Piemontite-(Pb)
A valid IMA mineral species
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About Piemontite-(Pb)
Formula:
(CaPb)(AlAlMn3+)O[Si2O7][SiO4](OH)
Colour:
purplish-red
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
4.282 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named as the lead-dominant analogue of piemontite. The root name is for the Piedmont region in Italy; Piemont in Italian.
This page provides mineralogical data about Piemontite-(Pb).
Unique Identifiers
Mindat ID:
42876
Long-form identifier:
mindat:1:1:42876:1
GUID
(UUID V4):
(UUID V4):
aaaf813d-7bfb-47dc-9640-352ac2e9e965
IMA Classification of Piemontite-(Pb)
Approved
IMA Formula:
CaPb(Al2Mn3+)[Si2O7][SiO4]O(OH)
Approval year:
2011
First published:
2012
Classification of Piemontite-(Pb)
9.BG.05
9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Symbol | Source | Reference |
---|---|---|
Pmt-Pb | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pmt | Whitney & Evans (2010) | Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371 |
Pie | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Piemontite-(Pb)
Vitreous
Colour:
purplish-red
Streak:
pink
Hardness:
6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
perfect on (001), and distinct on (010).
perfect on (001), and distinct on (010).
Density:
4.282 g/cm3 (Calculated)
Optical Data of Piemontite-(Pb)
Type:
Biaxial (-)
RI values:
nα = 1.835(10) nβ = 1.885(10) nγ = 1.895(10)
2V:
Measured: 30° to 40°, Calculated: 47°
Max Birefringence:
δ = 0.060
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
very strong, r>v.
Pleochroism:
Visible
Comments:
Z (red-brown)>Y (light red-brown)>X (light lilac)
Chemistry of Piemontite-(Pb)
Mindat Formula:
(CaPb)(AlAlMn3+)O[Si2O7][SiO4](OH)
Crystallography of Piemontite-(Pb)
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 8.938(1) Å, b = 5.6810(6) Å, c = 10.289(1) Å
β = 114.17(1)°
β = 114.17(1)°
Ratio:
a:b:c = 1.573 : 1 : 1.811
Unit Cell V:
476.64 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
8.12 Å | (68) |
4.67 Å | (53) |
3.518 Å | (77) |
2.931 Å | (100) |
2.843 Å | (51) |
2.736 Å | (57) |
2.619 Å | (66) |
2.122 Å | (46) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
31 : Thermally altered carbonate, phosphate, and iron formations |
Type Occurrence of Piemontite-(Pb)
General Appearance of Type Material:
imperfect blocky crystals to 2mm
Place of Conservation of Type Material:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow,Russia, registration number 4193/1
Geological Setting of Type Material:
dolomitic marbles and barite schists
Associated Minerals at Type Locality:
Reference:
Chukanov, N.V., Varlamov, D.A., Nestola, F., Belakovskiy, D.I., Goettlicher, J., Britvin, S.N., Lanza, A., Jancev, S. (2012) Piemontite-(Pb), CaPbAl2Mn3+ [Si2O7][SiO4] O (OH), a new mineral species of the epidote supergroup. Neues Jahrbuch für Mineralogie-Abhandlungen, Journal of Mineralogy and Geochemistry: 189(3): 275-286.
Synonyms of Piemontite-(Pb)
Relationship of Piemontite-(Pb) to other Species
Member of:
Other Members of this group:
Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
Epidote-(Sr) | (CaSr)(AlAlFe3+)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
Hancockite | (CaPb)(AlAlFe3+)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
Heflikite | (CaCa)(AlAlSc)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
Mukhinite | (CaCa)(AlAlV3+)O[Si2O7][SiO4](OH) | Mon. |
Niigataite | (CaSr)(AlAlAl)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
Piemontite | (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
