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Pedra Preta pit, Serra das Éguas, Brumado (Bom Jesus dos Meiras), Bahia, Brazil

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Name(s) in local language(s):Mina Pedra Preta, Serra das Éguas, Brumado, Estado da Bahia, Brasil
Latitude & Longitude (WGS84): 14° 8' 33'' South , 41° 41' 44'' West
Latitude & Longitude (decimal): -14.14250,-41.69556
GeoHash:G#: 7j6re1qjz
Locality type:Pit
Köppen climate type:BSh : Hot semi-arid (steppe) climate


Discovered in the early 1930s.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


18 valid minerals. 1 (TL) - type locality of valid minerals.

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Reference: Cassedanne, J.P. & Cassedanne, J.O. (1978): Famous mineral localities: The Brumado district, Bahia , Brazil. Mineralogical Record 9 : 196-205
Beryl
Formula: Be3Al2(Si6O18)
Reference: Keith Compton
Beryl var: Aquamarine
Formula: Be3Al2Si6O18
Reference: Keith Compton
Brumadoite (TL)
Formula: Cu3(Te6+O4)(OH)4 · 5H2O
Reference: Mineralogical Magazine72,1201-1205(2008)
Dolomite
Formula: CaMg(CO3)2
Reference: Cassedanne, J.P. & Cassedanne, J.O. (1978): Famous mineral localities: The Brumado district, Bahia , Brazil. Mineralogical Record 9 : 196-205
Dravite
Formula: Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Rob Lavinsky photo
'Feldspar Group'
Reference: Keith Compton
Hematite
Formula: Fe2O3
Reference: Cassedanne, J.P. & Cassedanne, J.O. (1978): Famous mineral localities: The Brumado district, Bahia , Brazil. Mineralogical Record 9 : 196-205
Magnesite
Formula: MgCO3
Reference: Cassedanne, J.P. & Cassedanne, J.O. (1978): Famous mineral localities: The Brumado district, Bahia , Brazil. Mineralogical Record 9 : 196-205
Metazeunerite
Formula: Cu(UO2)2(AsO4)2 · 8H2O
Reference: Cassedanne, J.P. & Cassedanne, J.O. (1978): Famous mineral localities: The Brumado district, Bahia , Brazil. Mineralogical Record 9 : 196-205
Mottramite
Formula: PbCu(VO4)(OH)
Reference: Mineralogical Magazine72,1201-1205(2008)
'Nováčekite'
Reference: Van King
Nováčekite-I
Formula: Mg(UO2)2(AsO4)2 · 12H2O
Reference: Cassedanne, J.P. & Cassedanne, J.O. (1978): Famous mineral localities: The Brumado district, Bahia , Brazil. Mineralogical Record 9 : 196-205
Quartz
Formula: SiO2
Reference: [MinRec 14:179]
Rutile
Formula: TiO2
Reference: No reference listed
Sellaite
Formula: MgF2
Description: The finest for the species - crystals to 5cm.
Reference: Cassedanne, J.P & Resende, J. P. (1983): Sellaite from the Brumado mine. Mineralogical Record 14 (3): 179-181
Sklodowskite
Formula: Mg(UO2)2(SiO3OH)2 · 6H2O
Reference: Cassedanne, J.P. & Cassedanne, J.O. (1978): Famous mineral localities: The Brumado district, Bahia , Brazil. Mineralogical Record 9 : 196-205
Talc
Formula: Mg3Si4O10(OH)2
Reference: Mineralogical Record 9:196-205
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Reference: [MinRec 14:179]
Uraninite
Formula: UO2
Habit: irregular blebs
Colour: black
Reference: Cassedanne, J.P. & Cassedanne, J.O. (1978): Famous mineral localities: The Brumado district, Bahia , Brazil. Mineralogical Record 9 : 196-205
'Uvite Series' ?
Formula: Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Description: No F-dominance proven.
Reference: Carlos Barbosa
Zeunerite
Formula: Cu(UO2)2(AsO4)2 · 12H2O
Reference: [MinRec 7:129]

