Piccoliite
A valid IMA mineral species
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About Piccoliite
Gian Paolo Piccoli (right) and Gian Carlo Piccoli (left)
Formula:
NaCaMn3+2(AsO4)2O(OH)
Colour:
Black. It is transparent in thin section although very deep red coloured.
Lustre:
Resinous
Hardness:
5 - 5½
Specific Gravity:
4.084 (Calculated)
Crystal System:
Orthorhombic
Name:
In honour of the mineral collectors Gian Paolo Piccoli (1928–1996) and his son Gian Carlo (b. 1953) for their contribution to the knowledge of the regional mineralogy of Piedmont. It was first recognized on a specimen found in 2007 by Gian Carlo.
Unique Identifiers
Mindat ID:
51847
Long-form identifier:
mindat:1:1:51847:1
IMA Classification of Piccoliite
Classification of Piccoliite
8.BH.85
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Pcc | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Piccoliite
Resinous
Transparency:
Transparent
Colour:
Black. It is transparent in thin section although very deep red coloured.
Streak:
Brown
Hardness:
5 - 5½ on Mohs scale
Hardness:
VHN5=584 - 657 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None observed.
Fracture:
Irregular/Uneven
Density:
4.084 g/cm3 (Calculated)
Comment:
Density was not measured. Calculated value is based on empirical data from Montaldo di Mondovì (4.011 for Valletta sample).
Optical Data of Piccoliite
Anisotropism:
Distinct, in shades of grey.
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 470nm | 7.7% | 9.8% |
| 546nm | 7.7% | 9.5% |
| 589nm | 7.4% | 9.3% |
| 650nm | 7.4% | 9.2% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 9.8%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Grey.
Internal Reflections:
Common, in brownish tints.
Comments:
Calculated mean refractive index is 1.878.
Chemistry of Piccoliite
Mindat Formula:
NaCaMn3+2(AsO4)2O(OH)
Element Weights:
Chemical Analysis
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | (Na0.64Ca0.35)?0.99(Ca0.75Na0.24)?0.99(Mn3+1.08Fe3+0.59Mg0.20Ca0.10)?1.97(As2.03V0.03Si0.01)?2.07O9(OH) |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Valletta Mine, Vallone della Valletta, Canosio, Cuneo Province, Piedmont, Italy | WDS-EPMA, based on 10 anions pfu |
Crystallography of Piccoliite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbcm
Setting:
Pbcm
Cell Parameters:
a = 8.8761(9) Å, b = 7.5190(8) Å, c = 11.689(1) Å
Ratio:
a:b:c = 1.18 : 1 : 1.555
Unit Cell V:
780.12 ų (Calculated from Unit Cell)
Comment:
Data above for Montaldo di Mondovì sample. a = 8.8889, b = 7.5269, c = 11.6795 Å for Valletta sample.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.85 Å | (57) |
| 3.470 Å | (59) |
| 3.167 Å | (100) |
| 2.742 Å | (30) |
| 2.683 Å | (53) |
| 2.580 Å | (50) |
| 2.325 Å | (19) |
Comments:
Montaldo Mine, Piedmont, Italy. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Piccoliite
Co-Type Localities:
General Appearance of Type Material:
Aggregates of black anhedral crystals, embedded in the quartz matrix, and rarely as black well-developed prisms.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Museo di Storia Naturale Naturale, Università di Pisa,Italy, catalogue number 19906 (holotype), and the Museo Civico Archeologico e di Scienze Naturali “F. Eusebio”, Alba, Italy, catalogue number.
Geological Setting of Type Material:
In Fe–Mn ore hosted in metaquartzites.
Associated Minerals at Type Locality:
Synonyms of Piccoliite
Other Language Names for Piccoliite
Dutch:Piccoliiet
German:Piccoliit
Common Associates
Related Minerals - Strunz-mindat Grouping
| 8.BH. | Peterchinite | Zn3Zn2(OH)6As[O3(OH)3] |
| 8.BH. | Reznitskyite | CaMg(VO4)F |
| 8.BH. | Plumbogottlobite | PbMg(VO4)(OH) |
| 8.BH. | Cuprozheshengite | Pb4CuZn2(AsO4)2(PO4)2(OH)2 |
| 8.BH. | Zheshengite | Pb4ZnZn2(AsO4)2(PO4)2(OH)2 |
