Municipality of Portalegre district. The municipality has an area of 362.07 km² and 3,180 inhabitants (2023), subdivided into four parishes: Alter do Chão, Chancelaria, Cunheira and Seda. The municipality is bordered to the north by Crato, to the southeast by Monforte, to the south by Fronteira, to the southwest by Avis, and to the west by Ponte de Sor.

Interesting occurrence of riebeckite in Alter Pedroso.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

ⓘ Limestone

Mineral List

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

ⓘ Aegirine

ⓘ Albite

ⓘ Amesite

ⓘ 'Amphibole Supergroup'

ⓘ 'Clinopyroxene Subgroup'

ⓘ Cobaltpentlandite

ⓘ Coulsonite

ⓘ Diopside

ⓘ var. Chromium-bearing Diopside

ⓘ 'Hornblende Root Name Group'

ⓘ Ilmenite

ⓘ Lizardite

ⓘ Magnetite

ⓘ var. Titanium-bearing Magnetite

ⓘ 'Serpentine Subgroup'

41 valid minerals.

Rock Types Recorded

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

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

Select Rock List Type

Alphabetical List Tree Diagram

ⓘ 'Peralkaline syenite'

ⓘ Quartzite

ⓘ Schist

ⓘ Serpentinite

Detailed Mineral List:

ⓘ Aegirine

Formula: NaFe³⁺Si₂O₆

Locality: Alter Pedroso, Alter do Chão, Alter do Chão, Portalegre, Portugal

References:

SERRALHEIRO, António - Esboço geológico da região de Alter Pedroso

Boletim da Sociedade Geológica de Portugal - Vol. XII, fasc. III, (1957-58), p. 3-12, [4 p.]

ⓘ Albite

Formula: Na(AlSi₃O₈)

Locality: Alter Pedroso, Alter do Chão, Alter do Chão, Portalegre, Portugal

References:

Instituto Geológico e Mineiro collection

ⓘ Amesite

Formula: Mg₂Al(AlSiO₅)(OH)₄

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

Rocha, F., Costa, C., & Marques, J. M. (2017). Mineralogical evidence of hydrothermal alteration in Cabeço de Vide mafic–ultramafic complex, Central Portugal. Procedia Earth and Planetary Science, 17, 936-939.

ⓘ 'Amphibole Supergroup'

Formula: AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Analcime

Formula: Na(AlSi₂O₆) · H₂O

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

Dias, P. S. A., Gomes, C. L., Castelo Branco, J. M., & Pinto, Z. (2006). Localização paragenética de paládio e platina em rochas máficas e ultramáficas de Cabeço de Vide–Complexo Ígneo de Alter do Chão.

ⓘ Antigorite

Formula: Mg₃(Si₂O₅)(OH)₄

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Arsenopalladinite

Formula: Pd₈(As,Sb)₃

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Arsenopyrite

Formula: FeAsS

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Auricupride

Formula: Cu₃Au

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Baryte

Formula: BaSO₄

Locality: Horta do Mateus e Zé Calado, Alter do Chão, Alter do Chão, Portalegre, Portugal

References:

LNEG Siorminp ID 1692CuBa

ⓘ 'Biotite'

Formula: K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Brucite

Formula: Mg(OH)₂

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Calcite

Formula: CaCO₃

Localities:

Murtosa quarry, Alter do Chão, Alter do Chão, Portalegre, Portugal
Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

ⓘ Chalcopyrite

Formula: CuFeS₂

Localities:

Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal
Horta do Mateus e Zé Calado, Alter do Chão, Alter do Chão, Portalegre, Portugal

ⓘ 'Chalcopyrrhotite'

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ 'Chlorite Group'

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Chromite

Formula: Fe²⁺Cr³⁺₂O₄

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Chrysotile

Formula: Mg₃(Si₂O₅)(OH)₄

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ 'Clinopyroxene Subgroup'

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Cobaltpentlandite

Formula: Co₉S₈

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Coulsonite

Formula: Fe²⁺V³⁺₂O₄

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Diopside

Formula: CaMgSi₂O₆

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Diopside var. Chromium-bearing Diopside

Formula: Ca(Mg,Cr)Si₂O₆

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Dolomite

Formula: CaMg(CO₃)₂

Localities:

Horta do Mateus e Zé Calado, Alter do Chão, Alter do Chão, Portalegre, Portugal
Carvoeiros, Alter do Chão, Alter do Chão, Portalegre, Portugal