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
Sellaite3.AB.15MgF2
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Uraninite4.DL.05UO2
Group 5 - Nitrates and Carbonates
Dolomite5.AB.10CaMg(CO3)2
Magnesite5.AB.05MgCO3
Group 8 - Phosphates, Arsenates and Vanadates
Metazeunerite8.EB.10Cu(UO2)2(AsO4)2 · 8H2O
Mottramite8.BH.40PbCu(VO4)(OH)
Nováčekite-I8.EB.05Mg(UO2)2(AsO4)2 · 12H2O
Zeunerite8.EB.05Cu(UO2)2(AsO4)2 · 12H2O
Group 9 - Silicates
'Actinolite'9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Beryl9.CJ.05Be3Al2(Si6O18)
var: Aquamarine9.CJ.05Be3Al2Si6O18
Dravite9.CK.05Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Sklodowskite9.AK.10Mg(UO2)2(SiO3OH)2 · 6H2O
Talc9.EC.05Mg3Si4O10(OH)2
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Uvite Series ?9..Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Unclassified Minerals, Rocks, etc.
Brumadoite (TL)-Cu3(Te6+O4)(OH)4 · 5H2O
Feldspar Group-
Nováčekite-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
AX2
Rutile4.4.1.1TiO2
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
Group 9 - NORMAL HALIDES
AX2
Sellaite9.2.2.1MgF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Magnesite14.1.1.2MgCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 33 - SELENATES AND TELLURATES
(AB)m(XO4)pZq
Brumadoite (TL)33.1.6.Cu3(Te6+O4)(OH)4 · 5H2O
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
AB2(XO4)2·xH2O, containing (UO2)2+
Metazeunerite40.2a.14.2Cu(UO2)2(AsO4)2 · 8H2O
Nováčekite-I40.2a.10.1Mg(UO2)2(AsO4)2 · 12H2O
Zeunerite40.2a.14.1Cu(UO2)2(AsO4)2 · 12H2O
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Mottramite41.5.2.2PbCu(VO4)(OH)
Group 53 - NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
Sklodowskite53.3.1.3Mg(UO2)2(SiO3OH)2 · 6H2O
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
Dravite61.3.1.9Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
'Uvite Series' ?61.3.1.3Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Tremolite66.1.3a.1☐{Ca2}{Mg5}(Si8O22)(OH)2
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, Rocks, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Beryl
var: Aquamarine
-Be3Al2Si6O18
'Feldspar Group'-
'Nováčekite'-

List of minerals for each chemical element

HHydrogen
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H BrumadoiteCu3(Te6+O4)(OH)4 · 5H2O
H DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
H MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
H MottramitePbCu(VO4)(OH)
H Nováčekite-IMg(UO2)2(AsO4)2 · 12H2O
H SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2O
H TalcMg3Si4O10(OH)2
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
H ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
BeBeryllium
Be Beryl (var: Aquamarine)Be3Al2Si6O18
Be BerylBe3Al2(Si6O18)
BBoron
B DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
CCarbon
C DolomiteCaMg(CO3)2
C MagnesiteMgCO3
OOxygen
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O Beryl (var: Aquamarine)Be3Al2Si6O18
O BerylBe3Al2(Si6O18)
O BrumadoiteCu3(Te6+O4)(OH)4 · 5H2O
O DolomiteCaMg(CO3)2
O DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
O HematiteFe2O3
O MagnesiteMgCO3
O MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
O MottramitePbCu(VO4)(OH)
O Nováčekite-IMg(UO2)2(AsO4)2 · 12H2O
O QuartzSiO2
O RutileTiO2
O SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2O
O TalcMg3Si4O10(OH)2
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
O UraniniteUO2
O ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
FFluorine
F SellaiteMgF2
NaSodium
Na DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Mg DolomiteCaMg(CO3)2
Mg DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Mg MagnesiteMgCO3
Mg Nováčekite-IMg(UO2)2(AsO4)2 · 12H2O
Mg SellaiteMgF2
Mg SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2O
Mg TalcMg3Si4O10(OH)2
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
AlAluminium
Al Beryl (var: Aquamarine)Be3Al2Si6O18
Al BerylBe3Al2(Si6O18)
Al DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
SiSilicon
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si Beryl (var: Aquamarine)Be3Al2Si6O18
Si BerylBe3Al2(Si6O18)
Si DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Si QuartzSiO2
Si SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2O
Si TalcMg3Si4O10(OH)2
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
CaCalcium
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca DolomiteCaMg(CO3)2
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
TiTitanium
Ti RutileTiO2
VVanadium
V MottramitePbCu(VO4)(OH)
FeIron
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe HematiteFe2O3
CuCopper
Cu BrumadoiteCu3(Te6+O4)(OH)4 · 5H2O
Cu MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
Cu MottramitePbCu(VO4)(OH)
Cu ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
AsArsenic
As MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
As Nováčekite-IMg(UO2)2(AsO4)2 · 12H2O
As ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
TeTellurium
Te BrumadoiteCu3(Te6+O4)(OH)4 · 5H2O
PbLead
Pb MottramitePbCu(VO4)(OH)
UUranium
U MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
U Nováčekite-IMg(UO2)2(AsO4)2 · 12H2O
U SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2O
U UraniniteUO2
U ZeuneriteCu(UO2)2(AsO4)2 · 12H2O

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: 3186986
Archean crystalline metamorphic rocks

Age: Archean (2500 - 4000 Ma)

Lithology: Medium-high grade orthogneiss

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]

Neoarchean - Mesoarchean
2500 - 3200 Ma



ID: 2291955
Brumado

Age: Archean (2500 - 3200 Ma)

Lithology: Metabasalt, marble, felsic metavolcanic, chert, metasedimentary, banded iron formation (BIF'S), Metakomatiíto, Formação Manganesífera

Reference: Geological Survey of Brazil. State Geological Maps of Brazil. CPRM - Geobank. [43]

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)
- Cassedanne, J.P. & Cassedanne, J.O. (1978): Famous mineral localities: The Brumado district, Bahia , Brazil. Mineralogical Record 9 : 196-205
- Cassedanne, J.P & Resende, J. P. (1983): Sellaite from the Brumado mine. Mineralogical Record 14 (3): 179-181


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