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Poggio Pinzo, Gradoli, Làtera volcano, Viterbo Province, Lazio, Italyi
Regional Level Types
Poggio Pinzo- not defined -
Gradoli- not defined -
Làtera volcanoVolcano
Viterbo ProvinceProvince
LazioAdministrative Region
ItalyCountry

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Key
Latitude & Longitude (WGS84):
42° 38' 16'' North , 11° 49' 58'' East
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Latera806 (2014)1.0km
Gradoli1,305 (2014)2.0km
Il Casone130 (2014)5.1km
Grotte di Castro2,560 (2014)5.2km
Onano864 (2014)6.1km
Name(s) in local language(s):
Poggio Pinzo, Gradoli, Làtera volcano, Viterbo, Lazio, Italia


Known among the Italian collectors as the "Gradoli pozzolana quarry", it is opened in the so-called "Tufi di Poggio Pinzo", a stratigraphic sequence mainly consisting of strombolian fall deposits ranging in size from ash to black scoriaceous lapilli and whitish pumices, and of hydromagmatic fall and surge deposits constituted by vescicular tuffs, fine- and coarse-grained tuffs with sandwave structures. The chemical composition varies from tephrite at the base of the stratigraphic sequence to phonolitic trachyte at its top.

Regions containing this locality

Eurasian PlateTectonic Plate
EuropeContinent

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


24 valid minerals.

Detailed Mineral List:

Afghanite
Formula: (Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
'Amphibole Supergroup'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Analcime
Formula: Na(AlSi2O6) · H2O
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Andradite
Formula: Ca3Fe3+2(SiO4)3
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Andradite var: Melanite
Formula: Ca3Fe3+2(SiO4)3
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Anorthite
Formula: Ca(Al2Si2O8)
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Baddeleyite
Formula: ZrO2
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Calcite
Formula: CaCO3
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
'Cancrinite Group'
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
'Chabazite'
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Cuspidine
Formula: Ca4(Si2O7)(F,OH)2
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Grossular
Formula: Ca3Al2(SiO4)3
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Gypsum
Formula: CaSO4 · 2H2O
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Haüyne
Formula: (Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Hematite
Formula: Fe2O3
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Ilmenite
Formula: Fe2+TiO3
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Latiumite
Formula: (Ca,K)4(Si,Al)5O11(SO4,CO3)
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Magnetite
Formula: Fe2+Fe3+2O4
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
'Melilite Group'
Formula: Ca2M(XSiO7)
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
'Phillipsite'
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
'Pyroxene Group'
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Quartz
Formula: SiO2
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Sanidine
Formula: K(AlSi3O8)
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Sodalite
Formula: Na8(Al6Si6O24)Cl2
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Spinel
Formula: MgAl2O4
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
'Thomsonite'
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Titanite
Formula: CaTi(SiO4)O
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Tuscanite
Formula: (K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Vonsenite
Formula: Fe2+2Fe3+(BO3)O2
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Wollastonite
Formula: CaSiO3
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
Zircon
Formula: Zr(SiO4)
Reference: - Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Baddeleyite4.DE.35ZrO2
Hematite4.CB.05Fe2O3
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Spinel4.BB.05MgAl2O4
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 6 - Borates
Vonsenite6.AB.30Fe2+2Fe3+(BO3)O2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Gypsum7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
Afghanite9.FB.05(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6
Analcime9.GB.05Na(AlSi2O6) · H2O
Andradite9.AD.25Ca3Fe3+2(SiO4)3
var: Melanite9.AD.25Ca3Fe3+2(SiO4)3
Anorthite9.FA.35Ca(Al2Si2O8)
Cuspidine9.BE.17Ca4(Si2O7)(F,OH)2
Grossular9.AD.25Ca3Al2(SiO4)3
Haüyne9.FB.10(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Latiumite9.EG.45(Ca,K)4(Si,Al)5O11(SO4,CO3)
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Sanidine9.FA.30K(AlSi3O8)
Sodalite9.FB.10Na8(Al6Si6O24)Cl2
Titanite9.AG.15CaTi(SiO4)O
Tuscanite9.EG.45(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
Wollastonite9.DG.05CaSiO3
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Cancrinite Group'-
'Chabazite'-
'Melilite Group'-Ca2M(XSiO7)
'Phillipsite'-
'Pyroxene Group'-
'Thomsonite'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Baddeleyite4.4.14.1ZrO2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Spinel7.2.1.1MgAl2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 24 - ANHYDROUS BORATES
A2BO2[XO3]
Vonsenite24.2.1.2Fe2+2Fe3+(BO3)O2
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Andradite51.4.3b.1Ca3Fe3+2(SiO4)3
Grossular51.4.3b.2Ca3Al2(SiO4)3
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 56 - SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
Cuspidine56.2.4.3Ca4(Si2O7)(F,OH)2
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=3
Wollastonite65.2.1.1cCaSiO3
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Group 73 - PHYLLOSILICATES Condensed Tetrahedral Sheets
Condensed Tetrahedral Sheets with double layers
Latiumite73.1.2.1(Ca,K)4(Si,Al)5O11(SO4,CO3)
Tuscanite73.1.2.2(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Sanidine76.1.1.2K(AlSi3O8)
Al-Si Framework Feldspathoids and related species
Afghanite76.2.5.1(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6
Haüyne76.2.3.3(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Sodalite76.2.3.1Na8(Al6Si6O24)Cl2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Unclassified Minerals, Mixtures, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Andradite
var: Melanite
-Ca3Fe3+2(SiO4)3
Anorthite-Ca(Al2Si2O8)
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Cancrinite Group'-
'Chabazite'-
'Melilite Group'-Ca2M(XSiO7)
'Phillipsite'-
'Pyroxene Group'-
'Thomsonite'-

