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Piemontite-(Pb) (Piemontit-(Pb))

Additional Functions

Collectors Summary

Crystal System monoklin, P21/m

Chemism

Chemical formula

CaPbAl2Mn3+[Si2O7][SiO4]O(OH)

Additional chem. information

Epidot-Gruppe

Chemical composition

Aluminium, Blei, Calcium, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 649.4466533 u; Number of atoms in the formula: 22

Info

Empirical formula:

CaPbAl2Mn[Si2O7][SiO4]O(OH)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.16

1

4.55

1.0079470

1.0079470

Oxygen

O

32.03

13

59.09

15.9994300

207.9925900

Aluminium

Al

8.31

2

9.09

26.9815382

53.9630764

Silicon

Si

12.97

3

13.64

28.0855300

84.2565900

Calcium

Ca

6.17

1

4.55

40.0784000

40.0784000

Manganese

Mn

8.46

1

4.55

54.9380499

54.9380499

Lead

Pb

31.91

1

4.55

207.2100000

207.2100000

Analysis wt%

SiO2 : 28.90, Al2O3 : 14.04, Fe2O3 : 8.75, Mn2O3 : 8.61, PbO : 26.34, CaO : 11.86, H2O : 1.47 (Ref: Neues Jahrbuch für Mineralogie, (Monatshefte) A2012)

Strunz 9th edition incl. updates

9.BG.05

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
G: Gruppen(Soro)-Silikate mit gemischten SiO4 und Si2O7 Gruppen; Kationen in oktahedraler [6] und größerer Koordination
05:Epidot-Gruppe

Lapis Classification

VIII/C.23-038

VIII: SILIKATE
C: Gruppensilikate
23: Mischstrukturen mit [SiO4] 4--Inseln und [Si2O7] 6--Gruppen; Epidot-Gruppe

Classification by Hölzel

9.BN.165

9: SILICATES
B: Sorosilicates
N: With SiO4 + Si2O7
1: Clinozoisite-Group

IMA status

anerkannt - CNMNC - Neue Mineralien Dezember 2011

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Epidote supergroup  ⇒ Epidote group

Optical Properties

max. Birefringence

0.060

Birefringence chart\! Piemontite-(Pb) title=Birefringence chart Piemontite-(Pb)

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.835

RI value β

1.885

RI value γ / ε

1.895

Ri mean

1.872

2V angle

b - 35°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

11

Space Group

P21/m

Cell parameters a (Å)

8.880

Cell parameters b (Å)

5.681

Cell parameters c (Å)

10.166

Cell parameters a/b or c/a

1.563

Cell parameters c/b

1.789

Cell parameters α

90°

Cell parameters β

114.67

Cell parameters γ

90°

Z

2

Volumne (ų)

466.038

Kristall structure

Struktur bestimmt

X-Ray Powder Diffraction

8.12(68), 4.67(53), 3.518(77), 2.931(100), 2.843(51), 2.736(57), 2.619(66), 2.122(46)

XRD chart Piemontite-(Pb)

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

4.628 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Nordmazedonien/Čaška, Opština/Nežilovo/Babuna-Tal/Gemischte Serienformation (Mixed Series formation)

Type material

Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia

Collection number of type material

4193/1

Preface

Author (Name, Year)

Chukanov, N.V., Varlamov, D.A., Nestola, F., Belakovskiy, D., Goettlicher, J., Britvin, S., Lanza, A. and Jancev, S. (2012)

References

CNMNC Newsletter No. 12, February 2012, page 152; Mineralogical Magazine, 76, 151-155.

IMA group assignments

Other languages

German

Piemontit-(Pb)

English

Piemontite-(Pb)

CNMNC (IMA)-Number

IMA 2011-087

CNMNC symbol

Symbol

Pmt-Pb