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Riemvasmaak fluorite occurrences, Riemvasmaak, Kakamas, Kai !Garib Local Municipality, ZF Mgcawu District Municipality, Northern Cape, South Africai
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Latitude & Longitude (WGS84):
28° 25' 42'' South , 20° 18' 51'' East
Latitude & Longitude (decimal):
Type:
Group of Occurrences
Köppen climate type:
3 km north of the village of Riemvasmaak. There are 2 sites visible from Google Earth (11/2021 imagery). The 2nd is about 70m N of the coordinates given
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.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Allanite-(Ce) Formula: (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| ⓘ Fluorite Formula: CaF2 References: |
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Quartz var. Amethyst Formula: SiO2 |
| ⓘ Quartz var. Sceptre Quartz Formula: SiO2 |
List of minerals arranged by Strunz 10th Edition classification
| Group 3 - Halides | |||
|---|---|---|---|
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Quartz var. Amethyst | 4.DA.05 | SiO2 |
| ⓘ | 4.DA.05 | SiO2 | |
| ⓘ | var. Sceptre Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Allanite-(Ce) | 9.BG.05b | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| O | Oxygen | |
| O | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| O | ⓘ Quartz var. Amethyst | SiO2 |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Quartz var. Sceptre Quartz | SiO2 |
| F | Fluorine | |
| F | ⓘ Fluorite | CaF2 |
| Al | Aluminium | |
| Al | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| Si | Silicon | |
| Si | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Quartz var. Amethyst | SiO2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Quartz var. Sceptre Quartz | SiO2 |
| Ca | Calcium | |
| Ca | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Fluorite | CaF2 |
| Fe | Iron | |
| Fe | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Hematite | Fe2O3 |
| Ce | Cerium | |
| Ce | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
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Riemvasmaak fluorite occurrences, Riemvasmaak, Kakamas, Kai !Garib Local Municipality, ZF Mgcawu District Municipality, Northern Cape, South Africa