List of minerals for each chemical element

HHydrogen
H AnalcimeNa(AlSi2O6) · H2O
H ApatiteCa5(PO4)3(Cl/F/OH)
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H CuspidineCa4(Si2O7)(F,OH)2
H PhlogopiteKMg3(AlSi3O10)(OH)2
H GypsumCaSO4 · 2H2O
H Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
BBoron
B VonseniteFe22+Fe3+(BO3)O2
CCarbon
C CalciteCaCO3
C Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)
C Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
OOxygen
O Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6
O AnalcimeNa(AlSi2O6) · H2O
O AndraditeCa3Fe23+(SiO4)3
O Andradite (var: Melanite)Ca3Fe23+(SiO4)3
O AnorthiteCa(Al2Si2O8)
O ApatiteCa5(PO4)3(Cl/F/OH)
O BaddeleyiteZrO2
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O CalciteCaCO3
O CuspidineCa4(Si2O7)(F,OH)2
O HematiteFe2O3
O PhlogopiteKMg3(AlSi3O10)(OH)2
O GypsumCaSO4 · 2H2O
O GrossularCa3Al2(SiO4)3
O Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
O IlmeniteFe2+TiO3
O Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)
O MagnetiteFe2+Fe23+O4
O Melilite GroupCa2M(XSiO7)
O Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O QuartzSiO2
O SanidineK(AlSi3O8)
O SodaliteNa8(Al6Si6O24)Cl2
O SpinelMgAl2O4
O TitaniteCaTi(SiO4)O
O Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
O VonseniteFe22+Fe3+(BO3)O2
O WollastoniteCaSiO3
O ZirconZr(SiO4)
FFluorine
F ApatiteCa5(PO4)3(Cl/F/OH)
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
F CuspidineCa4(Si2O7)(F,OH)2
F Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
NaSodium
Na Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6
Na AnalcimeNa(AlSi2O6) · H2O
Na Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Na SodaliteNa8(Al6Si6O24)Cl2
MgMagnesium
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg SpinelMgAl2O4
AlAluminium
Al Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6
Al AnalcimeNa(AlSi2O6) · H2O
Al AnorthiteCa(Al2Si2O8)
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al GrossularCa3Al2(SiO4)3
Al Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Al Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)
Al Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al SanidineK(AlSi3O8)
Al SodaliteNa8(Al6Si6O24)Cl2
Al SpinelMgAl2O4
Al Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
SiSilicon
Si Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6
Si AnalcimeNa(AlSi2O6) · H2O
Si AndraditeCa3Fe23+(SiO4)3
Si Andradite (var: Melanite)Ca3Fe23+(SiO4)3
Si AnorthiteCa(Al2Si2O8)
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si CuspidineCa4(Si2O7)(F,OH)2
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si GrossularCa3Al2(SiO4)3
Si Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Si Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)
Si Melilite GroupCa2M(XSiO7)
Si Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si QuartzSiO2
Si SanidineK(AlSi3O8)
Si SodaliteNa8(Al6Si6O24)Cl2
Si TitaniteCaTi(SiO4)O
Si Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
Si WollastoniteCaSiO3
Si ZirconZr(SiO4)
PPhosphorus
P ApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
S Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6
S GypsumCaSO4 · 2H2O
S Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
S Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)
S Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
ClChlorine
Cl Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6
Cl ApatiteCa5(PO4)3(Cl/F/OH)
Cl Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Cl Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Cl SodaliteNa8(Al6Si6O24)Cl2
KPotassium
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
K PhlogopiteKMg3(AlSi3O10)(OH)2
K Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
K Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)
K SanidineK(AlSi3O8)
K Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
CaCalcium
Ca Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6
Ca AndraditeCa3Fe23+(SiO4)3
Ca Andradite (var: Melanite)Ca3Fe23+(SiO4)3
Ca AnorthiteCa(Al2Si2O8)
Ca ApatiteCa5(PO4)3(Cl/F/OH)
Ca CalciteCaCO3
Ca CuspidineCa4(Si2O7)(F,OH)2
Ca GypsumCaSO4 · 2H2O
Ca GrossularCa3Al2(SiO4)3
Ca Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Ca Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)
Ca Melilite GroupCa2M(XSiO7)
Ca TitaniteCaTi(SiO4)O
Ca Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
Ca WollastoniteCaSiO3
TiTitanium
Ti IlmeniteFe2+TiO3
Ti Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Ti TitaniteCaTi(SiO4)O
FeIron
Fe AndraditeCa3Fe23+(SiO4)3
Fe Andradite (var: Melanite)Ca3Fe23+(SiO4)3
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe HematiteFe2O3
Fe IlmeniteFe2+TiO3
Fe MagnetiteFe2+Fe23+O4
Fe VonseniteFe22+Fe3+(BO3)O2
ZrZirconium
Zr BaddeleyiteZrO2
Zr ZirconZr(SiO4)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Signoretti, E., Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25.


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