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Pumpellyite-(Mg) Mineral Data

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General Pumpellyite-(Mg) Information

Help on Chemical  Formula: Chemical Formula: Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O)
Help on Composition: Composition: Molecular Weight = 470.70 gm
   Calcium    17.03 %  Ca   23.83 % CaO
   Magnesium   5.16 %  Mg    8.56 % MgO
   Aluminum   11.46 %  Al   21.66 % Al2O3
   Silicon    17.90 %  Si   38.29 % SiO2
   Hydrogen    0.86 %  H     7.65 % H2O
   Oxygen     47.59 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O)
Help on Environment: Environment: Meta-basalt or gabbroic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1925
Help on Locality: Locality: Calumet mine, Houghton County, Keweenaw Peninisula, Michigan, USA. 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-(Mg) + Pronunciation Say PUMPELLYITE-(MG)
Help on Synonym: Synonym: Pumpellyite
 

Pumpellyite-(Mg) Image

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  Pumpellyite-(Mg)

Comments: Greenish, flattened, prismatic crystals of pumpellyite-(Mg) ? to 3mm.
Location: Deere Island, Novato, Marin Co., California, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Pumpellyite-(Mg) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.4939:1:3.2384
Help on Cell Dimensions: Cell Dimensions: a = 8.82, b = 5.904, c = 19.12, Z = 4; beta = 97.4° V = 987.35 Den(Calc)= 3.17
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): 2.9(1), 2.74(0.5), 3.79(0.5),
 

Physical Properties of Pumpellyite-(Mg)

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: 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 Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Pumpellyite-(Mg)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2182,KPDmeas= 0.2161,KC= 0.2177
Ncalc = 1.69 - 1.7
Help on Optical Data: Optical Data: Biaxial (+), a=1.67-1.698, b=1.672-1.706, g=1.684-1.72, bire=0.0140-0.0220, 2V(Calc)=46-76, 2V(Meas)=10-50. Dispersion relatively strong.
 

Calculated Properties of Pumpellyite-(Mg)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.18 gm/cc
note: Specific Gravity of Pumpellyite-(Mg) =3.17 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPumpellyite-(Mg) = 3.23 barns/electron
U=PEPumpellyite-(Mg) x rElectron Density= 10.27 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pumpellyite-(Mg) is Not Radioactive
 

Pumpellyite-(Mg) Classification

Help on  Dana Class: Dana Class: 58.02.02.07 (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-(Mg) Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Pumpellyite-(Mg) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Franklin Minerals(Dunn)
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Pumpellyite-(Mg)

Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O)
Dana No: 58.02.02.07 Strunz No: 09.BG.20
Locality:

 

Notes:

 

 
   
 


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