Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Monte Gelato manganese deposit (Mazzano manganese deposit), Mazzano Romano, Metropolitan City of Rome Capital, Lazio, Italyi
Regional Level Types
Monte Gelato manganese deposit (Mazzano manganese deposit)Deposit
Mazzano Romano- not defined -
Metropolitan City of Rome CapitalMetropolitan City
LazioAdministrative Region
ItalyCountry

This page is currently not sponsored. Click here to sponsor this page.
Key
Lock Map
Name(s) in local language(s):Deposito manganesifero di Monte Gelato (Deposito manganesifro di Mazzano), Mazzano Romano, Roma, Lazio, Italia
Latitude & Longitude (WGS84): 42° 11' 9'' North , 12° 23' 33'' East
Latitude & Longitude (decimal): 42.18611,12.39250
GeoHash:G#: sr2zczxzy
Locality type:Deposit
Köppen climate type:Csa : Hot-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Mazzano Romano2,493 (2014)2.2km
Grezzano-Pian delle Rose200 (2014)2.6km
Calcata Vecchia143 (2014)4.1km
Monte Sarleo223 (2014)4.4km
Calcata Nuova611 (2014)4.6km


The small manganese deposit is located near Monte Gelato (it includes the hill known as Le Calcare and extends towards Le Scese locality), right bank of River Treja (Fosso Treja), about 2 km SW of Mazzano Romano (Fornaseri, 1950; Sabella, 1954). This deposit is entirely enclosed in pyroclastic rocks (tuffs) of the «Tufi Stratificati Varicolori de La Storta» (a stratified tuff sequence). It is just one of the over 50 similar deposits occurring in the alkaline volcanic rocks of northern Latium. However, it has been studied in detail, thanks to the presence of a quarry (42°11'9'' N, 12°23'33'' E) that well exposed the stratigraphic sequence (Barrese et al., 1986; Barbieri et al., 1993).

The Monte Gelato deposit formed during Quaternary, probably in the time interval 442 to 230 ky, by water leaching of the pyroclastic rocks. The leaching action was promoted by the presence at that time of a lake in Mazzano area, and developed during two cycles, separated by a sterile phase during which the lake was momentarily filled by new pyroclastic eruptions.

Ranciéite could form owing to adsorbtion of the Mn carried in solution by the water onto hydrous Al minerals (mainly halloysite) which had formed during partial argillation of the pyroclastic pile underneath the lake. Despite being entirely encased within pyroclastic rocks, this manganese deposit is non-volcanogenic in its primary origin nor is related to precipitation from hot geothermal waters; rather, it is typically sedimentogenous, since it derives from adsorption/precipitation of metal solutes contained in the cold ground-table waters at a depth where their redox conditions were turning from reduced to oxidised.

Halloysite and ranciéite coexist throughout the entire «Tufi Stratificati Varicolori de La Storta» formation, but they are missing in the basal ignimbrites. They are particularly abundant in three enriched Mn horizons. Moreover, they also occur in an open fault (as described by Barrese et al., 1986) and in all the fractures crossing the Mazzano sequence. Ranciéite is particularly abundant in the open fault, where it occurs as almost monomineralic stalactites and concretions of fairly large size (2-5 cm).

Regions containing this locality

Eurasian PlateTectonic Plate
EuropeContinent

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


1 valid mineral.

Detailed Mineral List:

'Halloysite'
Formula: Al2(Si2O5)(OH)4
Reference: Barrese, E., Giampaolo, C., Grubessi, O., Mottana, A. (1986) Ranciéite from Mazzano Romano (Latium, Italy). Mineralogical Magazine, 50, 355, 111-118; Barbieri, M., Barrese, E., Giampaolo, C., Grubessi, O., Mottana, A., Voltaggio, M. (1993) Genesis of the manganese deposit of Mazzano Romano (Latium, Italy). Geologica Romana, 29, 113-129.
Ranciéite
Formula: (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O
Reference: Barrese, E., Giampaolo, C., Grubessi, O., Mottana, A. (1986) Ranciéite from Mazzano Romano (Latium, Italy). Mineralogical Magazine, 50, 355, 111-118; Barbieri, M., Barrese, E., Giampaolo, C., Grubessi, O., Mottana, A., Voltaggio, M. (1993) Genesis of the manganese deposit of Mazzano Romano (Latium, Italy). Geologica Romana, 29, 113-129.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Ranciéite4.FL.40(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O
Group 9 - Silicates
'Halloysite'9.ED.10Al2(Si2O5)(OH)4

List of minerals arranged by Dana 8th Edition classification

Group 7 - MULTIPLE OXIDES
AB4X9
Ranciéite7.10.1.1(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
'Halloysite'71.1.1.4Al2(Si2O5)(OH)4

List of minerals for each chemical element

HHydrogen
H Ranciéite(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O
H HalloysiteAl2(Si2O5)(OH)4
OOxygen
O Ranciéite(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O
O HalloysiteAl2(Si2O5)(OH)4
AlAluminium
Al HalloysiteAl2(Si2O5)(OH)4
SiSilicon
Si HalloysiteAl2(Si2O5)(OH)4
CaCalcium
Ca Ranciéite(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O
MnManganese
Mn Ranciéite(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Cenozoic
0 - 66 Ma



ID: 3185029
Cenozoic volcanic rocks

Age: Cenozoic (0 - 66 Ma)

Lithology: Volcanic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Quaternary
0 - 2.588 Ma



ID: 3159111
Quaternary trachyte

Age: Pleistocene (0 - 2.588 Ma)

Lithology: Major:{trachyte}, Minor{latite,phonolitic tephrite, tephritic phonolite}

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Fornaseri, M. (1950) Un deposito manganesifero nei pressi di Mazzano Romano. Rendiconti della Società Italiana di Mineralogia e Petrologia, 6, 96-100.
Sabella, A. (1954) I giacimenti di manganese nelle provincie di Roma e Viterbo. L’Industria Mineraria, 5, 5, 245–248.
Stoppani, F.S., Curti, E. (1982) I minerali del Lazio. Editoriale Olimpia, Firenze, 291 pp.
Barrese, E., Giampaolo, C., Grubessi, O., Mottana, A. (1986) Ranciéite from Mazzano Romano (Latium, Italy). Mineralogical Magazine, 50, 355, 111-118.
Barbieri, M., Barrese, E., Giampaolo, C., Grubessi, O., Mottana, A., Voltaggio, M. (1993) Genesis of the manganese deposit of Mazzano Romano (Latium, Italy). Geologica Romana, 29, 113-129.
Cotterell, T.F., Jenkins, D.A. (2008) Ranciéite from Mynydd Parys, Amlwch, Anglesey, Wales. Journal of the Russell Society, vol. 11, 59-63 (referring to Barrese et al., 1986).

External Links



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.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: April 22, 2019 09:44:32 Page generated: April 9, 2019 00:30:50
Go to top of page