Caldeira-Castelinho Ignimbrite Formation, Angra do Heroísmo, Terceira, Azores, Portugal i
Regional Level Types
Caldeira-Castelinho Ignimbrite Formation Formation
Angra do Heroísmo Municipality
Terceira Island
Azores Autonomous Region
Portugal Country

Regional Level Types
Caldeira-Castelinho Ignimbrite Formation	Formation
Angra do Heroísmo	Municipality
Terceira	Island
Azores	Autonomous Region
Portugal	Country

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Latitude & Longitude (WGS84):

38° North , 27° West (est.)

Estimate based on other nearby localities or region boundaries.

Margin of Error:

~17km

GRN:

N26W16

Type:

Formation

Köppen climate type:

Csb : Warm-summer Mediterranean climate

Mindat Locality ID:

270873

Long-form identifier:

mindat:1:2:270873:0

GUID (UUID V4):

dddfbb28-0b12-4506-ab99-de3dc7b680ca

Name(s) in local language(s):

Ignimbrito da Caldeira-Castelinho, Angra do Heroísmo, Ilha da Terceira, Açores, Portugal

The Caldeira-Castelinho Ignimbrite Formation is one of at least seven ignimbrite formations found within the stratigraphy of Terceira Island and can be readily distinguished from its counterparts by its relative abundance of quartz syenite ejecta (Gertisser et al., 2010).

Mineral assemblages of the Caldeira-Castelinho Ignimbrite Formation syenite ejecta include alkali-feldspar, Na pyroxene, Na-Ca to Na amphibole, quartz, aenigmatite, and fayalite with accessory Ti-rich magnetite, ilmenite, apatite, dalyite, an unspecified eudialyte group phase, and biotite.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

10 valid minerals.

Detailed Mineral List:

ⓘ Aegirine-augite

Formula: (Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆

References:

www.minersoc.org (n.d.) http://www.minersoc.org/files/Applied_Mineralogist_AMG_bulletin_Volume1_Number3.pdf

ⓘ Aenigmatite

Formula: Na₄[Fe²⁺₁₀Ti₂]O₄[Si₁₂O₃₆]

References:

Jeffery, A.J., Gertisser, R., Jackson, R.A., O'Driscoll, B., Kronz, A. (2016): PREPUBLICATION: On the compositional variability of dalyite, K2ZrSi6O15: a new occurrence from Terceira, Azores. Mineralogical Magazine, Prepublication, 39 pp. (available on line since January 1, 2016).

ⓘ Albite

Formula: Na(AlSi₃O₈)

References:

www.minersoc.org (n.d.) http://www.minersoc.org/files/Applied_Mineralogist_AMG_bulletin_Volume1_Number3.pdf

ⓘ Albite var. Anorthoclase

Formula: (Na,K)AlSi₃O₈

References:

www.minersoc.org (n.d.) http://www.minersoc.org/files/Applied_Mineralogist_AMG_bulletin_Volume1_Number3.pdf

ⓘ 'Alkali Feldspar'

References:

ⓘ 'Apatite'

Formula: Ca₅(PO₄)₃(Cl/F/OH)

References:

ⓘ 'Biotite'

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

References:

ⓘ Dalyite

Formula: K₂ZrSi₆O₁₅

References:

Jeffery, A.J., Gertisser, R., Jackson, R.A., O'Driscoll, B., Kronz, A. (2016): On the compositional variability of dalyite, K2ZrSi6O15: a new occurrence from Terceira, Azores. Mineralogical Magazine, 80, 547-565.

ⓘ 'Eudialyte Group'

Formula: [N(1)N(2)N(3)N(4)N(5)]₃[M(1.1)M(1.2)]₃[M(2.1)M(2.2)M(2.3)]_3-6[M(3)M(4)]Z₃[Si₂₄O₇₂]Θ₄X(1)X(2)

References:

ⓘ Fayalite

Formula: Fe²⁺₂SiO₄

References:

ⓘ 'Fayalite-Forsterite Series'

References:

www.minersoc.org (n.d.) http://www.minersoc.org/files/Applied_Mineralogist_AMG_bulletin_Volume1_Number3.pdf