ⓘ Epidote

Formula: (CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)

Locality: Murtosa quarry, Alter do Chão, Alter do Chão, Portalegre, Portugal

References:

Rui Nunes' information 2019

ⓘ 'Feldspar Group'

Localities:

Murtosa quarry, Alter do Chão, Alter do Chão, Portalegre, Portugal
Alter Pedroso, Alter do Chão, Alter do Chão, Portalegre, Portugal

ⓘ Fluorite

Formula: CaF₂

Localities:

Murtosa quarry, Alter do Chão, Alter do Chão, Portalegre, Portugal
Alter Pedroso, Alter do Chão, Alter do Chão, Portalegre, Portugal

ⓘ Franklinite

Formula: Zn²⁺Fe³⁺₂O₄

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Froodite

Formula: α-PdBi₂

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Hercynite

Formula: Fe²⁺Al₂O₄

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ 'Hornblende Root Name Group'

Formula: ◻Ca₂(Z²⁺₄Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

ⓘ Ilmenite

Formula: Fe²⁺TiO₃

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Lizardite

Formula: Mg₃(Si₂O₅)(OH)₄

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

Localities:

Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal
Carvoeiros, Alter do Chão, Alter do Chão, Portalegre, Portugal

ⓘ Magnetite var. Titanium-bearing Magnetite

Formula: Fe²⁺(Fe³⁺,Ti)₂O₄

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Millerite

Formula: NiS

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Muscovite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Muscovite var. Illite

Formula: K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Native Gold

Formula: Au

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ 'Olivine Group'

Formula: M₂SiO₄

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Pentlandite

Formula: (Ni_xFe_y)_Σ9S₈

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ 'Plagioclase'

Formula: (Na,Ca)[(Si,Al)AlSi₂]O₈

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Pyrite

Formula: FeS₂

Localities:

Murtosa quarry, Alter do Chão, Alter do Chão, Portalegre, Portugal
Horta do Mateus e Zé Calado, Alter do Chão, Alter do Chão, Portalegre, Portugal
Carvoeiros, Alter do Chão, Alter do Chão, Portalegre, Portugal

ⓘ Pyrrhotite

Formula: Fe_1-xS

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Quartz

Formula: SiO₂

Localities:

Murtosa quarry, Alter do Chão, Alter do Chão, Portalegre, Portugal
Horta do Mateus e Zé Calado, Alter do Chão, Alter do Chão, Portalegre, Portugal
Alter Pedroso, Alter do Chão, Alter do Chão, Portalegre, Portugal

ⓘ Riebeckite

Formula: ◻[Na₂][Fe²⁺₃Fe³⁺₂]Si₈O₂₂(OH)₂

Locality: Alter Pedroso, Alter do Chão, Alter do Chão, Portalegre, Portugal

References:

Martins da Pedra collection

ⓘ Scarbroite

Formula: Al₅(CO₃)(OH)₁₃ · 5H₂O

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ 'Serpentine Subgroup'

Formula: D₃[Si₂O₅](OH)₄

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Sillimanite

Formula: Al₂(SiO₄)O

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Sperrylite

Formula: PtAs₂

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Sphalerite

Formula: ZnS

Locality: Horta do Mateus e Zé Calado, Alter do Chão, Alter do Chão, Portalegre, Portugal

References:

LNEG Siorminp ID 1692CuBa

ⓘ Stibiopalladinite

Formula: Pd₅Sb₂

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Ulvöspinel

Formula: TiFe²⁺₂O₄

Locality: Cabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal

References:

ⓘ Zircon

Formula: Zr(SiO₄)

Locality: Alter Pedroso, Alter do Chão, Alter do Chão, Portalegre, Portugal

References:

Joseph A. Freilich collection

Gallery:

