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Piemontite-(Pb)

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Flag of Piedmont, Italy
Formula:
{CaPb}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Colour:
purplish-red
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
4.282 (Calculated)
Crystal System:
Monoclinic
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).


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Classification of Piemontite-(Pb)Hide

Approved
Approval Year:
2011
First Published:
2012

Physical Properties of Piemontite-(Pb)Hide

Vitreous
Colour:
purplish-red
Streak:
pink
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
perfect on (001), and distinct on (010).
Density:
4.282 g/cm3 (Calculated)

Optical Data of Piemontite-(Pb)Hide

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.
Surface Relief:
Very High
Dispersion:
very strong, r>v.
Pleochroism:
Visible
Comments:
Z (red-brown)>Y (light red-brown)>X (light lilac)

Chemical Properties of Piemontite-(Pb)Hide

Formula:
{CaPb}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
IMA Formula:
CaPbAl2Mn3+[Si2O7][SiO4]O(OH)

Crystallography of Piemontite-(Pb)Hide

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)°
Ratio:
a:b:c = 1.573 : 1 : 1.811
Unit Cell V:
476.64 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.12(68)
4.67(53)
3.518(77)
2.931(100)
2.843(51)
2.736(57)
2.619(66)
2.122(46)

Type Occurrence of Piemontite-(Pb)Hide

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)Hide

Other Language Names for Piemontite-(Pb)Hide

Relationship of Piemontite-(Pb) to other SpeciesHide

Other Members of this group:
Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Epidote-(Sr){CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon.
Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)Mon.
Niigataite{CaSr}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m
Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon.
Tweddillite{CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m

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.

References for Piemontite-(Pb)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bermanec, V., Armbruster, T., Oberhänsli, R. (1994) Crystal chemistry of Pb- and REE-rich piemontite from Nezilovo, Macedonia. Schweizerische mineralogische und petrographische Mitteilungen: 74: 321-328.
Chukanov, N.V., Varlamov, D.A., Nestola, F., Belakovskiy, D., Goettlicher, J.,
Britvin, S., Lanza, A., Jancev, S. (2012) Piemontite-(Pb), IMA 2011-087. CNMNC Newsletter No. 12, February 2012, page 154; Mineralogical Magazine: 76: 151-155.
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.

Internet Links for Piemontite-(Pb)Hide

Localities for Piemontite-(Pb)Hide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Republic of Macedonia (TL)
 
  • Veles
    • Nežilovo
      • Jakupica Mts
        • Babuna Valley
Chukanov, N. V., Varlamov, D. A., Nestola, F., Belakovskiy, D. I., Goettlicher, J., Britvin, S. N., ... & 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
Mineral and/or Locality  
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