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Rovinj-1 bauxite deposit, Rovinj, Istria County, Croatiai
Regional Level Types
Rovinj-1 bauxite depositDeposit
Rovinj- not defined -
Istria CountyCounty
CroatiaCountry

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Key
Latitude & Longitude:
45° North , 16° East (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~340km
Locality type:
Name(s) in local language(s):
Ležišta boksita Rovinj-1, Rovinj (Rovigno), Istarska županija (Regione istriana), Hrvatska


Bauxite deposit of Jurassic age occurring at the contact of Upper Oxfordian–Lower Kimmeridgian and Upper Tithonian strata in an apparent stratigraphic gap of relatively short duration (about 6 Ma).

The bauxite deposit is about 400 m long and 300 m wide and its thickness decreases gradually from 20 m to 0 m towards the margin of the deposit. The bauxite is red in colour, muddy (pelitomorphic) with occasional round grains and small ooliths. On the outcrop scale, it is massive and shows a characteristic nodular to spheroidal parting. Joint surfaces are coated by Mn-oxides and/or kaolinite. The quality of the ore is medium to poor. It is highly argillaceous; the alumina to silica ratio is just above 2.6, with alumina around 46% and silica above 15%. Major minerals are böhmite, kaolinite, hematite, anatase, and minor chlorite. Extra-clasts identified by Šinkovec (1974) include rare zircon, tourmaline, and apatite grains, which testify to the relative isolation of the depositional environment from the non-carbonatic surroundings. The uppermost 20–30 cm of the bauxite is heavily altered: its colour is greenish–grey to yellowish–white with vertical to subvertical extensions penetrating the underlying deep red bauxite.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 valid minerals.

Detailed Mineral List:

Anatase
Formula: TiO2
Reference: Šinkovec, B. (1974) Jurski glinoviti boksiti zapadne Istre. Geološki Vjesnik, 27, 217–226; Durn, G., Ottner, F., Mindszenty, A., Tišljar, J., Mileusnić, M. (2006) Clay mineralogy of bauxites and palaeosols formed during regional subaerial exposures of the Adriatic Carbonate Platform. 3rd Mid-European Clay Conference – MECC 06, Field Trip Guidebook, Field Trip 1, 9-36.
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Reference: Šinkovec, B. (1974) Jurski glinoviti boksiti zapadne Istre. Geološki Vjesnik, 27, 217–226; Durn, G., Ottner, F., Mindszenty, A., Tišljar, J., Mileusnić, M. (2006) Clay mineralogy of bauxites and palaeosols formed during regional subaerial exposures of the Adriatic Carbonate Platform. 3rd Mid-European Clay Conference – MECC 06, Field Trip Guidebook, Field Trip 1, 9-36.
Böhmite
Formula: AlO(OH)
Reference: Šinkovec, B. (1974) Jurski glinoviti boksiti zapadne Istre. Geološki Vjesnik, 27, 217–226; Durn, G., Ottner, F., Mindszenty, A., Tišljar, J., Mileusnić, M. (2006) Clay mineralogy of bauxites and palaeosols formed during regional subaerial exposures of the Adriatic Carbonate Platform. 3rd Mid-European Clay Conference – MECC 06, Field Trip Guidebook, Field Trip 1, 9-36.
'Chlorite Group'
Reference: Šinkovec, B. (1974) Jurski glinoviti boksiti zapadne Istre. Geološki Vjesnik, 27, 217–226; Durn, G., Ottner, F., Mindszenty, A., Tišljar, J., Mileusnić, M. (2006) Clay mineralogy of bauxites and palaeosols formed during regional subaerial exposures of the Adriatic Carbonate Platform. 3rd Mid-European Clay Conference – MECC 06, Field Trip Guidebook, Field Trip 1, 9-36.
Hematite
Formula: Fe2O3
Reference: Šinkovec, B. (1974) Jurski glinoviti boksiti zapadne Istre. Geološki Vjesnik, 27, 217–226; Durn, G., Ottner, F., Mindszenty, A., Tišljar, J., Mileusnić, M. (2006) Clay mineralogy of bauxites and palaeosols formed during regional subaerial exposures of the Adriatic Carbonate Platform. 3rd Mid-European Clay Conference – MECC 06, Field Trip Guidebook, Field Trip 1, 9-36.
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: Šinkovec, B. (1974) Jurski glinoviti boksiti zapadne Istre. Geološki Vjesnik, 27, 217–226; Durn, G., Ottner, F., Mindszenty, A., Tišljar, J., Mileusnić, M. (2006) Clay mineralogy of bauxites and palaeosols formed during regional subaerial exposures of the Adriatic Carbonate Platform. 3rd Mid-European Clay Conference – MECC 06, Field Trip Guidebook, Field Trip 1, 9-36.
'Manganese Oxides'
Reference: Šinkovec, B. (1974) Jurski glinoviti boksiti zapadne Istre. Geološki Vjesnik, 27, 217–226; Durn, G., Ottner, F., Mindszenty, A., Tišljar, J., Mileusnić, M. (2006) Clay mineralogy of bauxites and palaeosols formed during regional subaerial exposures of the Adriatic Carbonate Platform. 3rd Mid-European Clay Conference – MECC 06, Field Trip Guidebook, Field Trip 1, 9-36.
'Tourmaline'
Formula: A(D3)G6(Si6O18)(BO3)3X3Z
Reference: Šinkovec, B. (1974) Jurski glinoviti boksiti zapadne Istre. Geološki Vjesnik, 27, 217–226; Durn, G., Ottner, F., Mindszenty, A., Tišljar, J., Mileusnić, M. (2006) Clay mineralogy of bauxites and palaeosols formed during regional subaerial exposures of the Adriatic Carbonate Platform. 3rd Mid-European Clay Conference – MECC 06, Field Trip Guidebook, Field Trip 1, 9-36.
Zircon
Formula: Zr(SiO4)
Reference: Šinkovec, B. (1974) Jurski glinoviti boksiti zapadne Istre. Geološki Vjesnik, 27, 217–226; Durn, G., Ottner, F., Mindszenty, A., Tišljar, J., Mileusnić, M. (2006) Clay mineralogy of bauxites and palaeosols formed during regional subaerial exposures of the Adriatic Carbonate Platform. 3rd Mid-European Clay Conference – MECC 06, Field Trip Guidebook, Field Trip 1, 9-36.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Anatase4.DD.05TiO2
Böhmite4.FE.15AlO(OH)
Hematite4.CB.05Fe2O3
Group 9 - Silicates
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Chlorite Group'-
'Manganese Oxides'-
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
AX2
Anatase4.4.4.1TiO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Böhmite6.1.2.1AlO(OH)
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Unclassified Minerals, Mixtures, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Chlorite Group'-
Kaolinite-Al2(Si2O5)(OH)4
'Manganese Oxides'-
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z

