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Caldeira-Castelinho Ignimbrite Formation, Angra do HeroΓ­smo, Terceira, Azores, Portugali
Regional Level Types
Caldeira-Castelinho Ignimbrite FormationFormation
Angra do HeroΓ­smoMunicipality
TerceiraIsland
AzoresAutonomous Region
PortugalCountry

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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
KΓΆppen 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:

β“˜ Aegirine-augite
Formula: (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
β“˜ Aenigmatite
Formula: Na4[Fe2+10Ti2]O4[Si12O36]
β“˜ Albite
Formula: Na(AlSi3O8)
β“˜ Albite var. Anorthoclase
Formula: (Na,K)AlSi3O8
β“˜ 'Alkali Feldspar'
β“˜ 'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
β“˜ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
β“˜ Dalyite
Formula: K2ZrSi6O15
β“˜ '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)
β“˜ Fayalite
Formula: Fe2+2SiO4
β“˜ 'Fayalite-Forsterite Series'
β“˜ Ferro-edenite
Formula: NaCa2Fe2+5(Si7Al)O22(OH)2
β“˜ Ilmenite
Formula: Fe2+TiO3
β“˜ Katophorite
Formula: {Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2
β“˜ Magnetite
Formula: Fe2+Fe3+2O4
β“˜ Magnetite var. Titanium-bearing Magnetite
Formula: Fe2+(Fe3+,Ti)2O4
β“˜ 'Pyroxene Group'
Formula: ADSi2O6
β“˜ Quartz
Formula: SiO2
β“˜ 'Sodium Amphibole Subgroup'
Formula: An(Na2)(Z5)(Si8-mAlmO22)(OH,F,Cl)2
β“˜ 'Sodium-Calcium Amphibole Subgroup'
Formula: An(NaCa)(Z2+5-mZ3+m)(Si8-(n+m+1)Al(n+m-1)O22)(OH,F,Cl)2

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
β“˜Magnetite4.BB.05Fe2+Fe3+2O4
β“˜var. Titanium-bearing Magnetite4.BB.05Fe2+(Fe3+,Ti)2O4
β“˜Ilmenite4.CB.05Fe2+TiO3
β“˜Quartz4.DA.05SiO2
Group 9 - Silicates
β“˜Fayalite9.AC.05Fe2+2SiO4
β“˜Aegirine-augite9.DA.20(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
β“˜Ferro-edenite9.DE.15NaCa2Fe2+5(Si7Al)O22(OH)2
β“˜Katophorite9.DE.20{Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2
β“˜Aenigmatite9.DH.40Na4[Fe2+10Ti2]O4[Si12O36]
β“˜Dalyite9.EA.25K2ZrSi6O15
β“˜Albite
var. Anorthoclase		9.FA.35(Na,K)AlSi3O8
β“˜9.FA.35Na(AlSi3O8)
Unclassified
β“˜'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
β“˜'Alkali Feldspar'-
β“˜'Fayalite-Forsterite Series'-
β“˜'Pyroxene Group'-ADSi2O6
β“˜'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)
β“˜'Apatite'-Ca5(PO4)3(Cl/F/OH)
β“˜'Sodium Amphibole Subgroup'-An(Na2)(Z5)(Si8-mAlmO22)(OH,F,Cl)2
β“˜'Sodium-Calcium Amphibole Subgroup'-An(NaCa)(Z2+5-mZ3+m)(Si8-(n+m+1)Al(n+m-1)O22)(OH,F,Cl)2