ⓘ Ferro-edenite

Formula: NaCa₂Fe²⁺₅(Si₇Al)O₂₂(OH)₂

References:

www.minersoc.org (n.d.) http://www.minersoc.org/files/Applied_Mineralogist_AMG_bulletin_Volume1_Number3.pdf

ⓘ Ilmenite

Formula: Fe²⁺TiO₃

References:

ⓘ Katophorite

Formula: {Na}{CaNa}{Mg₄Al}[(AlSi₇)O₂₂](OH)₂

References:

www.minersoc.org (n.d.) http://www.minersoc.org/files/Applied_Mineralogist_AMG_bulletin_Volume1_Number3.pdf

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

ⓘ Magnetite var. Titanium-bearing Magnetite

Formula: Fe²⁺(Fe³⁺,Ti)₂O₄

References:

ⓘ 'Pyroxene Group'

Formula: ADSi₂O₆

References:

ⓘ Quartz

Formula: SiO₂

References:

ⓘ 'Sodium Amphibole Subgroup'

Formula: A_n(Na₂)(Z₅)(Si_8-mAl_mO₂₂)(OH,F,Cl)₂

References:

ⓘ 'Sodium-Calcium Amphibole Subgroup'

Formula: A_n(NaCa)(Z²⁺_5-mZ³⁺_m)(Si_8-(n+m+1)Al_(n+m-1)O₂₂)(OH,F,Cl)₂

References:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	var. Titanium-bearing Magnetite	4.BB.05	Fe²⁺(Fe³⁺,Ti)₂O₄
ⓘ	Ilmenite	4.CB.05	Fe²⁺TiO₃
ⓘ	Quartz	4.DA.05	SiO₂
Group 9 - Silicates
ⓘ	Fayalite	9.AC.05	Fe²⁺₂SiO₄
ⓘ	Aegirine-augite	9.DA.20	(Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆
ⓘ	Ferro-edenite	9.DE.15	NaCa₂Fe²⁺₅(Si₇Al)O₂₂(OH)₂
ⓘ	Katophorite	9.DE.20	{Na}{CaNa}{Mg₄Al}[(AlSi₇)O₂₂](OH)₂
ⓘ	Aenigmatite	9.DH.40	Na₄[Fe²⁺₁₀Ti₂]O₄[Si₁₂O₃₆]
ⓘ	Dalyite	9.EA.25	K₂ZrSi₆O₁₅
ⓘ	Albite var. Anorthoclase	9.FA.35	(Na,K)AlSi₃O₈
ⓘ		9.FA.35	Na(AlSi₃O₈)
Unclassified
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
ⓘ	'Alkali Feldspar'	-
ⓘ	'Fayalite-Forsterite Series'	-
ⓘ	'Pyroxene Group'	-	ADSi₂O₆
ⓘ	'Eudialyte Group'	-	[N(1)N(2)N(3)N(4)N(5)]₃[M(1.1)M(1.2)]₃[M(2.1)M(2.2)M(2.3)]_3-6[M(3)M(4)]Z₃[Si₂₄O₇₂]Θ₄X(1)X(2)
ⓘ	'Apatite'	-	Ca₅(PO₄)₃(Cl/F/OH)
ⓘ	'Sodium Amphibole Subgroup'	-	A_n(Na₂)(Z₅)(Si_8-mAl_mO₂₂)(OH,F,Cl)₂
ⓘ	'Sodium-Calcium Amphibole Subgroup'	-	A_n(NaCa)(Z²⁺_5-mZ³⁺_m)(Si_8-(n+m+1)Al_(n+m-1)O₂₂)(OH,F,Cl)₂

