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Pumpellyite-(Mn++) Mineral Data

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General Pumpellyite-(Mn++) Information

Help on Chemical  Formula: Chemical Formula: Ca2(Mn++,Mg)(Al,Mn+++,Fe)2(SiO4)(Si2O7(OH)2•(H2O)
Help on Composition: Composition: Molecular Weight = 504.86 gm
   Calcium    15.88 %  Ca   22.22 % CaO
   Magnesium   1.20 %  Mg    2.00 % MgO
   Manganese  16.32 %  Mn   10.54 % MnO / 11.73 % Mn2O3
   Aluminum    5.34 %  Al   10.10 % Al2O3
   Iron        2.77 %  Fe    3.95 % Fe2O3
   Silicon    16.69 %  Si   35.70 % SiO2
   Hydrogen    0.60 %  H     5.35 % H2O
   Oxygen     41.20 %  O
             ______        ______ 
             100.00 %      101.58 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Mn2+0.75Mg0.25AlMn3+0.75Fe3+0.25(SiO4)(Si2O7)(OH)�(H2O)
Help on Environment: Environment: Metamorphosed Mn-oxides in pelitic and dolomitic rocks.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Ochiai mine, Barazawa, Kohsai-cho, Yamanashi Prefecture, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the American geologist, R. Pumpelly (1837-1923).
Help on Name Pronunciation: Name Pronunciation: Pumpellyite-(Mn++) + Pronunciation Say PUMPELLYITE-(MN++)
 

Pumpellyite-(Mn++) Image

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  Pumpellyite-(Mn++)

Comments: BSE image of pumpellyite-(Mn++) (P) intercleaved with phlogopite (black) between braunite (white) and calcite (C).
Location: Mn oxide ores from the Precambrian Sausar Group, India. (AmMin, v76:241). Scale: Scale Bar 0.01 cm.
© American Mineralogist

Pumpellyite-(Mn++) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.4884:1:3.1953
Help on Cell Dimensions: Cell Dimensions: a = 8.923, b = 5.995, c = 19.156, Z = 4; beta = 97.8° V = 1,015.24 Den(Calc)= 3.30
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.93(1), 2.725(0.9), 4.75(0.65),2.65(0.55), 2.53(0.5), 2.2(0.45), 4.43(0.35),
 

Physical Properties of Pumpellyite-(Mn++)

Help on Cleavage: Cleavage: {001} Good, {100} Good
Help on Color: Color: Blue green, Olive green, Brown.
Help on Density: Density: 3.2
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Massive - Lamellar - Distinctly foliated fine-grained forms.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Pumpellyite-(Mn++)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.051 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2371,KPDmeas= 0.2445,KC= 0.2325
Ncalc = 1.74 - 1.77
Help on Optical Data: Optical Data: Biaxial (+), a=1.752, b=1.795, g=1.8, bire=0.0480, 2V(Calc)=36, 2V(Meas)=40-50.
 

Calculated Properties of Pumpellyite-(Mn++)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.26 gm/cc
note: Specific Gravity of Pumpellyite-(Mn++) =3.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0099967154
Boson Index = 0.9900032846
Help on Photoelectric: Photoelectric: PEPumpellyite-(Mn++) = 7.71 barns/electron
U=PEPumpellyite-(Mn++) x rElectron Density= 25.11 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pumpellyite-(Mn++) is Not Radioactive
 

Pumpellyite-(Mn++) Classification

Help on  Dana Class: Dana Class: 58.02.02.08 (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)
  (58.02.02)Pumpellyite group
 
58.02.02.01 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2•(H2O) C 2/m 2/m
 
58.02.02.02 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2•(H2O) A2/m 2/m
 
58.02.02.03 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2•(H2O) Mono
 
58.02.02.04 Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m
 
58.02.02.05 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m
 
58.02.02.06 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2•(H2O) A2/m 2/m
 
58.02.02.07 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m
 
58.02.02.08 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2•(H2O) A2/m 2/m
 
58.02.02.09 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m
 
58.02.02.10 Poppiite! Ca2(V,Fe,Mg)(V,Al)2(Si,Al)3(O,OH)14 C 2/m 2/m
 
58.02.02.11 Pumpellyite-(Al)! Ca2(Al,Fe,Mg)Al2(SiO4)(Si2O7)(OH,O)2•H2O A2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BG.20 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;
 
09.BG.20 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2•(H2O) C 2/m 2/m
 
09.BG.20 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2•(H2O) A2/m 2/m
 
09.BG.20 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m
 
09.BG.20 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2•(H2O) Mono
 
09.BG.20 Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m
 
09.BG.20 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2•(H2O) A2/m 2/m
 
09.BG.20 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m
 
09.BG.20 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2•(H2O) A2/m 2/m
 
09.BG.20 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m
 
09.BG.20 Pumpellyite-(Al)! Ca2(Al,Fe,Mg)Al2(SiO4)(Si2O7)(OH,O)2•H2O A2/m 2/m
 
09.BG.20 Poppiite! Ca2(V,Fe,Mg)(V,Al)2(Si,Al)3(O,OH)14 C 2/m 2/m
 

Other Pumpellyite-(Mn++) Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Pumpellyite-(Mn++) :
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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Print or Cut-and-Paste your Pumpellyite-(Mn++) Specimen Label here :

Pumpellyite-(Mn++)

Ca2(Mn++,Mg)(Al,Mn+++,Fe)2(SiO4)(Si2O7(OH)2•(H2O)
Dana No: 58.02.02.08 Strunz No: 09.BG.20
Locality:

 

Notes:

 

 
   
 


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