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Riemvasmaak fluorite occurrences, Riemvasmaak, Kakamas, ZF Mgcawu District, Northern Cape Province, South Africa

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 27° South , 21° East (est.)
Margin of Error:~1km
Locality type:Group of Occurrences
Köppen climate type:BWh : Hot deserts climate


The location is given as 3 km north of the village of Riemvasmaak.

Excellent vibrant green fluorite, partly covered with thin sugary quartz crusts appeared on the market in 2004 although specimens are known from the region from the 1970s (Johannesburg Geology Museum collection). Yellow, yellow-green, purple, pale green and colourless phantom crystals have also been found.
The quartz crusts only coats the fluorite whereas the associated matrix and quartz crystals remain uncoated, the crusts are usually (partly) dissolved with HF before they come on the market.

The cause of the beautiful green colour is unknown, it may be related to associated radioactive or rare-earth species, samples where tested and yielded surprising results; isotopes in the rare-earth element lanthanide series; lanthanum, ytterbium, cerium, neodymium, samarium, europium, gadolinium and holmium were detected although amounts were not determined.




Alternative Label Names

This is a list of additional names that have been recorded for mineral labels associated with this locality in the minID database. This may include previous versions of the locality name hierarchy from mindat.org, data entry errors, and it may also include unconfirmed sublocality names or other names that can only be matched to this level.

Riemvasmaak fluorite occurrences, Kakamas, ZF Mgcawu District, Northern Cape Province, South Africa
Riemvasmaak, Northern Cape Province, South Africa
Riemvasmaak, Northern Cape, South Africa
Riemvasmaak, Kakamas, ZF Mgcawu District, Northern Cape Province, South Africa

Regions containing this locality

Kalahari Desert, Africa

Desert - 270 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


4 valid minerals.

Detailed Mineral List:

Allanite-(Ce)
Formula: {CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Reference: Minerals of South Africa
Fluorite
Formula: CaF2
Reference: Fluorite: The Collector's Choice. Extra Lapis English No. 9; Mineralogical Record 40:307-324; Miller, D. (2010): Die Fluorite von Riemvasmaak, Südafrika - ein Besuch vor Ort. Lapis 35 (4), 38-44; 54.
Hematite
Formula: Fe2O3
Reference: Mineralogical Record 40:307-324
Quartz
Formula: SiO2
Reference: Mineralogical Record 40:307-324
Quartz var: Amethyst
Formula: SiO2
Reference: Mineralogical Record 40:307-324

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
Group 9 - Silicates
'Allanite-(Ce)'9.BG.05b{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Allanite-(Ce)58.2.1a.1{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
var: Amethyst-SiO2

List of minerals for each chemical element

HHydrogen
H Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
OOxygen
O Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
O Quartz (var: Amethyst)SiO2
O HematiteFe2O3
O QuartzSiO2
FFluorine
F FluoriteCaF2
AlAluminium
Al Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
SiSilicon
Si Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Si Quartz (var: Amethyst)SiO2
Si QuartzSiO2
CaCalcium
Ca Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Ca FluoriteCaF2
FeIron
Fe Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Fe HematiteFe2O3
CeCerium
Ce Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Cairncross, B. (2007): Mineral news from Southern Africa. Australian Journal of Mineralogy 13, 47-49.
Cairncross, B. (2009): Fluorite from Riemvasmaak, Northern Cape Province, South Africa. Mineralogical Record 40:4 307-324.
Miller, D. (2010): Die Fluorite von Riemvasmaak, Südafrika - ein Besuch vor Ort. Lapis 35 (4), 38-44; 54.


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