Campo Padella, Capranica, Viterbo Province, Lazio, Italyi
| Regional Level Types | |
|---|---|
| Campo Padella | Mineral Occurrence Area |
| Capranica | Commune |
| Viterbo Province | Province |
| Lazio | Administrative Region |
| Italy | Country |
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Latitude & Longitude (WGS84):
42° 16' 43'' North , 12° 9' 2'' East
Latitude & Longitude (decimal):
Köppen climate type:
Name(s) in local language(s):
Campo Padella, Capranica, Complesso vulcanico di Vico (Lago di Vico), Provincia di Viterbo, Lazio, Italia
Volcanic ejecta within an explosive breccia belonging to one of the pyroclastic flow units (ignimbrite "C") of the Vico volcanic complex at Campo Padella locality (area around Strada Campo Padella and Strada Cacchieto), northwest of Capranica.
Campo Padella is the type locality for hellandite-(Ce), that has been found inside an ejectum, whose host rock can be classified as an
alkali-syenite. The ejectum is massive and fine-grained and is composed of abundant K-feldspar (Or70Ab30), some plagioclase (Ab85An15), and minor fluorophlogopite (F-rich biotite), augitic clinopyroxene, titanite, and magnetite as main phases; there are also several accessory phases including zircon, fluorapatite, allanite, and Th-, U-, REE-bearing phosphates and silico-phosphates close to minerals of the monazite group.
Hellandite-(Ce) occurs inside miarolitic cavities resulting from the interlocked texture of the feldspars and is typically associated with vonsenite, helvite, baddeleyite, vicanite-(Ce), and britholite-(Ce). Crystals of hellandite-(Ce), up to 0.3–0.4 mm in size, are euhedral, transparent, and light-green or brownish (Oberti et al., 1999). Hellandite-(Ce) has also been observed inside the groundmass of the ejectum; in this case, it fills voids and fractures inside the rock and is systematically intergrown with britholite-(Ce), with hellandite rimming britholite in all observed cases (Della Ventura et al., 1999).
From a chemical point of view, it is considered a (Th,U)-rich and Y-poor variety (Oberti et al., 1999). Detailed studies on samples of this non-metamict hellandite and from other localities of Latium have brought about a redefinition of the hellandite group and the new nomenclature rules (Oberti et al., 2002).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Goethite | 4.00. | Fe3+O(OH) |
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Opal | 4.DA.10 | SiO2 · nH2O |
| ⓘ | Baddeleyite | 4.DE.35 | ZrO2 |
| ⓘ | Zirconolite | 4.DH.30 | CaZrTi2O7 |
| Group 6 - Borates | |||
| ⓘ | Vonsenite | 6.AB.30 | Fe2+2Fe3+(BO3)O2 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Fluorapatite | 8.BN.05 | Ca5(PO4)3F |
| Group 9 - Silicates | |||
| ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
| ⓘ | Titanite | 9.AG.15 | CaTi(SiO4)O |
| ⓘ | Britholite-(Ce) | 9.AH.25 | (Ce,Ca)5(SiO4)3OH |
| ⓘ | Vicanite-(Ce) | 9.AJ.35 | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
| ⓘ | Augite | 9.DA.15 | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| ⓘ | Hellandite-(Ce) (TL) | 9.DK.20 | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 |
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Fluorophlogopite | 9.EC.20 | KMg3(Si3Al)O10F2 |
| ⓘ | Nepheline | 9.FA.05 | Na3K(Al4Si4O16) |