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
H	ⓘ Ferro-edenite	NaCa₂Fe₅²⁺(Si₇Al)O₂₂(OH)₂
H	ⓘ Katophorite	{Na}{CaNa}{Mg₄Al}[(AlSi₇)O₂₂](OH)₂
H	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
H	ⓘ Sodium Amphibole Subgroup	A_n(Na₂)(Z₅)(Si_8-mAl_mO₂₂)(OH,F,Cl)₂
H	ⓘ Sodium-Calcium Amphibole Subgroup	A_n(NaCa)(Z²⁺_5-mZ_m³⁺)(Si_8-(n+m+1)Al_(n+m-1)O₂₂)(OH,F,Cl)₂
O	Oxygen
O	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
O	ⓘ Aenigmatite	Na₄[Fe₁₀²⁺Ti₂]O₄[Si₁₂O₃₆]
O	ⓘ Albite	Na(AlSi₃O₈)
O	ⓘ Albite var. Anorthoclase	(Na,K)AlSi₃O₈
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
O	ⓘ Dalyite	K₂ZrSi₆O₁₅
O	ⓘ Fayalite	Fe₂²⁺SiO₄
O	ⓘ Ferro-edenite	NaCa₂Fe₅²⁺(Si₇Al)O₂₂(OH)₂
O	ⓘ Ilmenite	Fe²⁺TiO₃
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Quartz	SiO₂
O	ⓘ Magnetite var. Titanium-bearing Magnetite	Fe²⁺(Fe³⁺,Ti)₂O₄
O	ⓘ Katophorite	{Na}{CaNa}{Mg₄Al}[(AlSi₇)O₂₂](OH)₂
O	ⓘ Pyroxene Group	ADSi₂O₆
O	ⓘ Eudialyte Group	[N(1)N(2)N(3)N(4)N(5)]₃[M(1.1)M(1.2)]₃[M(2.1)M(2.2)M(2.3)]_3-6[M(3)M(4)]Z₃[Si₂₄O₇₂]Θ₄X(1)X(2)
O	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
O	ⓘ Sodium Amphibole Subgroup	A_n(Na₂)(Z₅)(Si_8-mAl_mO₂₂)(OH,F,Cl)₂
O	ⓘ Sodium-Calcium Amphibole Subgroup	A_n(NaCa)(Z²⁺_5-mZ_m³⁺)(Si_8-(n+m+1)Al_(n+m-1)O₂₂)(OH,F,Cl)₂
F	Fluorine
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
F	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
F	ⓘ Sodium Amphibole Subgroup	A_n(Na₂)(Z₅)(Si_8-mAl_mO₂₂)(OH,F,Cl)₂
F	ⓘ Sodium-Calcium Amphibole Subgroup	A_n(NaCa)(Z²⁺_5-mZ_m³⁺)(Si_8-(n+m+1)Al_(n+m-1)O₂₂)(OH,F,Cl)₂
Na	Sodium
Na	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Na	ⓘ Aenigmatite	Na₄[Fe₁₀²⁺Ti₂]O₄[Si₁₂O₃₆]
Na	ⓘ Albite	Na(AlSi₃O₈)
Na	ⓘ Albite var. Anorthoclase	(Na,K)AlSi₃O₈
Na	ⓘ Ferro-edenite	NaCa₂Fe₅²⁺(Si₇Al)O₂₂(OH)₂
Na	ⓘ Katophorite	{Na}{CaNa}{Mg₄Al}[(AlSi₇)O₂₂](OH)₂
Na	ⓘ Sodium Amphibole Subgroup	A_n(Na₂)(Z₅)(Si_8-mAl_mO₂₂)(OH,F,Cl)₂
Na	ⓘ Sodium-Calcium Amphibole Subgroup	A_n(NaCa)(Z²⁺_5-mZ_m³⁺)(Si_8-(n+m+1)Al_(n+m-1)O₂₂)(OH,F,Cl)₂
Mg	Magnesium
Mg	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Mg	ⓘ Katophorite	{Na}{CaNa}{Mg₄Al}[(AlSi₇)O₂₂](OH)₂
Al	Aluminium
Al	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Al	ⓘ Albite	Na(AlSi₃O₈)
Al	ⓘ Albite var. Anorthoclase	(Na,K)AlSi₃O₈
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	ⓘ Ferro-edenite	NaCa₂Fe₅²⁺(Si₇Al)O₂₂(OH)₂
Al	ⓘ Katophorite	{Na}{CaNa}{Mg₄Al}[(AlSi₇)O₂₂](OH)₂
Al	ⓘ Sodium Amphibole Subgroup	A_n(Na₂)(Z₅)(Si_8-mAl_mO₂₂)(OH,F,Cl)₂
Al	ⓘ Sodium-Calcium Amphibole Subgroup	A_n(NaCa)(Z²⁺_5-mZ_m³⁺)(Si_8-(n+m+1)Al_(n+m-1)O₂₂)(OH,F,Cl)₂
Si	Silicon
