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Piemontite

Pictures (46 Images total)

Piemontit
Views (File:
1315299328
): 2864
Piemontit
Größe: 1,02 mm; Fundort: Riveo, Maggiatal (Valle Maggia), Tessin, Schweiz
Copyright: Matteo Chinellato; Contribution: Hg
Collection: Domenico Preite
Location: Schweiz/Tessin, Kanton/Vallemaggia, Bezirk/Rovana, Kreis/Cevio/Pizzo Alzasca
Mineral: Piemontite
Image: 1315299328
Rating: 10 (votes: 1)
License: Usage for Mineralienatlas project only
Piemontit

Größe: 1,02 mm; Fundort: Riveo, Maggiatal (Valle Maggia), Tessin, Schweiz
Collection: Domenico Preite
Copyright: Matteo Chinellato
Contribution: Hg 2011-09-06
Locality: Pizzo Alzasca / Cevio / Rovana, Kreis / Vallemaggia, Bezirk / Tessin, Kanton / Schweiz
Piemontit
Views (File:
1384887042
): 3195, Rating: 7.78
Piemontit
Fundort: Rattenberg, Viechtach, Bayerischer Wald, Niederbayern, Bayern, Deutschland; visuell bestimmt; Bildbreite 0,43mm Leitz L25x/0.4
Copyright: Josef 84,55; Contribution: Josef 84,55
Collection: Josef 84,55
Location: Deutschland/Bayern/Niederbayern, Bezirk/Straubing-Bogen, Landkreis/Rattenberg (Niederbayern)
Mineral: Piemontite
Image: 1384887042
Rating: 7.78 (votes: 9)
License: Usage for Mineralienatlas project only
Piemontit

Fundort: Rattenberg, Viechtach, Bayerischer Wald, Niederbayern, Bayern, Deutschland; visuell bestimmt; Bildbreite 0,43mm Leitz L25x/0.4
Collection: Josef 84,55
Copyright: Josef 84,55
Contribution: Josef 84,55 2013-11-19
Locality: Rattenberg (Niederbayern) / Straubing-Bogen, Landkreis / Niederbayern, Bezirk / Bayern / Deutschland
Piemontit, Epidot
Views (File:
1220217845
): 4086
Piemontit, Epidot
Gneisbruch Linesco, Maggiatal, Tessin, Schweiz; BB 3 mm
Copyright: Hannes Osterhammer; Contribution: eschuhbauer
Collection: Lithothek der Münchener Micromounter, Collection number: A024964, Donator: eschuhbauer
Location: Schweiz/Tessin, Kanton/Vallemaggia, Bezirk/Rovana, Kreis/Linescio
Mineral: Piemontite
Image: 1220217845
Rating: 8 (votes: 3)
License: Creative Commons - Attribution (CC-BY) V.3.0
Piemontit, Epidot (SNr: A024964)

Gneisbruch Linesco, Maggiatal, Tessin, Schweiz; BB 3 mm
Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: eschuhbauer 2008-08-31
Locality: Linescio / Rovana, Kreis / Vallemaggia, Bezirk / Tessin, Kanton / Schweiz
Piemontit
Views (File:
1165232953
): 3209
Piemontit
Bildbreite: 7 mm; Fundort: Linescio, Maggiatal, Tessin, Schweiz
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Schweiz/Tessin, Kanton/Vallemaggia, Bezirk/Rovana, Kreis/Linescio
Mineral: Piemontite
Image: 1165232953
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Piemontit

Bildbreite: 7 mm; Fundort: Linescio, Maggiatal, Tessin, Schweiz
Copyright: Stephan Wolfsried
Contribution: Hg 2006-12-04
Locality: Linescio / Rovana, Kreis / Vallemaggia, Bezirk / Tessin, Kanton / Schweiz
Piemontit ~ Epidot xx
Views (File:
1315418968
): 1514
Piemontit ~ Epidot xx
Pizzo Alzasca Val Maggia Tessin Schweiz. BB=5,5mm.
Copyright: pilzpirat; Contribution: pilzpirat
Collection: pilzpirat
Location: Schweiz/Tessin, Kanton/Vallemaggia, Bezirk/Rovana, Kreis/Cevio/Pizzo Alzasca
Mineral: Piemontite
Image: 1315418968
Rating: 6.67 (votes: 3)
License: Usage for Mineralienatlas project only
Piemontit ~ Epidot xx

Pizzo Alzasca Val Maggia Tessin Schweiz. BB=5,5mm.
Collection: pilzpirat
Copyright: pilzpirat
Contribution: pilzpirat 2011-09-07
Locality: Pizzo Alzasca / Cevio / Rovana, Kreis / Vallemaggia, Bezirk / Tessin, Kanton / Schweiz

You find additional specimen at the Geolitho Museum

Collectors Summary

Color gelb, karmesinrot, rot, rötlichbraun, rötlich schwarz
Streak color rot
Hardness (Mohs) 6
Solubility + HF, - andere Säuren
Crystal System monoklin, P21/m

Chemism

Chemical formula

Ca2(Al,Mn,Fe)3[O|OH|SiO4|Si2O7]

Chemical composition

Aluminium, Calcium, Eisen, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 488.17850067 u; Number of atoms in the formula: 22

Info

Empirical formula:

Ca2(Al0.6Mn0.3Fe0.1)3[OOHSiO4Si2O7]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.21