CaF₂ⓘ Fluorite

Fluorite

Murtosa quarry, Alter do Chão, Alter do Chão, Portalegre, Portugal

Fluorite

Murtosa quarry, Alter do Chão, Alter do Chão, Portalegre, Portugal

Fluorite

Murtosa quarry, Alter do Chão, Alter do Chão, Portalegre, Portugal

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Native Gold	1.AA.05	Au
ⓘ	Auricupride	1.AA.10a	Cu₃Au
Group 2 - Sulphides and Sulfosalts
ⓘ	Arsenopalladinite	2.AC.10c	Pd₈(As,Sb)₃
ⓘ	Stibiopalladinite	2.AC.20a	Pd₅Sb₂
ⓘ	Froodite	2.AC.45a	α-PdBi₂
ⓘ	Cobaltpentlandite	2.BB.15	Co₉S₈
ⓘ	Pentlandite	2.BB.15	(Ni_xFe_y)_Σ9S₈
ⓘ	Sphalerite	2.CB.05a	ZnS
ⓘ	Chalcopyrite	2.CB.10a	CuFeS₂
ⓘ	Pyrrhotite	2.CC.10	Fe_1-xS
ⓘ	Millerite	2.CC.20	NiS
ⓘ	Pyrite	2.EB.05a	FeS₂
ⓘ	Sperrylite	2.EB.05a	PtAs₂
ⓘ	Arsenopyrite	2.EB.20	FeAsS
Group 3 - Halides
ⓘ	Fluorite	3.AB.25	CaF₂
Group 4 - Oxides and Hydroxides
ⓘ	Chromite	4.BB.05	Fe²⁺Cr³⁺₂O₄
ⓘ	Coulsonite	4.BB.05	Fe²⁺V³⁺₂O₄
ⓘ	Franklinite	4.BB.05	Zn²⁺Fe³⁺₂O₄
ⓘ	Hercynite	4.BB.05	Fe²⁺Al₂O₄
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	var. Titanium-bearing Magnetite	4.BB.05	Fe²⁺(Fe³⁺,Ti)₂O₄
ⓘ	Ulvöspinel	4.BB.05	TiFe²⁺₂O₄
ⓘ	Ilmenite	4.CB.05	Fe²⁺TiO₃
ⓘ	Quartz	4.DA.05	SiO₂
ⓘ	Brucite	4.FE.05	Mg(OH)₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Dolomite	5.AB.10	CaMg(CO₃)₂
ⓘ	Scarbroite	5.DA.35	Al₅(CO₃)(OH)₁₃ · 5H₂O
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Baryte	7.AD.35	BaSO₄
Group 9 - Silicates
ⓘ	Chrysotile	9.00.	Mg₃(Si₂O₅)(OH)₄
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Sillimanite	9.AF.05	Al₂(SiO₄)O
ⓘ	Epidote	9.BG.05a	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
ⓘ	Diopside var. Chromium-bearing Diopside	9.DA.15	Ca(Mg,Cr)Si₂O₆
ⓘ		9.DA.15	CaMgSi₂O₆
ⓘ	Aegirine	9.DA.25	NaFe³⁺Si₂O₆
ⓘ	Riebeckite	9.DE.25	◻[Na₂][Fe²⁺₃Fe³⁺₂]Si₈O₂₂(OH)₂
ⓘ	Muscovite var. Illite	9.EC.15	K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂
ⓘ		9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Amesite	9.ED.15	Mg₂Al(AlSiO₅)(OH)₄
ⓘ	Antigorite	9.ED.15	Mg₃(Si₂O₅)(OH)₄
ⓘ	Lizardite	9.ED.15	Mg₃(Si₂O₅)(OH)₄
ⓘ	Albite	9.FA.35	Na(AlSi₃O₈)
ⓘ	Analcime	9.GB.05	Na(AlSi₂O₆) · H₂O
Unclassified
ⓘ	'Amphibole Supergroup'	-	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
ⓘ	'Chlorite Group'	-
ⓘ	'Feldspar Group'	-
ⓘ	'Clinopyroxene Subgroup'	-
ⓘ	'Hornblende Root Name Group'	-	◻Ca₂(Z²⁺₄Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
ⓘ	'Plagioclase'	-	(Na,Ca)[(Si,Al)AlSi₂]O₈
ⓘ	'Serpentine Subgroup'	-	D₃[Si₂O₅](OH)₄
ⓘ	'Olivine Group'	-	M₂SiO₄
ⓘ	'Chalcopyrrhotite'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Amesite	Mg₂Al(AlSiO₅)(OH)₄
H	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
H	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
H	ⓘ Antigorite	Mg₃(Si₂O₅)(OH)₄
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
H	ⓘ Brucite	Mg(OH)₂
H	ⓘ Chrysotile	Mg₃(Si₂O₅)(OH)₄
H	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
H	ⓘ Muscovite var. Illite	K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂
H	ⓘ Lizardite	Mg₃(Si₂O₅)(OH)₄
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
H	ⓘ Scarbroite	Al₅(CO₃)(OH)₁₃ · 5H₂O
H	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
H	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Dolomite	CaMg(CO₃)₂
C	ⓘ Scarbroite	Al₅(CO₃)(OH)₁₃ · 5H₂O
O	Oxygen
O	ⓘ Aegirine	NaFe³⁺Si₂O₆