| ⓘ | Sanidine | 9.FA.30 | K(AlSi3O8) |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | Helvine | 9.FB.10 | Be3Mn2+4(SiO4)3S |
| ⓘ | Nosean | 9.FB.10 | Na8(Al6Si6O24)(SO4) · H2O |
| ⓘ | Sodalite | 9.FB.10 | Na4(Si3Al3)O12Cl |
| ⓘ | Leucite | 9.GB.05 | K(AlSi2O6) |
| Unclassified | |||
| ⓘ | 'Hellandite Group' | - | X4Y2ZT2[B4Si4O22]W2 |
| ⓘ | 'Cancrinite Group' | - | |
| ⓘ | 'Britholite Group' | - | (REE,Ca)5[(Si,P)O4]3X |
| ⓘ | 'Allanite Group' | - | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Britholite-(Ce) | (Ce,Ca)5(SiO4)3OH |
| H | ⓘ Goethite | Fe3+O(OH) |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Nosean | Na8(Al6Si6O24)(SO4) · H2O |
| H | ⓘ Opal | SiO2 · nH2O |
| H | ⓘ Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 |
| H | ⓘ Allanite Group | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
| Be | Beryllium | |
| Be | ⓘ Helvine | Be3Mn42+(SiO4)3S |
| B | Boron | |
| B | ⓘ Vonsenite | Fe22+Fe3+(BO3)O2 |
| B | ⓘ Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
| B | ⓘ Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 |
| B | ⓘ Hellandite Group | X4Y2ZT2[B4Si4O22]W2 |
| O | Oxygen | |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| O | ⓘ Baddeleyite | ZrO2 |
| O | ⓘ Britholite-(Ce) | (Ce,Ca)5(SiO4)3OH |
| O | ⓘ Fluorapatite | Ca5(PO4)3F |
| O | ⓘ Goethite | Fe3+O(OH) |
| O | ⓘ Helvine | Be3Mn42+(SiO4)3S |
| O | ⓘ Leucite | K(AlSi2O6) |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Nepheline | Na3K(Al4Si4O16) |
| O | ⓘ Nosean | Na8(Al6Si6O24)(SO4) · H2O |
| O | ⓘ Opal | SiO2 · nH2O |
| O | ⓘ Sanidine | K(AlSi3O8) |
| O | ⓘ Sodalite | Na4(Si3Al3)O12Cl |
| O | ⓘ Titanite | CaTi(SiO4)O |
| O | ⓘ Vonsenite | Fe22+Fe3+(BO3)O2 |
| O | ⓘ Zircon | Zr(SiO4) |
| O | ⓘ Zirconolite | CaZrTi2O7 |
| O | ⓘ Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
| O | ⓘ Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 |
| O | ⓘ Fluorophlogopite | KMg3(Si3Al)O10F2 |
| O | ⓘ Hellandite Group | X4Y2ZT2[B4Si4O22]W2 |
| O | ⓘ Britholite Group | (REE,Ca)5[(Si,P)O4]3X |
| O | ⓘ Allanite Group | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
| F | Fluorine | |
| F | ⓘ Fluorapatite | Ca5(PO4)3F |
| F | ⓘ Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
| F | ⓘ Fluorophlogopite | KMg3(Si3Al)O10F2 |
| Na | Sodium | |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Na | ⓘ Nepheline | Na3K(Al4Si4O16) |
| Na | ⓘ Nosean | Na8(Al6Si6O24)(SO4) · H2O |
| Na | ⓘ Sodalite | Na4(Si3Al3)O12Cl |
| Na | ⓘ Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
| Mg | Magnesium | |
| Mg | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Mg | ⓘ Fluorophlogopite | KMg3(Si3Al)O10F2 |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Leucite | K(AlSi2O6) |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Nepheline | Na3K(Al4Si4O16) |
| Al | ⓘ Nosean | Na8(Al6Si6O24)(SO4) · H2O |
| Al | ⓘ Sanidine | K(AlSi3O8) |
| Al | ⓘ Sodalite | Na4(Si3Al3)O12Cl |
| Al | ⓘ Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 |
| Al | ⓘ Fluorophlogopite | KMg3(Si3Al)O10F2 |
| Si | Silicon | |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Si | ⓘ Britholite-(Ce) | (Ce,Ca)5(SiO4)3OH |
| Si | ⓘ Helvine | Be3Mn42+(SiO4)3S |
| Si | ⓘ Leucite | K(AlSi2O6) |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Nepheline | Na3K(Al4Si4O16) |
