Karoo dolerites, Cradock, Inxuba Yethemba Local Municipality, Chris Hani District Municipality, Eastern Cape, South Africai
| Regional Level Types | |
|---|---|
| Karoo dolerites | - not defined - |
| Cradock | Town |
| Inxuba Yethemba Local Municipality | Municipality |
| Chris Hani District Municipality | Municipality |
| Eastern Cape | Province |
| South Africa | Country |
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Latitude & Longitude (WGS84):
32° 14' 52'' South , 25° 51' 40'' East
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Cradock | 32,898 (2012) | 24.6km |
| Somerset East | 16,155 (2012) | 58.6km |
| Adelaide | 12,212 (2012) | 65.3km |
The dolerites in the Cradock district of the Eastern Cape are somewhat famous for two reasons. Firstly, some contain gold, silver and copper mineralization associated with secondary prehnite that occurs with the dolerite. A few of these gold occurrences were exploited during the late 19th and early 20th centuries. The second reason the Karoo dolerites at Cradock are well known, amongst mineral collectors, is the existence of prehnite. The Cradock locality is given as the type-locality for prehnite where it was discovered in the late 18th Century, supposedly by Colonel Prehn. There is some question as to whether this is true or not, i.e., whether the prehnite from Cradock is indeed the type-material, or whether the specimens came from somewhere else in the Karoo regions where dolerites are pervasive and prehnite is a relatively common associated mineral.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Azurite Formula: Cu3(CO3)2(OH)2 |
| ⓘ Prehnite (TL) Formula: Ca2Al2Si3O10(OH)2 Type Locality: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 5 - Nitrates and Carbonates | |||
|---|---|---|---|
| ⓘ | Azurite | 5.BA.05 | Cu3(CO3)2(OH)2 |
| Group 9 - Silicates | |||
| ⓘ | Prehnite (TL) | 9.DP.20 | Ca2Al2Si3O10(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| H | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| C | Carbon | |
| C | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| O | Oxygen | |
| O | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| O | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Al | Aluminium | |
| Al | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Si | Silicon | |
| Si | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Cu | Copper | |
| Cu | ⓘ Azurite | Cu3(CO3)2(OH)2 |
Other Regions, Features and Areas containing this locality
AfricaContinent
African PlateTectonic Plate
- Karoo basinBasin
- Namaqua-Natal BeltOrogenic Belt
South Africa
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Karoo dolerites, Cradock, Inxuba Yethemba Local Municipality, Chris Hani District Municipality, Eastern Cape, South Africa