Costa, M. L. D., Alencar, Q. D. S., Gomes, E. R., Almeida, H. D. F. D., & Oliveira, S. K. D. (2016). Textural patterns, mineralogy, and chemistry of sandstone-related Calçadinha chalcedony (Piauí, Brazil). Brazilian Journal of Geology, 46(3), 395-409.

ⓘ Cryptomelane

Formula: K(Mn⁴⁺₇Mn³⁺)O₁₆

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ⓘ Goethite

Formula: α-Fe³⁺O(OH)

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ⓘ Hematite

Formula: Fe₂O₃

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ⓘ Kaolinite

Formula: Al₂(Si₂O₅)(OH)₄

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ⓘ Maghemite

Formula: (Fe³⁺_0.67◻_0.33)Fe³⁺₂O₄

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ⓘ 'Manganese Oxides'

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ⓘ 'Manganese Oxides var. Manganese Dendrites'

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ⓘ Nontronite

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

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ⓘ Opal

Formula: SiO₂ · nH₂O

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ⓘ Opal var. Opal-CT

Formula: SiO₂ · nH₂O

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ⓘ Opal var. Opaline

Formula: SiO₂ · nH₂O

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ⓘ Opal var. White Opal

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ⓘ Palygorskite

Formula: ◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O

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ⓘ Quartz

Formula: SiO₂

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ⓘ Quartz var. Chalcedony

Formula: SiO₂

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ⓘ Quartz var. Milky Quartz

Formula: SiO₂

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ⓘ Quartz var. Quartzine

Formula: SiO₂

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ⓘ 'Smectite Group'

Formula: A_0.3D_2-3[T₄O₁₀]Z₂ · nH₂O

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ⓘ Tridymite

Formula: SiO₂

References:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Goethite	4.00.	α-Fe³⁺O(OH)
ⓘ	Maghemite	4.BB.15	(Fe³⁺_0.67◻_0.33)Fe³⁺₂O₄
ⓘ	Hematite	4.CB.05	Fe₂O₃
ⓘ	Quartz var. Chalcedony	4.DA.05	SiO₂
ⓘ		4.DA.05	SiO₂
ⓘ	var. Milky Quartz	4.DA.05	SiO₂
ⓘ	var. Quartzine	4.DA.05	SiO₂
ⓘ	Opal var. White Opal	4.DA.10	SiO₂ · nH₂O
ⓘ	Tridymite	4.DA.10	SiO₂
ⓘ	Opal var. Opal-CT	4.DA.10	SiO₂ · nH₂O
ⓘ	var. Opaline	4.DA.10	SiO₂ · nH₂O
ⓘ		4.DA.10	SiO₂ · nH₂O
ⓘ	Cristobalite	4.DA.15	SiO₂
ⓘ	Cryptomelane	4.DK.05a	K(Mn⁴⁺₇Mn³⁺)O₁₆
Group 9 - Silicates
ⓘ	Nontronite	9.EC.40	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O
ⓘ	Kaolinite	9.ED.05	Al₂(Si₂O₅)(OH)₄
ⓘ	Palygorskite	9.EE.20	◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O
Unclassified
ⓘ	'Smectite Group'	-	A_0.3D_2-3[T₄O₁₀]Z₂ · nH₂O
ⓘ	'Manganese Oxides var. Manganese Dendrites'	-
ⓘ	''	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Goethite	α-Fe³⁺O(OH)
H	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
H	ⓘ Nontronite	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O
H	ⓘ Opal	SiO₂ · nH₂O
H	ⓘ Opal var. Opaline	SiO₂ · nH₂O
H	ⓘ Palygorskite	◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O
H	ⓘ Smectite Group	A_0.3D_2-3[T₄O₁₀]Z₂ · nH₂O
H	ⓘ Opal var. Opal-CT	SiO₂ · nH₂O
O	Oxygen
O	ⓘ Quartz var. Chalcedony	SiO₂
O	ⓘ Cristobalite	SiO₂
O	ⓘ Cryptomelane	K(Mn₇⁴⁺Mn³⁺)O₁₆
O	ⓘ Goethite	α-Fe³⁺O(OH)
O	ⓘ Hematite	Fe₂O₃
O	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
O	ⓘ Maghemite	(Fe³⁺_0.67◻_0.33)Fe₂³⁺O₄
O	ⓘ Nontronite	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O
O	ⓘ Opal	SiO₂ · nH₂O
O	ⓘ Opal var. Opaline	SiO₂ · nH₂O
O	ⓘ Palygorskite	◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O
O	ⓘ Quartz	SiO₂
O	ⓘ Quartz var. Quartzine	SiO₂
O	ⓘ Tridymite	SiO₂
O	ⓘ Quartz var. Milky Quartz	SiO₂
O	ⓘ Smectite Group	A_0.3D_2-3[T₄O₁₀]Z₂ · nH₂O
O	ⓘ Opal var. Opal-CT	SiO₂ · nH₂O
Na	Sodium
Na	ⓘ Nontronite	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O
Mg	Magnesium
Mg	ⓘ Palygorskite	◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O
Al	Aluminium
Al	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
Al	ⓘ Nontronite	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O
Al	ⓘ Palygorskite	◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O
Si	Silicon
Si	ⓘ Quartz var. Chalcedony	SiO₂
Si	ⓘ Cristobalite	SiO₂
Si	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
Si	ⓘ Nontronite	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O
Si	ⓘ Opal	SiO₂ · nH₂O
Si	ⓘ Opal var. Opaline	SiO₂ · nH₂O
Si	ⓘ Palygorskite	◻Al₂Mg₂◻₂Si₈O₂₀(OH)₂(H₂O)₄ · 4H₂O
Si	ⓘ Quartz	SiO₂
Si	ⓘ Quartz var. Quartzine	SiO₂
Si	ⓘ Tridymite	SiO₂
Si	ⓘ Quartz var. Milky Quartz	SiO₂
Si	ⓘ Opal var. Opal-CT	SiO₂ · nH₂O
K	Potassium
K	ⓘ Cryptomelane	K(Mn₇⁴⁺Mn³⁺)O₁₆
Mn	Manganese
Mn	ⓘ Cryptomelane	K(Mn₇⁴⁺Mn³⁺)O₁₆
Fe	Iron
Fe	ⓘ Goethite	α-Fe³⁺O(OH)
Fe	ⓘ Hematite	Fe₂O₃
Fe	ⓘ Maghemite	(Fe³⁺_0.67◻_0.33)Fe₂³⁺O₄
Fe	ⓘ Nontronite	Na_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂O

Other Regions, Features and Areas containing this locality

South AmericaContinent

South America PlateTectonic Plate

Parnaiba basinBasin

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Calçadinha farm, Nazaré do Piauí, Piauí, BraziliRegional Level TypesCalçadinha farmOutcrop Nazaré do Piauí- not defined - PiauíState BrazilCountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Detailed Mineral List:

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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

Calçadinha farm, Nazaré do Piauí, Piauí, Brazil i
Regional Level Types
Calçadinha farm Outcrop
Nazaré do Piauí - not defined -
Piauí State
Brazil Country