The São João do Piauí deposit is situated in the igneous mafic-ultramafic Brejo Seco–Piauí Complex in the São Francisco craton. The deposit is set within a terrain of intensely deformed volcanic, volcano–sedimentary and sedimentary rocks of Precambrian age that have been intruded by mafic-ultramafic bodies. These mafic-ultramafic bodies are differentiated and comprise serpentinised ultramafics at their base with the upward progression towards troctolites, metagabbros and anorthosites. The entire sequence has been intruded by granitic and granodioritic bodies and is unconformably overlain by sediments of the Sierra Grande Formation, Pimenteiras Formation and Cabeças Formation.

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StandardDetailedGalleryStrunzChemical Elements

Mineral List

ⓘ Asbolane

ⓘ 'Chlorite Group'

ⓘ Chromite

ⓘ var. Aluminian Chromite

ⓘ 'Serpentine Subgroup'

ⓘ Talc

ⓘ Vermiculite

17 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical ListTree Diagram

Detailed Mineral List:

ⓘ Asbolane

Formula:(Ni,Co)_2-xMn⁴⁺(O,OH)₄ · nH₂O

References:

Dybowska, Agnieszka, Paul F. Schofield, Laura Newsome, Richard J. Herrington, Julian F. W. Mosselmans, Burkhard Kaulich, Majid Kazemian, Tohru Araki, Thomas J. Skiggs, Jens Kruger, Anne Oxley, Rachel L. Norman, and Jonathan R. Lloyd. (2022) "Evolution of the Piauí Laterite, Brazil: Mineralogical, Geochemical and Geomicrobiological Mechanisms for Cobalt and Nickel Enrichment" Minerals 12, no. 10: 1298. https://doi.org/10.3390/min12101298

ⓘ 'Chlorite Group'

References:

ⓘ Chromite

Formula:Fe²⁺Cr³⁺₂O₄

References:

ⓘ Chromite var. Aluminian Chromite

Formula:Fe(Cr,Al)₂O₄

References:

ⓘ Chrysotile

Formula:Mg₃(Si₂O₅)(OH)₄

References:

ⓘ 'Ferritchromit'

References:

ⓘ 'Garnierite'

References:

ⓘ Goethite

Formula:Fe³⁺O(OH)

References:

ⓘ Hematite

Formula:Fe₂O₃

References:

ⓘ Ilmenite

Formula:Fe²⁺TiO₃

References:

ⓘ Kaolinite

Formula:Al₂(Si₂O₅)(OH)₄

References:

ⓘ 'Limonite'

References:

ⓘ Lithiophorite

Formula:(Al,Li)MnO₂(OH)₂

References:

ⓘ Lizardite

Formula:Mg₃(Si₂O₅)(OH)₄

References:

ⓘ Maghemite

Formula:(Fe³⁺_0.67◻_0.33)Fe³⁺₂O₄

References:

ⓘ Magnesite

Formula:MgCO₃

References:

ⓘ Magnetite

Formula:Fe²⁺Fe³⁺₂O₄

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ⓘ Nontronite

Formula:Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O

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ⓘ 'Olivine Group'

Formula:M₂SiO₄

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ⓘ 'Pimelite'

Formula:Ni₃Si₄O₁₀(OH)₂ · 4H₂O

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ⓘ Quartz

Formula:SiO₂

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ⓘ Saponite

Formula:Ca_0.25(Mg,Fe)₃((Si,Al)₄O₁₀)(OH)₂ · nH₂O

References:

ⓘ 'Serpentine Subgroup'

Formula:D₃[Si₂O₅](OH)₄

References:

ⓘ Talc

Formula:Mg₃Si₄O₁₀(OH)₂

References:

ⓘ Vermiculite

Formula:Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O

References:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Goethite	4.00.	Fe³⁺O(OH)
ⓘ	Chromite	4.BB.05	Fe²⁺Cr³⁺₂O₄
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Chromite var. Aluminian Chromite	4.BB.05	Fe(Cr,Al)₂O₄
ⓘ	Maghemite	4.BB.15	(Fe³⁺_0.67◻_0.33)Fe³⁺₂O₄
ⓘ	Hematite	4.CB.05	Fe₂O₃
ⓘ	Ilmenite	4.CB.05	Fe²⁺TiO₃
ⓘ	Quartz	4.DA.05	SiO₂
ⓘ	Lithiophorite	4.FE.25	(Al,Li)MnO₂(OH)₂
ⓘ	Asbolane	4.FL.30	(Ni,Co)_2-xMn⁴⁺(O,OH)₄ · nH₂O
Group 5 - Nitrates and Carbonates
ⓘ	Magnesite	5.AB.05	MgCO₃
Group 9 - Silicates
ⓘ	Chrysotile	9.00.	Mg₃(Si₂O₅)(OH)₄
ⓘ	Talc	9.EC.05	Mg₃Si₄O₁₀(OH)₂
ⓘ	'Pimelite'	9.EC.22	Ni₃Si₄O₁₀(OH)₂ · 4H₂O
ⓘ	Nontronite	9.EC.40	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O
ⓘ	Saponite	9.EC.45	Ca_0.25(Mg,Fe)₃((Si,Al)₄O₁₀)(OH)₂ · nH₂O
ⓘ	Vermiculite	9.EC.50	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
ⓘ	Kaolinite	9.ED.05	Al₂(Si₂O₅)(OH)₄
ⓘ	Lizardite	9.ED.15	Mg₃(Si₂O₅)(OH)₄
Unclassified
ⓘ	'Chlorite Group'	-
ⓘ	'Limonite'	-
ⓘ	'Garnierite'	-
ⓘ	'Serpentine Subgroup'	-	D₃[Si₂O₅](OH)₄
ⓘ	'Olivine Group'	-	M₂SiO₄
ⓘ	'Ferritchromit'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Asbolane	(Ni,Co)_2-xMn⁴⁺(O,OH)₄ · nH₂O
H	ⓘ Chrysotile	Mg₃(Si₂O₅)(OH)₄
H	ⓘ Goethite	Fe³⁺O(OH)
H	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
H	ⓘ Lithiophorite	(Al,Li)MnO₂(OH)₂
H	ⓘ Lizardite	Mg₃(Si₂O₅)(OH)₄
H	ⓘ Nontronite	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O
H	ⓘ Saponite	Ca_0.25(Mg,Fe)₃((Si,Al)₄O₁₀)(OH)₂ · nH₂O
H	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
H	ⓘ Vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
H	ⓘ Pimelite	Ni₃Si₄O₁₀(OH)₂ · 4H₂O
H	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
Li	Lithium
Li	ⓘ Lithiophorite	(Al,Li)MnO₂(OH)₂
C	Carbon
C	ⓘ Magnesite	MgCO₃
O	Oxygen
O	ⓘ Asbolane	(Ni,Co)_2-xMn⁴⁺(O,OH)₄ · nH₂O
O	ⓘ Chrysotile	Mg₃(Si₂O₅)(OH)₄
O	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
O	ⓘ Goethite	Fe³⁺O(OH)
O	ⓘ Hematite	Fe₂O₃
O	ⓘ Ilmenite	Fe²⁺TiO₃
O	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
O	ⓘ Lithiophorite	(Al,Li)MnO₂(OH)₂
O	ⓘ Lizardite	Mg₃(Si₂O₅)(OH)₄
O	ⓘ Magnesite	MgCO₃
O	ⓘ Maghemite	(Fe³⁺_0.67◻_0.33)Fe₂³⁺O₄
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Nontronite	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O
O	ⓘ Quartz	SiO₂
O	ⓘ Saponite	Ca_0.25(Mg,Fe)₃((Si,Al)₄O₁₀)(OH)₂ · nH₂O
O	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
O	ⓘ Vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
O	ⓘ Pimelite	Ni₃Si₄O₁₀(OH)₂ · 4H₂O
O	ⓘ Chromite var.Aluminian Chromite	Fe(Cr,Al)₂O₄
O	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
O	ⓘ Olivine Group	M₂SiO₄
Na	Sodium
Na	ⓘ Nontronite	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O
Mg	Magnesium
Mg	ⓘ Chrysotile	Mg₃(Si₂O₅)(OH)₄
Mg	ⓘ Lizardite	Mg₃(Si₂O₅)(OH)₄
Mg	ⓘ Magnesite	MgCO₃
Mg	ⓘ Saponite	Ca_0.25(Mg,Fe)₃((Si,Al)₄O₁₀)(OH)₂ · nH₂O
Mg	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
Mg	ⓘ Vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
Al	Aluminium
Al	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
Al	ⓘ Lithiophorite	(Al,Li)MnO₂(OH)₂
Al	ⓘ Nontronite	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O
Al	ⓘ Saponite	Ca_0.25(Mg,Fe)₃((Si,Al)₄O₁₀)(OH)₂ · nH₂O
Al	ⓘ Vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
Al	ⓘ Chromite var.Aluminian Chromite	Fe(Cr,Al)₂O₄
Si	Silicon
Si	ⓘ Chrysotile	Mg₃(Si₂O₅)(OH)₄
Si	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
Si	ⓘ Lizardite	Mg₃(Si₂O₅)(OH)₄
Si	ⓘ Nontronite	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O
Si	ⓘ Quartz	SiO₂
Si	ⓘ Saponite	Ca_0.25(Mg,Fe)₃((Si,Al)₄O₁₀)(OH)₂ · nH₂O
Si	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
Si	ⓘ Vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
Si	ⓘ Pimelite	Ni₃Si₄O₁₀(OH)₂ · 4H₂O
Si	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
Si	ⓘ Olivine Group	M₂SiO₄
Ca	Calcium
Ca	ⓘ Saponite	Ca_0.25(Mg,Fe)₃((Si,Al)₄O₁₀)(OH)₂ · nH₂O
Ti	Titanium
Ti	ⓘ Ilmenite	Fe²⁺TiO₃
Cr	Chromium
Cr	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Cr	ⓘ Chromite var.Aluminian Chromite	Fe(Cr,Al)₂O₄
Mn	Manganese
Mn	ⓘ Asbolane	(Ni,Co)_2-xMn⁴⁺(O,OH)₄ · nH₂O
Mn	ⓘ Lithiophorite	(Al,Li)MnO₂(OH)₂
Fe	Iron
Fe	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	ⓘ Goethite	Fe³⁺O(OH)
Fe	ⓘ Hematite	Fe₂O₃
Fe	ⓘ Ilmenite	Fe²⁺TiO₃
Fe	ⓘ Maghemite	(Fe³⁺_0.67◻_0.33)Fe₂³⁺O₄
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Nontronite	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O
Fe	ⓘ Saponite	Ca_0.25(Mg,Fe)₃((Si,Al)₄O₁₀)(OH)₂ · nH₂O
Fe	ⓘ Vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
Fe	ⓘ Chromite var.Aluminian Chromite	Fe(Cr,Al)₂O₄
Co	Cobalt
Co	ⓘ Asbolane	(Ni,Co)_2-xMn⁴⁺(O,OH)₄ · nH₂O
Ni	Nickel
Ni	ⓘ Asbolane	(Ni,Co)_2-xMn⁴⁺(O,OH)₄ · nH₂O
Ni	ⓘ Pimelite	Ni₃Si₄O₁₀(OH)₂ · 4H₂O