O	ⓘ Albite	Na(AlSi₃O₈)
O	ⓘ Amesite	Mg₂Al(AlSiO₅)(OH)₄
O	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
O	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
O	ⓘ Antigorite	Mg₃(Si₂O₅)(OH)₄
O	ⓘ Baryte	BaSO₄
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
O	ⓘ Brucite	Mg(OH)₂
O	ⓘ Calcite	CaCO₃
O	ⓘ Chrysotile	Mg₃(Si₂O₅)(OH)₄
O	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
O	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
O	ⓘ Coulsonite	Fe²⁺V₂³⁺O₄
O	ⓘ Diopside	CaMgSi₂O₆
O	ⓘ Dolomite	CaMg(CO₃)₂
O	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
O	ⓘ Franklinite	Zn²⁺Fe₂³⁺O₄
O	ⓘ Hercynite	Fe²⁺Al₂O₄
O	ⓘ Muscovite var. Illite	K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂
O	ⓘ Ilmenite	Fe²⁺TiO₃
O	ⓘ Lizardite	Mg₃(Si₂O₅)(OH)₄
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Quartz	SiO₂
O	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
O	ⓘ Scarbroite	Al₅(CO₃)(OH)₁₃ · 5H₂O
O	ⓘ Sillimanite	Al₂(SiO₄)O
O	ⓘ Magnetite var. Titanium-bearing Magnetite	Fe²⁺(Fe³⁺,Ti)₂O₄
O	ⓘ Ulvöspinel	TiFe₂²⁺O₄
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
O	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
O	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
O	ⓘ Olivine Group	M₂SiO₄
F	Fluorine
F	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
F	ⓘ Fluorite	CaF₂
F	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Na	Sodium
Na	ⓘ Aegirine	NaFe³⁺Si₂O₆
Na	ⓘ Albite	Na(AlSi₃O₈)
Na	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Na	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
Na	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Mg	Magnesium
Mg	ⓘ Amesite	Mg₂Al(AlSiO₅)(OH)₄
Mg	ⓘ Antigorite	Mg₃(Si₂O₅)(OH)₄
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Mg	ⓘ Brucite	Mg(OH)₂
Mg	ⓘ Chrysotile	Mg₃(Si₂O₅)(OH)₄
Mg	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
Mg	ⓘ Diopside	CaMgSi₂O₆
Mg	ⓘ Dolomite	CaMg(CO₃)₂
Mg	ⓘ Lizardite	Mg₃(Si₂O₅)(OH)₄
Al	Aluminium
Al	ⓘ Albite	Na(AlSi₃O₈)
Al	ⓘ Amesite	Mg₂Al(AlSiO₅)(OH)₄
Al	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Al	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Al	ⓘ Hercynite	Fe²⁺Al₂O₄
Al	ⓘ Muscovite var. Illite	K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Scarbroite	Al₅(CO₃)(OH)₁₃ · 5H₂O
Al	ⓘ Sillimanite	Al₂(SiO₄)O
Al	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Al	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	Silicon
Si	ⓘ Aegirine	NaFe³⁺Si₂O₆
Si	ⓘ Albite	Na(AlSi₃O₈)
Si	ⓘ Amesite	Mg₂Al(AlSiO₅)(OH)₄
Si	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Si	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Si	ⓘ Antigorite	Mg₃(Si₂O₅)(OH)₄
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Si	ⓘ Chrysotile	Mg₃(Si₂O₅)(OH)₄
Si	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
Si	ⓘ Diopside	CaMgSi₂O₆
Si	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Si	ⓘ Muscovite var. Illite	K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂
Si	ⓘ Lizardite	Mg₃(Si₂O₅)(OH)₄
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Quartz	SiO₂
Si	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
Si	ⓘ Sillimanite	Al₂(SiO₄)O
Si	ⓘ Zircon	Zr(SiO₄)
Si	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Si	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
Si	ⓘ Olivine Group	M₂SiO₄
