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Marioantofilliite

A valid IMA mineral species
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05977340017494027635516.jpg
Marioantofilliite

Monte Copello-Reppia mine, Reppia, Ne, Genoa, Liguria, Italy
08461940017633847863469.jpg
Marioantofilliite

Monte Copello-Reppia mine, Reppia, Ne, Genoa, Liguria, Italy
06419500017633847879741.jpg
Marioantofilliite, etc.

Monte Copello-Reppia mine, Reppia, Ne, Genoa, Liguria, Italy
00457200017493841534304.jpg
Marioantofilliite

Monte Copello-Reppia mine, Reppia, Ne, Genoa, Liguria, Italy
01710990017868293059564.jpg
Marioantofilliite

Monte Copello-Reppia mine, Reppia, Ne, Genoa, Liguria, Italy
01819570017606073738845.jpg
Marioantofilliite, etc.

Monte Copello-Reppia mine, Reppia, Ne, Genoa, Liguria, Italy
05977340017494027635516.jpg
Marioantofilliite

Monte Copello-Reppia mine, Reppia, Ne, Genoa, Liguria, Italy
04032810017621008102786.jpg
Marioantofilliite

Monte Copello-Reppia mine, Reppia, Ne, Genoa, Liguria, Italy
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About MarioantofilliiteHide

05766110017633853195328.jpg
Mario Antofilli
Formula:
[Cu4Al2(OH)12](CO3) · 3H2O
Colour:
Blue; green
Lustre:
Greasy
Specific Gravity:
2.825 (Calculated)
Crystal System:
Monoclinic
Name:
The name honours Mario Antofilli (1920–1983) for his contribution to the knowledge of the mineralogy of Liguria. During the 1970s and up to his death, he was active in supporting the activities of the Gruppo Mineralogico Ligure, where he served as president for many years. Mario Antofilli was author, along with Emilio Borgo and Andrea Palenzona, of the book I nostri minerali – Geologia e Mineralogia in Liguria, printed in 1983 (Antofilli et al., 1983). Moreover, he published a comprehensive review on Ligurian zeolites (Antofilli, 1982). His findings at the Molinello mine (Graveglia Valley) in the mid-1970s allowed the discovery of tiragalloite, the first natural arsenatotrisilicate (Gramaccioli et al., 1980).
It is topologically similar to that of other hydrotalcite-supergroup minerals and shows a distorted {001} brucite-like layer with Cu and Al statistically occupying an octahedrally coordinated M(1) site. The interlayer hosts disordered CO3 and H2O groups.


Unique IdentifiersHide

Mindat ID:
472233
Long-form identifier:
mindat:1:1:472233:1

IMA Classification of MarioantofilliiteHide

Classification of MarioantofilliiteHide

Strunz-mindat (2026):
5.DA.50

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
MafIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MarioantofilliiteHide

Lustre:
Greasy
Transparency:
Transparent
Colour:
Blue; green
Comment:
Green in case of elevated Fe contents (https://lavrion.gr/Minerals/M/Marioantofilliite.html).
Streak:
Light blue
Comment:
soft
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
None observed
Density:
2.825 g/cm3 (Calculated)

Optical Data of MarioantofilliiteHide

Type:
Biaxial (-)
RI values:
nα = 1.613(4) nβ = 1.626(3) nγ = 1.633(5)
2V:
Calculated: 69° to 72°
Max. Birefringence:
δ = 0.020
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Surface Relief:
High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure - the conoscopic view for a grain cut perpendicular to the acute bisectrix, using this mineral's 2V. The two small white dots mark the melatopes - the points where the two optic axes emerge - and are shown only when they fall within the field of view. The coloured bands are isochromatics, and the dark bands are isogyres.

Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
strong, with r>v
Pleochroism:
Visible
Comments:
X = colourless and Z = pale blue

Chemistry of MarioantofilliiteHide

Mindat Formula:
[Cu4Al2(OH)12](CO3) · 3H2O
Element Weights:
Element% weight
O45.983 %
Cu40.586 %
Al8.616 %
H2.897 %
C1.918 %

Calculated from ideal end-member formula.
O
Cu
Al
H
C
Elements listed:
Al, C, Cu, H, O - search for minerals with similar chemistry

Crystallography of MarioantofilliiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 5.590(3) Å, b = 2.9358(11) Å, c = 7.675(3) Å
β = 100.958(17)°
Ratio:
a:b:c = 1.904 : 1 : 2.614
Unit Cell V:
123.66 ų (Calculated from Unit Cell)
Comment:
z = 1/3

