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Piemontite-(Sr) (Piemontit-(Sr))

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Piemontit-(Sr)
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Piemontit-(Sr)
Bildbreite: 6 mm, Fundort: Miniera Valgraveglia (Miniera Gambatesa), Reppia, Val Graveglia, Ne, Genova, Ligurien (Liguria), Italien.
Copyright: Luigi Chiappino; Contribution: thdun5
Location: Italien/Ligurien (Liguria), Region/Genua (Genova), Metropolitanstadt/Ne/Val Graveglia/Reppia/Miniera Valgraveglia (Gambatesa)
Mineral: Piemontite-(Sr)
Image: 1271608308
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Piemontit-(Sr)

Bildbreite: 6 mm, Fundort: Miniera Valgraveglia (Miniera Gambatesa), Reppia, Val Graveglia, Ne, Genova, Ligurien (Liguria), Italien.

Copyright: Luigi Chiappino
Contribution: thdun5 2010-04-18
Locality: Miniera Valgraveglia (Gambatesa) / Reppia / Val Graveglia / Ne / Genua (Genova), Metropolitanstadt / Ligurien (Liguria), Region / Italien

Collectors Summary

Color dunkelrot
Streak color purpurfarben braun
Hardness (Mohs) 6
Cleavages vollkommen {001}
Crystal System monoklin, P21/m

Additional information / Summary

(ehemals Strontiopiemontit)

Chemism

Chemical formula

(Ca,Mn2+)(Sr,Ca)Mn3+(Al,Fe3+)2(SiO4)(Si2O7)O(OH)

Chemical composition

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

Unit weight: 536.118746675 u; Number of atoms in the formula: 22

Info

Empirical formula:

(Ca0.75Mn0.25)(Sr0.75Ca0.25)Mn(Al0.75Fe0.25)2(SiO4)(Si2O7)O(OH)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.19

1

4.55

1.0079470

1.0079470

Oxygen

O

38.80

13

59.09

15.9994300

207.9925900

Aluminium

Al

7.55

1.5

6.82

26.9815382

40.4723073

Silicon

Si

15.72

3

13.64

28.0855300

84.2565900

Calcium

Ca

7.48

1

4.55

40.0784000

40.0784000

Manganese

Mn

12.81

1.25

5.68

54.9380499

68.6725624

Iron

Fe

5.21

0.5

2.27

55.8452000

27.9226000

Strontium

Sr

12.26

0.75

3.41

87.6210000

65.7157500

Analysis wt%

Ø CaO : 11.69, SrO : 13.45, Al2O3 : 17.56, Fe2O3 : 4.89, Mn2O3 : 12.93, SiO2 : 34.27, MnO : 2.87, H2O : 1.72 (Ref: European Journal of Mineralogy 90)

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.23-032

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

Classification by Hölzel

9.BN.163

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

IMA status

anerkannt, von einer IMA Subkomission umbenannt von Strontiopiemontit nach Piemontit-(Sr)

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Epidote supergroup  ⇒ Epidote group

Optical Properties

Color

dunkelrot

Streak color

purpurfarben braun

Diaphaneity (Transparency)

transparent

RI value α / ω / n

1.763

Ri mean

1.763

2V angle

Biaxial (+) nd

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

11

Space Group

P21/m

Cell parameters a (Å)

8.862

Cell parameters b (Å)

5.682

Cell parameters c (Å)

10.191

Cell parameters a/b or c/a

1.560

Cell parameters c/b

1.794

Cell parameters α

90°

Cell parameters β

114.70

Cell parameters γ

90°

Z

2

Volumne (ų)

466.207

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)

3.65 - 3.73 / Durchschnittlich = 3.69

3.819 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {001}

IMA group assignments


 
 
 
 
 

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

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

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

 
 
 
CaCaFe3+AlMn3+(Si3O12)(OH)
 
 

 
 
 
CaPbFe3+AlMn3+(Si3O12)(OH)
 
 

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

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

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

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

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

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

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

 
 
 
CaCaAlAlGa(Si3O12)(OH)
 
 

 
 
 
Mn2+NdAlAlMn3+(Si3O12)O oder Mn2+NdAlAlMn2+(Si3O12)(OH)
 
 

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Actuality: 22. Sep 2022 - 09:41:41

Other languages

Spanish

Estronciopiemontita

German

Piemontit-(Sr)

English

Piemontite-(Sr)

French

Strontiopiemontite

Russian

Пьемонтит-(Sr)

Russian

Стронциопьемонтит

Japanese

ストロンチウム紅簾石

Alternative Name

Strontiopiemontit

Spanish

Strontiopiemontita

Strontiopiemontite

English

Strontiopiemontite

CNMNC (IMA)-Number

IMA 1989-031

CNMNC symbol

Symbol

Pmt-Sr

Locations with GPS information