S	Sulfur
S	ⓘ Arsenopyrite	FeAsS
S	ⓘ Baryte	BaSO₄
S	ⓘ Chalcopyrite	CuFeS₂
S	ⓘ Cobaltpentlandite	Co₉S₈
S	ⓘ Millerite	NiS
S	ⓘ Pentlandite	(Ni_xFe_y)_Σ9S₈
S	ⓘ Pyrite	FeS₂
S	ⓘ Pyrrhotite	Fe_1-xS
S	ⓘ Sphalerite	ZnS
Cl	Chlorine
Cl	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Cl	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
K	Potassium
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
K	ⓘ Muscovite var. Illite	K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Ca	Calcium
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
Ca	ⓘ Diopside	CaMgSi₂O₆
Ca	ⓘ Dolomite	CaMg(CO₃)₂
Ca	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Ca	ⓘ Fluorite	CaF₂
Ca	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Ca	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Ti	Titanium
Ti	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Ti	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Ti	ⓘ Ilmenite	Fe²⁺TiO₃
Ti	ⓘ Magnetite var. Titanium-bearing Magnetite	Fe²⁺(Fe³⁺,Ti)₂O₄
Ti	ⓘ Ulvöspinel	TiFe₂²⁺O₄
V	Vanadium
V	ⓘ Coulsonite	Fe²⁺V₂³⁺O₄
Cr	Chromium
Cr	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
Cr	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	Iron
Fe	ⓘ Aegirine	NaFe³⁺Si₂O₆
Fe	ⓘ Arsenopyrite	FeAsS
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	ⓘ Chalcopyrite	CuFeS₂
Fe	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	ⓘ Coulsonite	Fe²⁺V₂³⁺O₄
Fe	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Fe	ⓘ Franklinite	Zn²⁺Fe₂³⁺O₄
Fe	ⓘ Hercynite	Fe²⁺Al₂O₄
Fe	ⓘ Ilmenite	Fe²⁺TiO₃
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Pentlandite	(Ni_xFe_y)_Σ9S₈
Fe	ⓘ Pyrite	FeS₂
Fe	ⓘ Pyrrhotite	Fe_1-xS
Fe	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
Fe	ⓘ Magnetite var. Titanium-bearing Magnetite	Fe²⁺(Fe³⁺,Ti)₂O₄
Fe	ⓘ Ulvöspinel	TiFe₂²⁺O₄
Co	Cobalt
Co	ⓘ Cobaltpentlandite	Co₉S₈
Ni	Nickel
Ni	ⓘ Millerite	NiS
Ni	ⓘ Pentlandite	(Ni_xFe_y)_Σ9S₈
Cu	Copper
Cu	ⓘ Auricupride	Cu₃Au
Cu	ⓘ Chalcopyrite	CuFeS₂
Zn	Zinc
Zn	ⓘ Franklinite	Zn²⁺Fe₂³⁺O₄
Zn	ⓘ Sphalerite	ZnS
As	Arsenic
As	ⓘ Arsenopalladinite	Pd₈(As,Sb)₃
As	ⓘ Arsenopyrite	FeAsS
As	ⓘ Sperrylite	PtAs₂
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)
Pd	Palladium
Pd	ⓘ Arsenopalladinite	Pd₈(As,Sb)₃
Pd	ⓘ Froodite	α-PdBi₂
Pd	ⓘ Stibiopalladinite	Pd₅Sb₂
Sb	Antimony
Sb	ⓘ Arsenopalladinite	Pd₈(As,Sb)₃
Sb	ⓘ Stibiopalladinite	Pd₅Sb₂
Ba	Barium
Ba	ⓘ Baryte	BaSO₄
Pt	Platinum
Pt	ⓘ Sperrylite	PtAs₂
Au	Gold
Au	ⓘ Auricupride	Cu₃Au
Au	ⓘ Native Gold	Au
Bi	Bismuth
Bi	ⓘ Froodite	α-PdBi₂

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Wikipedia:	https://en.wikipedia.org/wiki/Alter_do_Ch%C3%A3o
Wikidata ID:	Q438263
GeoNames ID:	6930689

Localities in this Region

Portugal

Portalegre
- Alter do Chão
  - ⭔Alter do Chão
  - Cabeço de Vide ultramafic complex

Other Regions, Features and Areas that Intersect

Eurasian PlateTectonic Plate

Ossa-Morena ZoneVolcanic Arc

Iberian PeninsulaPeninsula

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Alter do Chão, Portalegre, PortugaliRegional Level TypesAlter do ChãoMunicipality PortalegreDistrict PortugalCountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Alter do Chão, Portalegre, Portugal i
Regional Level Types
Alter do Chão Municipality
Portalegre District
Portugal Country