X-Ray Powder DiffractionHide

Type Occurrence of MarioantofilliiteHide

Type Locality:
ⓘ Monte Copello-Reppia mine, Reppia, Ne, Genoa, Liguria, Italy
General Appearance of Type Material:
globular aggregates, up to 1 mm in diameter, sometimes showing µm-sized prismatic crystals of marioantofilliite
Place of Conservation of Type Material:
Cotype material is deposited in the collections of the Museo di Storia Naturale, University of Pisa, Via Roma 79, Calci (PI), Italy, catalogue number 20081, and the National Museum, Cirkusová 1740, 193 00 Prague 9, Czech Republic, catalogue number P1P 3/2025
Geological Setting of Type Material:
The Monte Copello prospect exploited a sulfide ore body, mainly represented by pyrite and chalcopyrite within a gangue of calcite, quartz, and clay minerals, at the tectonized contact between basalts and Calpionella limestone. The ore body is deeply weathered, and it is represented by gossan.
Associated Minerals at Type Locality:
Allophane'Limonite'Malachite
Reference:
Biagioni, C.; Sejkora, J.; Perchiazzi, N.; Mugnaioli, E.; Mauro, D.; Belmonte, D.; Škoda, R.; Dolnı́ček, Z. (2025) Marioantofilliite, [Cu₄Al₂(OH)₁₂](CO₃)·3H₂O, a new member of the hydrotalcite supergroup from Liguria (Italy). European Journal of Mineralogy, 37 (5). 733-746 doi:10.5194/ejm-37-733-2025

Synonyms of MarioantofilliiteHide

Other Language Names for MarioantofilliiteHide

Relationship of Marioantofilliite to other SpeciesHide

Member of:
Hydrotalcite Supergroup
Other Members of Hydrotalcite Supergroup:
Akopovaite Al4Li2(OH)12(CO3)(H2O)3Mon. 2/m : B2/m
AmoraiteCa12Al6(OH)36(CO3)2(SO3) · 15H2O Tric. 1 : P1
BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2OHex.
CarbocalumiteCa4Al2(OH)12(CO3) · 6H2OTrig. 3m(32/m) : R3c
CoalingiteMg10Fe3+2(OH)24[CO3] · 2H2OTrig. 3m(32/m) : R3m
Cualstibite GroupM2R(OH)6[Sb5+(OH)6], where M = Zn, Ni, Cu and R = Al or Fe3+
DritsiteLi2Al4(OH)12Cl2 · 3H2OHex. 6/mmm(6/m2/m2/m) : P63/mcm
Fougèrite Group
Glaucocerinite Group
Hydrocalumite Group
Hydrotalcite GroupM6R3+2(OH)16Z · 4H2O, where M=Mg, Fe, Ni, R3+ = Al, Cr, Co or Fe, and Z=CO3, Cl
MuskoxiteMg7Fe4O13 · 10H2OTrig. 3m(32/m)
PoellmanniteCa6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2OTrig. 3 : R3
Quintinite Group
RotemiteCa4Cr2(OH)12Cl2 · 4H2OTrig. 3m(32/m) : R3c
'UM1987-05-OH:AlCMg'Mg4Al2(OH)12(CO3,SO4) · 3H2O
Wermlandite GroupM7R3+2(OH)18[Ca(H2O)6][SO4]2 · 6H2O, where = Mg, Fe, Zn and R= Al or Fe
Woodwardite GroupMay be considered a subgroup of the Hydrotalcite Group.

Common AssociatesHide

Associations Based on Photo Data:
9 photos of Marioantofilliite associated with MalachiteCu2(CO3)(OH)2
7 photos of Marioantofilliite associated with Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
1 photo of Marioantofilliite associated with GoethiteFe3+O(OH)
1 photo of Marioantofilliite associated with CupriteCu2O