List of minerals for each chemical element

HHydrogen
Hβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
Hβ“˜ Katophorite{Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2
Hβ“˜ ApatiteCa5(PO4)3(Cl/F/OH)
Hβ“˜ Sodium Amphibole SubgroupAn(Na2)(Z5)(Si8-mAlmO22)(OH,F,Cl)2
Hβ“˜ Sodium-Calcium Amphibole SubgroupAn(NaCa)(Z2+5-mZm3+)(Si8-(n+m+1)Al(n+m-1)O22)(OH,F,Cl)2
OOxygen
Oβ“˜ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Oβ“˜ AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Oβ“˜ AlbiteNa(AlSi3O8)
Oβ“˜ Albite var. Anorthoclase(Na,K)AlSi3O8
Oβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oβ“˜ DalyiteK2ZrSi6O15
Oβ“˜ FayaliteFe22+SiO4
Oβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
Oβ“˜ IlmeniteFe2+TiO3
Oβ“˜ MagnetiteFe2+Fe23+O4
Oβ“˜ QuartzSiO2
Oβ“˜ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
Oβ“˜ Katophorite{Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2
Oβ“˜ Pyroxene GroupADSi2O6
Oβ“˜ 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)
Oβ“˜ ApatiteCa5(PO4)3(Cl/F/OH)
Oβ“˜ Sodium Amphibole SubgroupAn(Na2)(Z5)(Si8-mAlmO22)(OH,F,Cl)2
Oβ“˜ Sodium-Calcium Amphibole SubgroupAn(NaCa)(Z2+5-mZm3+)(Si8-(n+m+1)Al(n+m-1)O22)(OH,F,Cl)2
FFluorine
Fβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fβ“˜ ApatiteCa5(PO4)3(Cl/F/OH)
Fβ“˜ Sodium Amphibole SubgroupAn(Na2)(Z5)(Si8-mAlmO22)(OH,F,Cl)2
Fβ“˜ Sodium-Calcium Amphibole SubgroupAn(NaCa)(Z2+5-mZm3+)(Si8-(n+m+1)Al(n+m-1)O22)(OH,F,Cl)2
NaSodium
Naβ“˜ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Naβ“˜ AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Naβ“˜ AlbiteNa(AlSi3O8)
Naβ“˜ Albite var. Anorthoclase(Na,K)AlSi3O8
Naβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
Naβ“˜ Katophorite{Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2
Naβ“˜ Sodium Amphibole SubgroupAn(Na2)(Z5)(Si8-mAlmO22)(OH,F,Cl)2
Naβ“˜ Sodium-Calcium Amphibole SubgroupAn(NaCa)(Z2+5-mZm3+)(Si8-(n+m+1)Al(n+m-1)O22)(OH,F,Cl)2
MgMagnesium
Mgβ“˜ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Mgβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgβ“˜ Katophorite{Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2
AlAluminium
Alβ“˜ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Alβ“˜ AlbiteNa(AlSi3O8)
Alβ“˜ Albite var. Anorthoclase(Na,K)AlSi3O8
Alβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
Alβ“˜ Katophorite{Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2
Alβ“˜ Sodium Amphibole SubgroupAn(Na2)(Z5)(Si8-mAlmO22)(OH,F,Cl)2
Alβ“˜ Sodium-Calcium Amphibole SubgroupAn(NaCa)(Z2+5-mZm3+)(Si8-(n+m+1)Al(n+m-1)O22)(OH,F,Cl)2
SiSilicon
Siβ“˜ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Siβ“˜ AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Siβ“˜ AlbiteNa(AlSi3O8)
Siβ“˜ Albite var. Anorthoclase(Na,K)AlSi3O8
Siβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siβ“˜ DalyiteK2ZrSi6O15
Siβ“˜ FayaliteFe22+SiO4
Siβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
Siβ“˜ QuartzSiO2
Siβ“˜ Katophorite{Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2
Siβ“˜ Pyroxene GroupADSi2O6
Siβ“˜ 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)
Siβ“˜ Sodium Amphibole SubgroupAn(Na2)(Z5)(Si8-mAlmO22)(OH,F,Cl)2
Siβ“˜ Sodium-Calcium Amphibole SubgroupAn(NaCa)(Z2+5-mZm3+)(Si8-(n+m+1)Al(n+m-1)O22)(OH,F,Cl)2
PPhosphorus
Pβ“˜ ApatiteCa5(PO4)3(Cl/F/OH)
ClChlorine
Clβ“˜ ApatiteCa5(PO4)3(Cl/F/OH)
Clβ“˜ Sodium Amphibole SubgroupAn(Na2)(Z5)(Si8-mAlmO22)(OH,F,Cl)2
Clβ“˜ Sodium-Calcium Amphibole SubgroupAn(NaCa)(Z2+5-mZm3+)(Si8-(n+m+1)Al(n+m-1)O22)(OH,F,Cl)2
KPotassium
Kβ“˜ Albite var. Anorthoclase(Na,K)AlSi3O8
Kβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kβ“˜ DalyiteK2ZrSi6O15
CaCalcium
Caβ“˜ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Caβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
Caβ“˜ Katophorite{Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2
Caβ“˜ ApatiteCa5(PO4)3(Cl/F/OH)
Caβ“˜ Sodium-Calcium Amphibole SubgroupAn(NaCa)(Z2+5-mZm3+)(Si8-(n+m+1)Al(n+m-1)O22)(OH,F,Cl)2
TiTitanium
Tiβ“˜ AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Tiβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Tiβ“˜ IlmeniteFe2+TiO3
Tiβ“˜ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
FeIron
Feβ“˜ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Feβ“˜ AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Feβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feβ“˜ FayaliteFe22+SiO4
Feβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
Feβ“˜ IlmeniteFe2+TiO3
Feβ“˜ MagnetiteFe2+Fe23+O4
Feβ“˜ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
ZrZirconium
Zrβ“˜ DalyiteK2ZrSi6O15

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This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

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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