10(Mg,Fe)2Al3(AlSi5O18)
β“˜Sapphirine9.DH.45Mg4(Mg3Al9)O4[Si3Al9O36]
β“˜Khmaralite9.DH.50(Mg,Al,Fe)16[(Al,Si,Be)12O36]O4
β“˜Surinamite9.DH.55(Mg,Fe)3Al4BeSi3O16
β“˜Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜Microcline9.FA.30K(AlSi3O8)
Unclassified
β“˜'Chlorite Group'-
β“˜'HΓΆgbomite'-(Mg,Fe)2(Al,Ti)5O10
β“˜'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
β“˜'Monazite'-REE(PO4)
β“˜'Xenotime'-
β“˜'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
β“˜'Orthopyroxene Subgroup'-
β“˜'Amphibole Supergroup'-AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2

List of minerals for each chemical element

HHydrogen
Hβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Hβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
BeBeryllium
Beβ“˜ Magnesiotaaffeite-6N’3SMg2BeAl6O12
Beβ“˜ Surinamite(Mg,Fe)3Al4BeSi3O16
Beβ“˜ Khmaralite(Mg,Al,Fe)16[(Al,Si,Be)12O36]O4
OOxygen
Oβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Oβ“˜ AndalusiteAl2(SiO4)O
Oβ“˜ AlmandineFe32+Al2(SiO4)3
Oβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oβ“˜ Cordierite(Mg,Fe)2Al3(AlSi5O18)
Oβ“˜ CorundumAl2O3
Oβ“˜ FluorapatiteCa5(PO4)3F
Oβ“˜ HematiteFe2O3
Oβ“˜ HΓΆgbomite(Mg,Fe)2(Al,Ti)5O10
Oβ“˜ IlmeniteFe2+TiO3
Oβ“˜ KyaniteAl2(SiO4)O
Oβ“˜ MagnetiteFe2+Fe23+O4
Oβ“˜ MicroclineK(AlSi3O8)
Oβ“˜ MonaziteREE(PO4)
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ Magnesiotaaffeite-6N’3SMg2BeAl6O12
Oβ“˜ QuartzSiO2
Oβ“˜ RutileTiO2
Oβ“˜ SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Oβ“˜ SillimaniteAl2(SiO4)O
Oβ“˜ SpinelMgAl2O4
Oβ“˜ Surinamite(Mg,Fe)3Al4BeSi3O16
Oβ“˜ Wagnerite(Mg,Fe2+)2(PO4)F
Oβ“˜ ZirconZr(SiO4)
Oβ“˜ Khmaralite(Mg,Al,Fe)16[(Al,Si,Be)12O36]O4
Oβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Oβ“˜ Ilmenite var. Ferrian Ilmenite(Fe,Ti)2O3
FFluorine
Fβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Fβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fβ“˜ FluorapatiteCa5(PO4)3F
Fβ“˜ Wagnerite(Mg,Fe2+)2(PO4)F
NaSodium
Naβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mgβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgβ“˜ Cordierite(Mg,Fe)2Al3(AlSi5O18)
Mgβ“˜ HΓΆgbomite(Mg,Fe)2(Al,Ti)5O10
Mgβ“˜ Magnesiotaaffeite-6N’3SMg2BeAl6O12
Mgβ“˜ SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Mgβ“˜ SpinelMgAl2O4
Mgβ“˜ Surinamite(Mg,Fe)3Al4BeSi3O16
Mgβ“˜ Wagnerite(Mg,Fe2+)2(PO4)F
Mgβ“˜ Khmaralite(Mg,Al,Fe)16[(Al,Si,Be)12O36]O4
AlAluminium
Alβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Alβ“˜ AndalusiteAl2(SiO4)O
Alβ“˜ AlmandineFe32+Al2(SiO4)3
Alβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alβ“˜ Cordierite(Mg,Fe)2Al3(AlSi5O18)
Alβ“˜ CorundumAl2O3
Alβ“˜ HΓΆgbomite(Mg,Fe)2(Al,Ti)5O10
Alβ“˜ KyaniteAl2(SiO4)O
Alβ“˜ MicroclineK(AlSi3O8)