List of minerals for each chemical element

HHydrogen
H BöhmiteAlO(OH)
H KaoliniteAl2(Si2O5)(OH)4
H ApatiteCa5(PO4)3(Cl/F/OH)
BBoron
B TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
OOxygen
O BöhmiteAlO(OH)
O KaoliniteAl2(Si2O5)(OH)4
O HematiteFe2O3
O AnataseTiO2
O ZirconZr(SiO4)
O TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
O ApatiteCa5(PO4)3(Cl/F/OH)
FFluorine
F ApatiteCa5(PO4)3(Cl/F/OH)
AlAluminium
Al BöhmiteAlO(OH)
Al KaoliniteAl2(Si2O5)(OH)4
SiSilicon
Si KaoliniteAl2(Si2O5)(OH)4
Si ZirconZr(SiO4)
Si TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
PPhosphorus
P ApatiteCa5(PO4)3(Cl/F/OH)
ClChlorine
Cl ApatiteCa5(PO4)3(Cl/F/OH)
CaCalcium
Ca ApatiteCa5(PO4)3(Cl/F/OH)
TiTitanium
Ti AnataseTiO2
FeIron
Fe HematiteFe2O3
ZrZirconium
Zr ZirconZr(SiO4)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Šinkovec, B. (1974) Jurski glinoviti boksiti zapadne Istre. Geološki Vjesnik, 27, 217–226.
Durn, G., Ottner, F., Mindszenty, A., Tišljar, J., and Mileusnić, M. (2006) Clay mineralogy of bauxites and palaeosols formed during regional subaerial exposures of the Adriatic Carbonate Platform. 3rd Mid-European Clay Conference – MECC 06, Field Trip Guidebook, Field Trip 1, 9-36.


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