1

4.55

1.0079470

1.0079470
Oxygen

O

42.61

13

59.09

15.9994300

207.9925900
Aluminium

Al

9.95

1.8

8.18

26.9815382

48.5667688
Silicon

Si

17.26

3

13.64

28.0855300

84.2565900
Calcium

Ca

16.42

2

9.09

40.0784000

80.1568000
Manganese

Mn

10.13

0.9

4.09

54.9380499

49.4442449
Iron

Fe

3.43

0.3

1.36

55.8452000

16.7535600

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.23-030

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

Classification by Hölzel

9.BN.160

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

Hey's Chemical Index of Minerals

16.16.22

16: Silicates Containing Aluminum and other Metals
16: Aluminosilicates of Mn

Dana 8th edition

58.02.01a.11

58: Sorosilicates Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
02: Sorosilicates Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n=1,2)
01a: Epidote group (Clinozoisite subgroup)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Epidote supergroup  ⇒ Epidote group

Optical Properties

Color

gelb, karmesinrot, rot, rötlichbraun, rötlich schwarz

Streak color

rot

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.060
Birefringence chart\! Piemontite title=Birefringence chart Piemontite

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

1.740

RI value β

1.766

RI value γ / ε

1.800

Ri mean

1.769

2V angle

Biaxial (+) 84°c

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

11

Space Group

P21/m

Cell parameters a (Å)

8.843

Cell parameters b (Å)

5.665

Cell parameters c (Å)

10.150

Cell parameters a/b or c/a

1.561

Cell parameters c/b

1.792

Cell parameters α

90°

Cell parameters β

115.25

Cell parameters γ

90°

Z

2

Volume (ų)

459.889

X-Ray Powder Diffraction

5.019(40),
3.996(50),
3.495(40),
2.903(100),
2.831(40),
2.690(40),
2.598(50),
2.407(50)
XRD chart Piemontite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6

VHN (Hardness Vickers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.4

3.525 ( ρ calc. Mineralienatlas )

Instability

+ HF, - andere Säuren

(Co-)Type locality

(Co-)Type locality

Italien/Aostatal (Valle d'Aosta), Region/Saint-Marcel/Mina Praborna

Preface

Occurrences

Manganreiche Metamorphite (z.B. Manganquarzite)

Author (Name, Year)

Kenngott, 1853

References

Short, Allan McIlroy, A chemical and optical study of Piedmontite from Shadow Lake, Madera County, California: American Mineralogist (1933) 18, 493-500.

Bermanec, V., Armbruster, T., Oberhänsli, R., and Zebec, V. (1994) Crystal chemistry of Pb- and REE-rich piemontite from Nezilovo, macedonia. Schweizerische mineralogische und petrographische Mitteilungen (1994) 74, 321-328.

Handbook of Mineralogy (Anthony et al.), 2 (1995), 648

IMA group assignments

 
Epidote supergroup
 
 
 

 
 
Epidote group
 
 
 

 
 
 
Clinozoisite
Ca2Al3[O|OH|SiO4|Si2O7]
monoklin
P21/m

 
 
 
Epidote
Ca2Fe3+Al2(Si2O7)(SiO4)O(OH)
monoklin
P21/m

 
 
 
Epidote-(Sr)
CaSrAl2Fe3+(Si2O7)(SiO4)O(OH)
monoklin
P21/m

 
 
 
Ferripiemontite ?
CaCaFe3+AlMn3+(Si3O12)(OH)
 
 

 
 
 
Ferripiemontite-(Pb) ?
CaPbFe3+AlMn3+(Si3O12)(OH)
 
 

 
 
 
Hancockite
CaPb(Al2Fe3+)[Si2O7][SiO4]O(OH)
monoklin
P21/m

 
 
 
Niigataite
CaSrAl3(Si2O7)(SiO4)O(OH)
monoklin
 

 
 
 
Piemontite
Ca2(Al,Mn,Fe)3[O|OH|SiO4|Si2O7]
monoklin
P21/m

 
 
 
Piemontite-(Pb)
CaPbAl2Mn3+[Si2O7][SiO4]O(OH)
monoklin
P21/m

 
 
 
Piemontite-(Sr)
(Ca,Mn2+)(Sr,Ca)Mn3+(Al,Fe3+)2(SiO4)(Si2O7)O(OH)
monoklin
P21/m

 
 
 
Tawmawite
Ca2(Al,Fe3+,Cr)3[O|OH|SiO4|Si2O7]
 
 

 
 
 
Tweddillite
CaSr(Mn3+,Fe3+)2Al[O|OH|SiO4|Si2O7]
 
 

 
 
 
Unnamed (Ga-dominant member of the epidote group) ?
CaCaAlAlGa(Si3O12)(OH)
 
 

 
 
 
Unnamed (possible Mn2+ analogue of uedaite-(Nd)) ?
Mn2+NdAlAlMn3+(Si3O12)O oder Mn2+NdAlAlMn2+(Si3O12)(OH)
 
 

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Actuality: 08. Oct 2024 - 21:35:52

Other languages

German

Piemontit

Spanish

Piemontita

French

Piemontite

English

Piemontite

Russian

Пьемонтит

Japanese

紅廉石

Simplified Chinese

红帘石

Alternative Name

French

Epidote Manganèsifère

English

Manganepidote

German

Piedmontit

Spanish

Piedmontita

English

Piedmontite

CNMNC symbol

Symbol

Pmt

Locations with GPS information

IDs

GUSID (Global unique identifier short form) S9AOPxBW_0ytj61DWzAwKw
GUID (Global unique identifier) 3F0ED04B-5610-4CFF-AD8F-AD435B30302B
Database ID 3051