Other Regions, Features and Areas containing this locality

South AmericaContinent

South America PlateTectonic Plate

Borborema ProvinceShield

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References

[1]Dybowska, Agnieszka, Paul F. Schofield, Laura Newsome, Richard J. Herrington, Julian F. W. Mosselmans, Burkhard Kaulich, Majid Kazemian, Tohru Araki, Thomas J. Skiggs, Jens Kruger, Anne Oxley, Rachel L. Norman, and Jonathan R. Lloyd. (2022) "Evolution of the Piauí Laterite, Brazil: Mineralogical, Geochemical and Geomicrobiological Mechanisms for Cobalt and Nickel Enrichment" Minerals 12, no. 10: 1298. https://doi.org/10.3390/min12101298

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São João do Piauí deposit, Capitão Gervásio de Oliveira, Piauí, BraziliRegional Level TypesSão João do Piauí depositDeposit Capitão Gervásio de OliveiraMunicipality PiauíState BrazilCountry

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Mineral List

Rock Types Recorded

Select Rock List Type

Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Other Regions, Features and Areas containing this locality

References

São João do Piauí deposit, Capitão Gervásio de Oliveira, Piauí, Brazil i
Regional Level Types
São João do Piauí deposit Deposit
Capitão Gervásio de Oliveira Municipality
Piauí State
Brazil Country