Piemontite-(Sr) | (CaSr)(AlAlMn3+)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
Tweddillite | (CaSr)(Mn3+AlMn3+)O[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
Unnamed (Fe3+ analogue of Piemontite-(Pb)) | (CaPb)(Fe3+AlMn3+)O[Si2O7][SiO4](OH) | |
Unnamed (Fe3+-analogue of Piemontite) | (CaCa)(Fe3+AlMn3+)O[Si2O7][SiO4](OH) | |
Unnamed (Fe3+-analogue of Piemontite-(Sr)) | (CaSr)(Fe3+AlMn3+)O[Si2O7][SiO4](OH) | |
Unnamed (Ga-analogue of Epidote) | (CaCa)(AlAlGa3+)O[Si2O7][SiO4](OH) |
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Piemontite-(Pb) associated with Nežilovite | PbZn2Mn4+2Fe3+8O19 |
Related Minerals - Strunz-mindat Grouping
9.BG. | Shuiskite-(Cr) | Ca2Cr3+Cr3+2[Si2O6OH][SiO4](OH)2O |
9.BG. | Alnaperbøeite-(Ce) | Ca(Ce2.5Na0.5)(AlAl2Al)[Si2O7][SiO4]3O(OH)2 |
9.BG. | Magnesiovesuvianite | Ca19MgAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 |
9.BG. | Alumovesuvianite | Ca19AlAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
9.BG. | Zoisite-(Pb) | (CaPb)(AlAlAl)O[Si2O7][SiO4](OH) |
9.BG. | Vielleaureite-(Ce) | (Mn2+Ce)(MgAlMn2+)F[Si2O7][SiO4](OH) |
9.BG. | Heflikite | (CaCa)(AlAlSc)O[Si2O7][SiO4](OH) |
9.BG. | Zilbermintsite-(La) | (CaLa5)(Fe3+Al3Fe2+)[Si2O7][SiO4]5O(OH)3 |
9.BG.05b | Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
9.BG.05b | Allanite-(La) | (CaLa)(AlAlFe2+)O[Si2O7][SiO4](OH) |
9.BG.05b | Allanite-(Y) | (CaY)(AlAlFe2+)O[Si2O7][SiO4](OH) |
9.BG.05a | Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
9.BG.05b | Dissakisite-(Ce) | (CaCe)(AlAlMg)O[Si2O7][SiO4](OH) |
9.BG.05 | Dollaseite-(Ce) | (CaCe)(MgAlMg)F[Si2O7][SiO4](OH) |
9.BG.05a | Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
9.BG.05a | Hancockite | (CaPb)(AlAlFe3+)O[Si2O7][SiO4](OH) |
9.BG.05 | Khristovite-(Ce) | (CaCe)(MgAlMn2+)F[Si2O7][SiO4](OH) |
9.BG.05a | Mukhinite | (CaCa)(AlAlV3+)O[Si2O7][SiO4](OH) |
9.BG.05a | Piemontite | (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) |
9.BG.05 | Piemontite-(Sr) | (CaSr)(AlAlMn3+)O[Si2O7][SiO4](OH) |
9.BG.05b | Manganiandrosite-(La) | (Mn2+La)(Mn3+AlMn2+)O[Si2O7][SiO4](OH) |
9.BG.05 | Tweddillite | (CaSr)(Mn3+AlMn3+)O[Si2O7][SiO4](OH) |
9.BG.05b | Ferriallanite-(Ce) | (CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH) |
9.BG.05 | Niigataite | (CaSr)(AlAlAl)O[Si2O7][SiO4](OH) |
9.BG.05 | Manganiandrosite-(Ce) | (Mn2+Ce)(Mn3+AlMn2+)O[Si2O7][SiO4](OH) |
9.BG.05 | Dissakisite-(La) | (CaLa)(AlAlMg)O[Si2O7][SiO4](OH) |
9.BG.05 | Vanadoandrosite-(Ce) | (Mn2+Ce)(V3+AlMn2+)O[Si2O7][SiO4](OH) |
9.BG.05 | Uedaite-(Ce) | (Mn2+Ce)(AlAlFe2+)O[Si2O7][SiO4](OH) |
9.BG.05a | Epidote-(Sr) | (CaSr)(AlAlFe3+)O[Si2O7][SiO4](OH) |
9.BG.05b | Allanite-(Nd) | (CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH) |
9.BG.05b | Unnamed (Mg-analogue of Ferriallanite-(Ce)) | (CaCe)(Fe3+AlMg)O[Si2O7][SiO4](OH) |
9.BG.05b | Unnamed (Mn3+-analogue of Ferriakasakaite-(Ce)) | (CaCe)(Mn3+AlMn2+)O[Si2O7][SiO4](OH) |
9.BG.05b | Ferriallanite-(La) | (CaLa)(Fe3+AlFe2+)O[Si2O7][SiO4](OH) |
9.BG.05b | Åskagenite-(Nd) | (Mn2+Nd)(AlAlFe3+)O[Si2O7][SiO4]O |
9.BG.05b | Vanadoallanite-(La) | (CaLa)(V3+AlFe2+)O[Si2O7][SiO4](OH) |
9.BG.05b | Ferriakasakaite-(La) | (CaLa)(Fe3+AlMn2+)O[Si2O7][SiO4](OH) |
9.BG.05 | Ferriandrosite-(La) | (Mn2+La)(Fe3+AlMn2+)O[Si2O7][SiO4](OH) |
9.BG.05 | Androsite-(Ce) | (Mn2+Ce)(AlAlMn2+)O[Si2O7][SiO4](OH) |
9.BG.05 | Ferriandrosite-(Ce) | (Mn2+Ce)(Fe3+AlMn2+)O[Si2O7][SiO4](OH) |
9.BG.05a v | Unnamed (Ga-analogue of Epidote) | (CaCa)(AlAlGa3+)O[Si2O7][SiO4](OH) |
9.BG.05b | UM1989-32-SiO:AlCaFeHREE | (Ca0.5◻0.5REE)(AlAlFe3+)O[Si2O7][SiO4](OH) |
