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Gravelotte Emerald Mine, Gravelotte, Murchison Range, Limpopo, South Africai
Regional Level Types
Gravelotte Emerald MineMine
Gravelotte- not defined -
Murchison RangeMountain Range
LimpopoProvince
South AfricaCountry

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Latitude & Longitude (WGS84): 23° 57' South , 30° 37' East
Latitude & Longitude (decimal): -23.95000,30.61667
GeoHash:G#: ketzb8n3h
Locality type:Mine
Köppen climate type:BSh : Hot semi-arid (steppe) climate
Nearest Settlements:
PlacePopulationDistance
Nkowakowa30,138 (2014)34.2km
Tzaneen16,954 (2013)47.8km


Emeralds crystallized where beryllium-bearing, potassium-rich pegmatites intruded into ultramafic komatiitic schists of the Murchison Greenstone Belt. Emeralds are principally hosted within the biotitic alteration envelope that surrounds the pegmatite; these represent localized zones of intense potassic alteration. A minor amount of emeralds is hosted by the pegmatite.

Regions containing this locality

Somali Plate (Somalia Plate)Tectonic Plate
Transvaal, South AfricaProvince (Former)

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

7 valid minerals.

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Reference: Minerals of South Africa
'Apatite'
Reference: Minerals of South Africa
Beryl
Formula: Be3Al2(Si6O18)
Reference: Minerals of South Africa
Beryl var: Emerald
Formula: Be3Al2(Si6O18)
Reference: Minerals of South Africa
'Biotite'
Reference: Minerals of South Africa
'Chlorite Group'
Reference: Minerals of South Africa
'Feldspar Group'
Reference: Minerals of South Africa
Molybdenite
Formula: MoS2
Pyrite
Formula: FeS2
Reference: Minerals of South Africa
Quartz
Formula: SiO2
Reference: Minerals of South Africa
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Minerals of South Africa
Talc
Formula: Mg3Si4O10(OH)2
Reference: Minerals of South Africa

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 9 - Silicates
Actinolite9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Beryl9.CJ.05Be3Al2(Si6O18)
var: Emerald9.CJ.05Be3Al2(Si6O18)
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Talc9.EC.05Mg3Si4O10(OH)2
Unclassified Minerals, Rocks, etc.
'Apatite'-
'Biotite'-
'Chlorite Group'-
'Feldspar Group'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Talc71.2.1.3Mg3Si4O10(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
'Apatite'-
Beryl
var: Emerald
-Be3Al2(Si6O18)
'Biotite'-
'Chlorite Group'-
'Feldspar Group'-

List of minerals for each chemical element

HHydrogen
H TalcMg3Si4O10(OH)2
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
BeBeryllium
Be Beryl (var: Emerald)Be3Al2(Si6O18)
Be BerylBe3Al2(Si6O18)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O Beryl (var: Emerald)Be3Al2(Si6O18)
O BerylBe3Al2(Si6O18)
O TalcMg3Si4O10(OH)2
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O QuartzSiO2
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mg TalcMg3Si4O10(OH)2
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
AlAluminium
Al Beryl (var: Emerald)Be3Al2(Si6O18)
Al BerylBe3Al2(Si6O18)
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
SiSilicon
Si Beryl (var: Emerald)Be3Al2(Si6O18)
Si BerylBe3Al2(Si6O18)
Si TalcMg3Si4O10(OH)2
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si QuartzSiO2
SSulfur
S MolybdeniteMoS2
S PyriteFeS2
CaCalcium
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
FeIron
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe PyriteFeS2
MoMolybdenum
Mo MolybdeniteMoS2

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

Archean
2500 - 4000 Ma



ID: 2230158
Gravelotte Group

Age: Archean (2500 - 4000 Ma)

Stratigraphic Name: Gravelotte Group

Description: Mafic lavas, various chlorite schists, quartzites, conglomerates, grits, porphyritic tuffs, banded iron-formation, ultramafic lavas

Reference: Council for Geoscience. Geologic map of South Africa, 1:1M. National Science Councils of South Africa. [41]

Neoarchean - Mesoarchean
2500 - 3200 Ma



ID: 3309350

Age: Archean (2500 - 3200 Ma)

Lithology: Volcanic-sedimentary

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

Mesoarchean - Paleoarchean
2800 - 3600 Ma



ID: 3187538
Archean crystalline metamorphic rocks

Age: Archean (2800 - 3600 Ma)

Lithology: Crystalline metamorphic rocks

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]

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

Localities in this Region
Show map

  • Limpopo
    • Murchison Range
      • Gravelotte

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