Related Minerals - Strunz-mindat GroupingHide

5.DA.AlexkhomyakoviteK6(Ca2Na)(CO3)5Cl · 6H2OHex. 6/mmm(6/m2/m2/m) : P63/mcm
5.DA.AmoraiteCa12Al6(OH)36(CO3)2(SO3) · 15H2O Tric. 1 : P1
5.DA.05DypingiteMg5(CO3)4(OH)2 · 5H2OMon. 2 : P21
5.DA.05'UM1986-10-CO:ClHMgMnZn (also called Mineral F, Dunn, 1995)'Mg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O
5.DA.05'UM1987-01-CO:HMgS'Mg4(CO3)2(OH)4 · 6H2O ?Mon.
5.DA.05GiorgiositeMg5(CO3)4(OH)2 · 5-6H2O
5.DA.05HydromagnesiteMg5(CO3)4(OH)2 · 4H2OMon. 2/m : P21/b
5.DA.05WidgiemoolthaliteNi5(CO3)4(OH)2 · 5H2OMon. 2/m : P21/b
5.DA.10ArtiniteMg2(CO3)(OH)2 · 3H2OMon. 2/m : B2/m
5.DA.10ChlorartiniteMg2(CO3)(OH)Cl · 2H2OTrig. 3m : R3c
5.DA.10IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
5.DA.15ZaratiteNi3(CO3)(OH)4 · 4H2O ?Iso.
5.DA.15OtwayiteNi2(CO3)(OH)2 · H2OOrth.
5.DA.20KambaldaiteNaNi4(CO3)3(OH)3 · 3H2OHex. 6 : P63
5.DA.25CallaghaniteCu2Mg2(CO3)(OH)6 · 2H2OMon. 2/m : B2/b
5.DA.30Claraite(Cu,Zn)15(CO3)4(AsO4)2(SO4)(OH)14 · 7H2OTric. 1 : P1
5.DA.35HydroscarbroiteAl14(CO3)3(OH)36 · nH2OTric.
5.DA.35ScarbroiteAl5(CO3)(OH)13 · 5H2OTric.
5.DA.40KarchevskyiteMg18Al9(OH)54Sr2(CO3)9(H2O)6(H3O)5Trig.
5.DA.40'UM1987-05-OH:AlCMg'Mg4Al2(OH)12(CO3,SO4) · 3H2O
5.DA.40QuintiniteMg4Al2(OH)12(CO3) · 3H2OHex. 622 : P6322
5.DA.40CharmariteMn2+4Al2(OH)12[CO3] · 3H2OHex.
5.DA.40CaresiteFe2+4Al2(OH)12[CO3] · 3H2OTrig. 32 : P3112
5.DA.45'Hydrotalcite-2H'Mg6Al2(CO3)(OH)16 · 4H2OHex. 6/mmm(6/m2/m2/m) : P63/mmc
5.DA.45'Stichtite-2H'Mg6(Cr,Al)2(CO3)(OH)16 · 4H2OHex. 6/mmm(6/m2/m2/m) : P63/mmc
5.DA.45BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2OHex.
5.DA.45ZaccagnaiteZn4Al2(OH)12[CO3] · 3H2OHex.
5.DA.45'Pyroaurite-2H'Mg6Fe3+2(OH)16(CO3) · 4H2OHex. 6/mmm(6/m2/m2/m) : P63/mmc
5.DA.45LiudongshengiteZn4Cr2(OH)12(CO3) · 3H2OTrig. 3m(32/m) : R3m
5.DA.45ChlormagaluminiteMg4Al2(OH)12Cl2 · 3H2OHex. 6/mmm(6/m2/m2/m) : P63/mcm
5.DA.50PyroauriteMg6Fe3+2(OH)16[CO3] · 4H2OTrig. 3m(32/m) : R3m
5.DA.50TakoviteNi6Al2(OH)16[CO3] · 4H2OTrig. 3m(32/m) : R3m
5.DA.50ReevesiteNi6Fe3+2(OH)16(CO3) · 4H2OTrig. 3m(32/m) : R3m
5.DA.50KaznakhtiteNi6Co3+2(CO3)(OH)16 · 4H2OTrig. 3 : R3
5.DA.50ComblainiteNi4Co2(OH)12[CO3] · 3H2OTrig.
5.DA.50HydrotalciteMg6Al2(CO3)(OH)16 · 4H2OTrig. 3m(32/m) : R3m
5.DA.50StichtiteMg6Cr3+2(OH)16[CO3] · 4H2OTrig. 3m(32/m) : R3m
5.DA.50DesautelsiteMg6Mn3+2(OH)16[CO3] · 4H2OTrig. 3m(32/m)
5.DA.55CoalingiteMg10Fe3+2(OH)24[CO3] · 2H2OTrig. 3m(32/m) : R3m
5.DA.55Akopovaite Al4Li2(OH)12(CO3)(H2O)3Mon. 2/m : B2/m
5.DA.60ŠlikiteZn2Mg(CO3)2(OH)2 · 4H2OTric. 1 : P1
5.DA.65MarkliteCu5(CO3)2(OH)6 · 6H2OMon. 2/m : P21/b

Fluorescence of MarioantofilliiteHide

In UV light:
does not fluoresce under short- and long-wavelength UV radiation.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for MarioantofilliiteHide

References for MarioantofilliiteHide

Localities for MarioantofilliiteHide

Showing 2 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
        • Agios Konstantinos (Kamariza)
          • Kamariza Mines (Kamareza Mines)
lavrion.gr (2026)
Italy (TL)
 
  • Liguria
    • Genoa
      • Ne
        • Reppia
Bosi et al. (2025) +1 other reference
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