| 8.BH. | Crimsonite | PbFe3+2(PO4)2(OH)2 |
| 8.BH.05 | Thadeuite | Ca(Mg,Fe2+)3(PO4)2(OH,F)2 |
| 8.BH.10 | Panasqueiraite | CaMg(PO4)(OH) |
| 8.BH.10 | Isokite | CaMg(PO4)F |
| 8.BH.10 | Lacroixite | NaAl(PO4)F |
| 8.BH.10 | Arsenatrotitanite | NaTi(AsO4)O |
| 8.BH.10 | Maxwellite | NaFe3+(AsO4)F |
| 8.BH.10 | Durangite | NaAl(AsO4)F |
| 8.BH.10 | Kononovite | NaMg(SO4)F |
| 8.BH.15 | Drugmanite | Pb2Fe3+(PO4)(PO3OH)(OH)2 |
| 8.BH.20 | Nigelcookite | PbFe2+2V3+2(PO4)3(OH)3 |
| 8.BH.20 | Plumbojohntomaite | PbFe2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Cirrolite | Ca3Al2(PO4)3(OH)3 (?) |
| 8.BH.20 | Penikisite | Ba(Mg,Fe2+,Ca)2Al2(PO4)3(OH)3 |
| 8.BH.20 | Perloffite | Ba(Mn2+,Fe2+)2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Bjarebyite Group | |
| 8.BH.20 | Strontioperloffite | SrMn2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Plumboperloffite | PbMn2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Johntomaite | BaFe2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Bjarebyite | (Ba,Sr)(Mn2+,Fe2+,Mg)2Al2(PO4)3(OH)3 |
| 8.BH.20 | Kulanite | Ba(Fe2+,Mn2+,Mg)2(Al,Fe3+)2(PO4)3(OH)3 |
| 8.BH.25 | Bertossaite | Li2CaAl4(PO4)4(OH)4 |
| 8.BH.25 | Natropalermoite | Na2SrAl4(PO4)4(OH)4 |
| 8.BH.25 | Palermoite | Li2SrAl4(PO4)4(OH)4 |
| 8.BH.30 | Sewardite | CaFe3+2(AsO4)2(OH)2 |
| 8.BH.30 | Carminite | PbFe3+2(AsO4)2(OH)2 |
| 8.BH.35 | Adelite | CaMg(AsO4)(OH) |
| 8.BH.35 | Duftite | PbCu(AsO4)(OH) |
| 8.BH.35 | Cobaltaustinite | CaCo(AsO4)(OH) |
| 8.BH.35 | Nickelaustinite | CaNi(AsO4)(OH) |
| 8.BH.35 | Gabrielsonite | PbFe3+(As3+O3)O |
| 8.BH.35 | Conichalcite | CaCu(AsO4)(OH) |
| 8.BH.35 | Arsendescloizite | PbZn(AsO4)(OH) |
| 8.BH.35 | 'Duftite-alpha' | PbCu(AsO4)(OH) |
| 8.BH.35 | Gottlobite | CaMg(VO4)(OH) |
| 8.BH.35 | Austinite | CaZn(AsO4)(OH) |
| 8.BH.35 | Hermannroseite | CaCu(PO4)(OH) |
| 8.BH.35 | Tangeite | CaCu(VO4)(OH) |
| 8.BH.40 | Čechite | PbFe2+(VO4)(OH) |
| 8.BH.40 | Khorixasite | (Bi0.67◻0.33)Cu(VO4)(OH) |
| 8.BH.40 | Mottramite | PbCu(VO4)(OH) |
| 8.BH.40 | Descloizite | PbZn(VO4)(OH) |
| 8.BH.40 | Pyrobelonite | PbMn2+(VO4)(OH) |
| 8.BH.45 | Bayldonite | PbCu3(AsO4)2(OH)2 |
| 8.BH.45 | Vésigniéite | BaCu3(VO4)2(OH)2 |
| 8.BH.50 | Paganoite | NiBi(AsO4)O |
| 8.BH.55 | Jagowerite | BaAl2(PO4)2(OH)2 |
| 8.BH.55 | Harrisonite | Ca(Fe2+,Mg)6(PO4)2(SiO4)2 |
| 8.BH.60 | Attakolite | CaMn2+Al4(SiO3OH)(PO4)3(OH)4 |
| 8.BH.65 | Leningradite | PbCu3(VO4)2Cl |
| 8.BH.70 | Katiarsite | KTiO(AsO4) |
| 8.BH.70 | Yurgensonite | K2SnTiO2(AsO4)2 |
| 8.BH.75 | Melanarsite | K3Cu7Fe3+O4(AsO4)4 |
| 8.BH.80 | Evseevite | Na2Mg(AsO4)F |
| 8.BH.80 | Moraskoite | Na2Mg(PO4)F |
Fluorescence of Piccoliite
Not fluorescent.
Other Information
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 Piccoliite
mindat.org URL:
https://www.mindat.org/min-51847.html
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References for Piccoliite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2017) New minerals and nomenclature modifications approved in 2017, CNMNC Newsletter No 37. Mineralogical Magazine, 81 (3) 737-742 doi:10.1180/minmag.2017.081.039
Cámara, Fernando, Biagioni, Cristian, Ciriotti, Marco E., Bosi, Ferdinando, Kolitsch, Uwe, Paar, Werner H., Hålenius, Ulf, Lepore, Giovanni O., Blass, Günter, Bittarello, Erica (2022) Piccoliite, NaCaMn3+2(AsO4)2O(OH), a new arsenate from the manganese deposits of Montaldo di Mondovì and Valletta, Piedmont, Italy. Mineralogical Magazine, 87 (2) 204-217 doi:10.1180/mgm.2022.129
Localities for Piccoliite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
| Hålenius et al. (2017) +2 other references |
| www.socgeol.it (n.d.) +5 other references |
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Montaldo Mine, Borgata Oberti, Montaldo di Mondovì, Cuneo Province, Piedmont, Italy