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Girtis Farm 109, Karasburg East, Karas Region, Namibiai
Regional Level Types
Girtis Farm 109Farm
Karasburg EastConstituency
Karas RegionRegion
NamibiaCountry

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Latitude & Longitude (WGS84): 28° 50' 41'' South , 18° 51' 42'' East
Latitude & Longitude (decimal): -28.84496,18.86175
GeoHash:G#: k6v7vhyty
Locality type:Farm
Köppen climate type:BWh : Hot deserts climate
Nearest Settlements:
PlacePopulationDistance
Warmbad6,700 (2012)45.6km


Locality borders onto the Orange River and is next to Girtis Farm 109. Pale to dark amethyst quartz was mined sporadically on Girtis farm prior to the major finds of the late 1990's. The 'Kalkgat pocket' on Girtis comprised of superb large crystals of intense reddish-brown colour often on pink albite or as floater groups.

Regions containing this locality

African PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 valid minerals.

Detailed Mineral List:

Cordierite
Formula: (Mg,Fe)2Al3(AlSi5O18)
Reference: Bezing, L. von, Bode, R. & Jahn, S. (2008): Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, 510 pp. (in English)
Corundum
Formula: Al2O3
Reference: Bezing, L. von, Bode, R. & Jahn, S. (2008): Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, 512 pp. (in English)
Fluorite
Formula: CaF2
Habit: Octahedra
Colour: Purple and pale yellow
Description: Crystals to 4cm on quartz. It is unclear which of the specimens labelled Orange River are from the Namibian side as most may actually come from the South African side.
Reference: Von Bezing, L., Bode, R., and Jahn, S., (2008) Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern. 547 (in English).
Hematite
Formula: Fe2O3
Reference: Bezing, L. von, Bode, R. & Jahn, S. (2008): Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, 388 pp. (in English)
Quartz
Formula: SiO2
Reference: Bezing, L. von, Bode, R. & Jahn, S. (2008): Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, 386 pp. (in English)
Quartz var: Amethyst
Formula: SiO2
Reference: Bezing, L. von, Bode, R. & Jahn, S. (2008): Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, 386 pp. (in English)

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Corundum4.CB.05Al2O3
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
Group 9 - Silicates
Cordierite9.CJ.10(Mg,Fe)2Al3(AlSi5O18)

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Corundum4.3.1.1Al2O3
Hematite4.3.1.2Fe2O3
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with Al substituted rings
Cordierite61.2.1.1(Mg,Fe)2Al3(AlSi5O18)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
var: Amethyst-SiO2

List of minerals for each chemical element

OOxygen
O CorundumAl2O3
O QuartzSiO2
O Quartz (var: Amethyst)SiO2
O HematiteFe2O3
O Cordierite(Mg,Fe)2Al3(AlSi5O18)
FFluorine
F FluoriteCaF2
MgMagnesium
Mg Cordierite(Mg,Fe)2Al3(AlSi5O18)
AlAluminium
Al CorundumAl2O3
Al Cordierite(Mg,Fe)2Al3(AlSi5O18)
SiSilicon
Si QuartzSiO2
Si Quartz (var: Amethyst)SiO2
Si Cordierite(Mg,Fe)2Al3(AlSi5O18)
CaCalcium
Ca FluoriteCaF2
FeIron
Fe HematiteFe2O3
Fe Cordierite(Mg,Fe)2Al3(AlSi5O18)

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Neoproterozoic - Mesoproterozoic
541 - 1600 Ma



ID: 3190510
Mesoproterozoic-Neoproterozoic crystalline metamorphic rocks

Age: Proterozoic (541 - 1600 Ma)

Comments: Bushmanland

Lithology: Orthogneiss/paragneiss

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Statherian - Orosirian
1600 - 2050 Ma



ID: 3306224

Age: Paleoproterozoic (1600 - 2050 Ma)

Lithology: Plutonic and metamorphic

Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Bezing, L. von, Bode, R. & Jahn, S. (2008): Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, 386-388 pp. (in English)


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