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Piemontite-(Sr) Mineral Data

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General Piemontite-(Sr) Information

Help on Chemical  Formula: Chemical Formula: (Ca,Mn++)(Sr,Ca)Mn+++(Al,Mn+++,Fe+++)2(SiO4)(Si2O7)O(OH)
Help on Composition: Composition: Molecular Weight = 524.43 gm
   Strontium  11.70 %  Sr   13.83 % SrO
   Calcium     8.41 %  Ca   11.76 % CaO
   Manganese  11.52 %  Mn    2.71 % MnO / 13.55 % Mn2O3
   Aluminum    9.26 %  Al   17.50 % Al2O3
   Iron        3.19 %  Fe    4.57 % Fe2O3
   Silicon    16.07 %  Si   34.37 % SiO2
   Hydrogen    0.19 %  H     1.72 % H2O
   Oxygen     39.66 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.8Mn2+0.2Sr0.7Ca0.3Al1.8Mn3+0.9Fe3+0.3Si3O12(OH)
Help on Environment: Environment: As veinlets in a low-temperature metamorphosed manganese ore deposit.
Help on IMA Status: IMA Status: Approved IMA 1990 - Dana # changed from 58.2.1a.12
Help on Locality: Locality: From the Molinello and Cassagna manganese mines, near Chiavari, Val Graveglia, Liguria, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From its strontium content and similarity to piemontite.
Help on Name Pronunciation: Name Pronunciation: Piemontite-(Sr) + Pronunciation Say PIEMONTITE-(SR)
Help on Synonym: Synonym: IMA1989-031
  Strontiopiemontite - Renamed to Piemontite-(Sr) - Recommended nomenclature of epidote-group minerals, Eur. J. Mineral. 2006, 18, 551-567.
 

Piemontite-(Sr) Image

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  Piemontite-(Sr)

Comments: Carmine red crystals of piemontite-(Sr) found on quartz.
Location: Graveglia, Piemont, Italy. Scale: See Image.
© Rruff Database

Piemontite-(Sr) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5596:1:1.7935
Help on Cell Dimensions: Cell Dimensions: a = 8.862, b = 5.682, c = 10.191, Z = 2; beta = 114.7° V = 466.21 Den(Calc)= 3.74
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.916(1), 2.936(0.5), 3.493(0.5),
 

Physical Properties of Piemontite-(Sr)

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Dark red.
Help on Density: Density: 3.65 - 3.73, Average = 3.69
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: purple brown
 

Optical Properties of Piemontite-(Sr)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.068 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.204,KPDmeas= 0.2068,KC= 0.2188
Ncalc = 1.8 - 1.82
Help on Optical Data: Optical Data: Biaxial (+), b=1.763
Help on Pleochroism (x): Pleochroism (x): orange yellow.
Help on Pleochroism (y): Pleochroism (y): violet.
Help on Pleochroism (z): Pleochroism (z): reddish violet.
 

Calculated Properties of Piemontite-(Sr)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.58 gm/cc
note: Specific Gravity of Piemontite-(Sr) =3.69 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPiemontite-(Sr) = 18.61 barns/electron
U=PEPiemontite-(Sr) x rElectron Density= 66.58 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Piemontite-(Sr) is Not Radioactive
 

Piemontite-(Sr) Classification

Help on  Dana Class: Dana Class: 58.02.01a.06 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)
  (58.02.01a)Epidote group (Clinozoisite subgroup)
 
58.02.01a.01 Clinozoisite! Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.02.01a.02 Epidote! Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.02.01a.03 Epidote-(Pb)! (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.02.01a.04 Mukhinite Ca2Al2V(SiO4)3(OH) P 21/m 2/m
 
58.02.01a.05 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.02.01a.06 Piemontite-(Sr)! (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.02.01a.07 Manganipiemontite-(Sr)! CaSr(Mn,Fe)2Al[Si3O12](OH) P 21/m 2/m
 
58.02.01a.08 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 21/a 2/m
 
58.02.01a.09 Clinozoisite-(Sr)! CaSrAl3(Si2O7)(SiO4)O(OH) P 21/m 2/m
 
58.02.01a.10 Uedaite-(Ce)! MnCeAl2Fe(Si2O7)(SiO4)O(OH) P 21/m 2/m
 
58.02.01a.11 Epidote-(Sr)! CaSrAl2Fe(Si2O7)(SiO4)O(OH) P 21/m 2/m
Help on  Strunz Class: Strunz Class: 09.BG.05a 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;
 
09.BG.05a Clinozoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
09.BG.05a Epidote Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
09.BG.05a Epidote-(Pb) (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
09.BG.05a Mukhinite Ca2Al2V(SiO4)3(OH) P 21/m 2/m
 
09.BG.05a Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
09.BG.05a Piemontite-(Sr)! (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
09.BG.05a Manganipiemontite-(Sr)! CaSr(Mn,Fe)2Al[Si3O12](OH) P 21/m 2/m
 
09.BG.05a Clinozoisite-(Sr)! CaSrAl3(Si2O7)(SiO4)O(OH) P 21/m 2/m
 
09.BG.05a Epidote-(Sr)! CaSrAl2Fe(Si2O7)(SiO4)O(OH) P 21/m 2/m
 

Other Piemontite-(Sr) Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.76,p668,1991) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Piemontite-(Sr) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Piemontite-(Sr)

(Ca,Mn++)(Sr,Ca)Mn+++(Al,Mn+++,Fe+++)2(SiO4)(Si2O7)O(OH)
Dana No: 58.02.01a.06 Strunz No: 09.BG.05a
Locality:

 

Notes:

 

 
   
 


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