9.BG.05b | Manganiakasakaite-(La) | (CaLa)(Mn3+AlMn2+)O[Si2O7][SiO4](OH) |
9.BG.05b | Ferriakasakaite-(Ce) | (CaCe)(Fe3+AlMn2+)O[Si2O7][SiO4](OH) |
9.BG.05b | Allanite-(Sm) | (CaSm)(AlAlFe2+)O[Si2O7][SiO4](OH) |
9.BG.10 | Zoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
9.BG.15 | Macfallite | Ca2Mn3+3(SiO4)(Si2O7)(OH)3 |
9.BG.15 | Sursassite | Mn2+2Al3(SiO4)(Si2O7)(OH)3 |
9.BG.20 | Julgoldite-(Fe2+) | Ca2Fe2+Fe3+2[Si2O6OH][SiO4](OH)2(OH) |
9.BG.20 | Okhotskite | Ca2Mn2+Mn3+2[Si2O6OH][SiO4](OH)2(OH) |
9.BG.20 | Pumpellyite-(Fe2+) | Ca2Fe2+Al2(Si2O7)(SiO4)(OH,O)2 · H2O |
9.BG.20 | Pumpellyite-(Fe3+) | Ca2Fe3+Al2(Si2O7)(SiO4)(OH,O)2 · H2O |
9.BG.20 | Pumpellyite-(Mg) | Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O |
9.BG.20 | Pumpellyite-(Mn2+) | Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2O |
9.BG.20 | Shuiskite-(Mg) | Ca2MgCr3+2[Si2O6OH][SiO4](OH)2(OH) |
9.BG.20 | Julgoldite-(Fe3+) | Ca2Fe3+Fe3+2[Si2O6OH][SiO4](OH)2O |
9.BG.20 | Pumpellyite-(Al) | Ca2Al3(Si2O7)(SiO4)(OH,O)2 · H2O |
9.BG.20 | Poppiite | Ca2V3+V3+2[Si2O6OH][SiO4](OH)2O |
9.BG.20 | Julgoldite-(Mg) | Ca2MgFe3+2[Si2O6OH][SiO4](OH)2(OH) |
9.BG.25 | Ganomalite | Pb9Ca5Mn(Si2O7)4(SiO4)O |
9.BG.25 | Wayneburnhamite | Pb9Ca6(Si2O7)3(SiO4)3 |
9.BG.30 | Rustumite | Ca10(Si2O7)2(SiO4)(OH)2Cl2 |
9.BG.35 | Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
9.BG.35 | Wiluite | Ca19MgAl4(Al,Mg)8(B,◻)4◻[Si2O7]4[(SiO4)10]O(O,OH)9 |
9.BG.35 | Manganvesuvianite | Ca19Mn3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
9.BG.35 | Fluorvesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(F,OH)9 |
9.BG.35 | Cyprine | Ca19Cu2+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 |
9.BG.35 | Hongheite | Ca19Fe2+Al4(Fe3+,Mg)8(◻4)B[Si2O7]4[(SiO4)10]O(OH,O)9 |
9.BG.35 | Milanriederite | (Ca18[REE])Fe3+Al4(Mg4Al4)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 |
9.BG.35 | Manaevite-(Ce) | (Ca13Ce4[H2O]2)Mg(Al3Mg)(Mg3Ti3Fe3+2)(◻4)◻[Si2O7]4[(SiO4)8(H4O4)2]O(OH)9 |
9.BG.40 | Vyuntspakhkite-(Y) | (Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7 |
9.BG.45 | Dellaite | Ca6Si3O11(OH)2 |
9.BG.50 | Gatelite-(Ce) | CaCe3(AlAl2Mg)[Si2O7][SiO4]3O(OH)2 |
9.BG.50 | Perbøeite-(Ce) | CaCe3(AlAl2Fe2+)[Si2O7][SiO4]3O(OH)2 |
9.BG.50 | Ferriperbøeite-(Ce) | CaCe3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2 |
9.BG.50 | Ferriperbøeite-(La) | CaLa3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2 |
9.BG.50 | Perbøeite-(La) | CaLa3(AlAl2Fe2+)[Si2O7][SiO4]3O(OH)2 |
9.BG.55 | Västmanlandite-(Ce) | CaCe3(MgAl2Mg)[Si2O7][SiO4]3F(OH)2 |
9.BG.60 | Radekškodaite-(La) | (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 |
9.BG.60 | Radekškodaite-(Ce) | (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 |
9.BG.60 | Radekškodaite Group | (CaM5)([Fe3+Al3]Fe2+)[Si2O7][SiO4]5O(OH)3 |
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 Piemontite-(Pb)
mindat.org URL:
https://www.mindat.org/min-42876.html
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References for Piemontite-(Pb)
Localities for Piemontite-(Pb)
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).
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.
All localities listed without proper references should be considered as questionable.
North Macedonia | |
| Ermolaeva et al. (2017) +1 other reference |
| Bermanec et al. (1994) +3 other references |
Quick NavTopAbout Piemontite-(Pb)Unique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Mixed Series formation, Babuna Valley, Jakupica Mountains, Nežilovo, Čaška Municipality, North Macedonia