Si	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Si	ⓘ Aenigmatite	Na₄[Fe₁₀²⁺Ti₂]O₄[Si₁₂O₃₆]
Si	ⓘ Albite	Na(AlSi₃O₈)
Si	ⓘ Albite var. Anorthoclase	(Na,K)AlSi₃O₈
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Si	ⓘ Dalyite	K₂ZrSi₆O₁₅
Si	ⓘ Fayalite	Fe₂²⁺SiO₄
Si	ⓘ Ferro-edenite	NaCa₂Fe₅²⁺(Si₇Al)O₂₂(OH)₂
Si	ⓘ Quartz	SiO₂
Si	ⓘ Katophorite	{Na}{CaNa}{Mg₄Al}[(AlSi₇)O₂₂](OH)₂
Si	ⓘ Pyroxene Group	ADSi₂O₆
Si	ⓘ Eudialyte Group	[N(1)N(2)N(3)N(4)N(5)]₃[M(1.1)M(1.2)]₃[M(2.1)M(2.2)M(2.3)]_3-6[M(3)M(4)]Z₃[Si₂₄O₇₂]Θ₄X(1)X(2)
Si	ⓘ Sodium Amphibole Subgroup	A_n(Na₂)(Z₅)(Si_8-mAl_mO₂₂)(OH,F,Cl)₂
Si	ⓘ Sodium-Calcium Amphibole Subgroup	A_n(NaCa)(Z²⁺_5-mZ_m³⁺)(Si_8-(n+m+1)Al_(n+m-1)O₂₂)(OH,F,Cl)₂
P	Phosphorus
P	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Cl	Chlorine
Cl	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Cl	ⓘ Sodium Amphibole Subgroup	A_n(Na₂)(Z₅)(Si_8-mAl_mO₂₂)(OH,F,Cl)₂
Cl	ⓘ Sodium-Calcium Amphibole Subgroup	A_n(NaCa)(Z²⁺_5-mZ_m³⁺)(Si_8-(n+m+1)Al_(n+m-1)O₂₂)(OH,F,Cl)₂
K	Potassium
K	ⓘ Albite var. Anorthoclase	(Na,K)AlSi₃O₈
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
K	ⓘ Dalyite	K₂ZrSi₆O₁₅
Ca	Calcium
Ca	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Ca	ⓘ Ferro-edenite	NaCa₂Fe₅²⁺(Si₇Al)O₂₂(OH)₂
Ca	ⓘ Katophorite	{Na}{CaNa}{Mg₄Al}[(AlSi₇)O₂₂](OH)₂
Ca	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ca	ⓘ Sodium-Calcium Amphibole Subgroup	A_n(NaCa)(Z²⁺_5-mZ_m³⁺)(Si_8-(n+m+1)Al_(n+m-1)O₂₂)(OH,F,Cl)₂
Ti	Titanium
Ti	ⓘ Aenigmatite	Na₄[Fe₁₀²⁺Ti₂]O₄[Si₁₂O₃₆]
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
Fe	Iron
Fe	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Fe	ⓘ Aenigmatite	Na₄[Fe₁₀²⁺Ti₂]O₄[Si₁₂O₃₆]
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	ⓘ Fayalite	Fe₂²⁺SiO₄
Fe	ⓘ Ferro-edenite	NaCa₂Fe₅²⁺(Si₇Al)O₂₂(OH)₂
Fe	ⓘ Ilmenite	Fe²⁺TiO₃
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Magnetite var. Titanium-bearing Magnetite	Fe²⁺(Fe³⁺,Ti)₂O₄
Zr	Zirconium
Zr	ⓘ Dalyite	K₂ZrSi₆O₁₅

Other Regions, Features and Areas containing this locality

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References

Gertisser, R., Self, S., Gaspar, J.L., Kelley, S.P., Pimentel, A., Eikenberg, J., Barry, T.L., Pacheco, J.M., Queiroz, G., Vespa, M. (2010) Ignimbrite stratigraphy and chronology on Terceira Island, Azores. The Geological Society of America, Special Paper 464: 133-154.

Jeffery, A.J., Gertisser, R., Jackson, R.A., O'Driscoll, B., Kronz, A. (2016) On the compositional variability of dalyite, K2ZrSi6O15: a new occurrence from Terceira, Azores. Mineralogical Magazine: 80: 547-565.

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