| Si | ⓘ Nosean | Na8(Al6Si6O24)(SO4) · H2O |
| Si | ⓘ Opal | SiO2 · nH2O |
| Si | ⓘ Sanidine | K(AlSi3O8) |
| Si | ⓘ Sodalite | Na4(Si3Al3)O12Cl |
| Si | ⓘ Titanite | CaTi(SiO4)O |
| Si | ⓘ Zircon | Zr(SiO4) |
| Si | ⓘ Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
| Si | ⓘ Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 |
| Si | ⓘ Fluorophlogopite | KMg3(Si3Al)O10F2 |
| Si | ⓘ Hellandite Group | X4Y2ZT2[B4Si4O22]W2 |
| Si | ⓘ Britholite Group | (REE,Ca)5[(Si,P)O4]3X |
| Si | ⓘ Allanite Group | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
| P | Phosphorus | |
| P | ⓘ Fluorapatite | Ca5(PO4)3F |
| P | ⓘ Britholite Group | (REE,Ca)5[(Si,P)O4]3X |
| S | Sulfur | |
| S | ⓘ Helvine | Be3Mn42+(SiO4)3S |
| S | ⓘ Nosean | Na8(Al6Si6O24)(SO4) · H2O |
| Cl | Chlorine | |
| Cl | ⓘ Sodalite | Na4(Si3Al3)O12Cl |
| K | Potassium | |
| K | ⓘ Leucite | K(AlSi2O6) |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Nepheline | Na3K(Al4Si4O16) |
| K | ⓘ Sanidine | K(AlSi3O8) |
| K | ⓘ Fluorophlogopite | KMg3(Si3Al)O10F2 |
| Ca | Calcium | |
| Ca | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Ca | ⓘ Britholite-(Ce) | (Ce,Ca)5(SiO4)3OH |
| Ca | ⓘ Fluorapatite | Ca5(PO4)3F |
| Ca | ⓘ Titanite | CaTi(SiO4)O |
| Ca | ⓘ Zirconolite | CaZrTi2O7 |
| Ca | ⓘ Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
| Ca | ⓘ Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 |
| Ca | ⓘ Britholite Group | (REE,Ca)5[(Si,P)O4]3X |
| Ti | Titanium | |
| Ti | ⓘ Titanite | CaTi(SiO4)O |
| Ti | ⓘ Zirconolite | CaZrTi2O7 |
| Mn | Manganese | |
| Mn | ⓘ Helvine | Be3Mn42+(SiO4)3S |
| Fe | Iron | |
| Fe | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Fe | ⓘ Goethite | Fe3+O(OH) |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | ⓘ Vonsenite | Fe22+Fe3+(BO3)O2 |
| Fe | ⓘ Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
| As | Arsenic | |
| As | ⓘ Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
| Zr | Zirconium | |
| Zr | ⓘ Baddeleyite | ZrO2 |
| Zr | ⓘ Zircon | Zr(SiO4) |
| Zr | ⓘ Zirconolite | CaZrTi2O7 |
| La | Lanthanum | |
| La | ⓘ Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
| Ce | Cerium | |
| Ce | ⓘ Britholite-(Ce) | (Ce,Ca)5(SiO4)3OH |
| Ce | ⓘ Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
| Ce | ⓘ Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 |
| Th | Thorium | |
| Th | ⓘ Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
Other Regions, Features and Areas containing this locality
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References
Della Ventura, Giancarlo, Williams, C. Terry, Cabella, Roberto, Oberti, Roberta, Caprilli, Enrico, Bellatreccia, Fabio (1999) Britholite-hellandite intergrowths and associated REE-minerals from the alkali-syenitic ejecta of the Vico volcanic complex (Latium, Italy): petrological implications bearing on REE mobility in volcanic systems. European Journal of Mineralogy, 11 (5) 843-854 doi:10.1127/ejm/11/5/0843
Oberti, Roberta, Ottolini, Luisa, Camara, Fernando, Della Ventura, Giancarlo (1999) Crystal structure of non-metamict Th-rich hellandite-(Ce) from Latium (Italy) and crystal chemistry of the hellandite-group minerals. American Mineralogist, 84 (5) 913-921 doi:10.2138/am-1999-5-626
Campo Padella, Capranica, Viterbo Province, Lazio, Italy