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Alβ“˜ Magnesiotaaffeite-6N’3SMg2BeAl6O12
Alβ“˜ SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Alβ“˜ SillimaniteAl2(SiO4)O
Alβ“˜ SpinelMgAl2O4
Alβ“˜ Surinamite(Mg,Fe)3Al4BeSi3O16
Alβ“˜ Khmaralite(Mg,Al,Fe)16[(Al,Si,Be)12O36]O4
Alβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Siβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Siβ“˜ AndalusiteAl2(SiO4)O
Siβ“˜ AlmandineFe32+Al2(SiO4)3
Siβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siβ“˜ Cordierite(Mg,Fe)2Al3(AlSi5O18)
Siβ“˜ KyaniteAl2(SiO4)O
Siβ“˜ MicroclineK(AlSi3O8)
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ QuartzSiO2
Siβ“˜ SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Siβ“˜ SillimaniteAl2(SiO4)O
Siβ“˜ Surinamite(Mg,Fe)3Al4BeSi3O16
Siβ“˜ ZirconZr(SiO4)
Siβ“˜ Khmaralite(Mg,Al,Fe)16[(Al,Si,Be)12O36]O4
Siβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
PPhosphorus
Pβ“˜ FluorapatiteCa5(PO4)3F
Pβ“˜ MonaziteREE(PO4)
Pβ“˜ Wagnerite(Mg,Fe2+)2(PO4)F
SSulfur
Sβ“˜ PyriteFeS2
ClChlorine
Clβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
Kβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kβ“˜ MicroclineK(AlSi3O8)
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caβ“˜ FluorapatiteCa5(PO4)3F
Caβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
TiTitanium
Tiβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Tiβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Tiβ“˜ HΓΆgbomite(Mg,Fe)2(Al,Ti)5O10
Tiβ“˜ IlmeniteFe2+TiO3
Tiβ“˜ RutileTiO2
Tiβ“˜ Ilmenite var. Ferrian Ilmenite(Fe,Ti)2O3
FeIron
Feβ“˜ AlmandineFe32+Al2(SiO4)3
Feβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feβ“˜ Cordierite(Mg,Fe)2Al3(AlSi5O18)
Feβ“˜ HematiteFe2O3
Feβ“˜ HΓΆgbomite(Mg,Fe)2(Al,Ti)5O10
Feβ“˜ IlmeniteFe2+TiO3
Feβ“˜ MagnetiteFe2+Fe23+O4
Feβ“˜ PyriteFeS2
Feβ“˜ Surinamite(Mg,Fe)3Al4BeSi3O16
Feβ“˜ Wagnerite(Mg,Fe2+)2(PO4)F
Feβ“˜ Khmaralite(Mg,Al,Fe)16[(Al,Si,Be)12O36]O4
Feβ“˜ Ilmenite var. Ferrian Ilmenite(Fe,Ti)2O3
ZrZirconium
Zrβ“˜ ZirconZr(SiO4)

Other Regions, Features and Areas containing this locality

Antarctic MeteoritesGroup of Meteorite Fall Locations
Antarctic PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

(n.d.)
Grew, E.S. (1981) Surinamite, taaffeite and beryllian sapphirine from pegmatites in granulite-facies rocks of Casey Bay, Enderby Land, Antarctica. American Mineralogist, 66(9-10), 1022-1033.
Grew, E.S., Yates, M.G., Barbier, J., Shearer, C.K., Sheraton, J.W., Shiraishi, K., and Motoyoshi, Y. (2000) Granulite-facies beryllium pegmatites in the Napier Complex in Khmara and Amundsen Bays, western Enderby Land, East Antarctica. Polar Geoscience, 13, 1-40.
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