Magnesiocummingtonite Mineral Data


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General Magnesiocummingtonite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Fe++)7Si8O22(OH)2
Help on Composition: Composition: Molecular Weight = 836.02 gm
   Magnesium  15.26 %  Mg   25.31 % MgO
   Iron       11.69 %  Fe   15.04 % FeO
   Silicon    26.88 %  Si   57.50 % SiO2
   Hydrogen    0.24 %  H     2.15 % H2O
   Oxygen     45.93 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg5.25Fe2+1.75Si8O22(OH)2
Help on IMA Status: IMA Status: Approved IMA 1969
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Synonym: Synonym: ICSD 41925
  PDF 17-727
 

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Magnesiocummingtonite Crystallography

Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
 

Physical Properties of Magnesiocummingtonite

Help on Cleavage: Cleavage: [110] Good
Help on Color: Color: Brown, Gray green, White, Light gray, Dark green.
Help on Density: Density: 3.13
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Silky
Help on Streak: Streak: white
 

Optical Properties of Magnesiocummingtonite

Help on Optical Data: Optical Data: NCalc= 1.64 - from Gladstone-Dale relationship (KC = 0.2058) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Magnesiocummingtonite

Help on Electron Density: Electron Density:

relectron=3.10 gm/cc
note: rMagnesiocummingtonite =3.13 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.03051
Boson Index = 0.96949
Help on Photoelectric: Photoelectric:

PEMagnesiocummingtonite = 4.81 barns/electron
U=PEMagnesiocummingtonite x relectron= 14.92 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesiocummingtonite is Not Radioactive

 

Magnesiocummingtonite Classification

Help on  Dana Class: Dana Class: 66.1.1.1 (66)Inosilicate Double-Width Unbranched Chains, W=2
  (66.1)Dana Type
  (66.1.1)Group 1, the Mg-Fe-Mn-Li amphiboles (Monoclinic)
 
66.1.1.1 Magnesiocummingtonite (Mg,Fe)7Si8O22(OH)2 C 2/m 2/m
 
66.1.1.2 Cummingtonite []Mg7Si8O22(OH)2 C 2/m 2/m
 
66.1.1.3 Grunerite []Fe7Si8O22(OH)2 C 2/m 2/m
 
66.1.1.3b Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m
 
66.1.1.4 Manganocummingtonite Na(Na,Mn)2(Mg4,Fe)5Si8O22(OH)2 C 2/m 2/m
 
66.1.1.5 Manganogrunerite []Mn2Fe5Si8O22(OH) C 2/m 2/m
 
66.1.1.6 Magnesioclinoholmquistite? Li2(Mg,Fe)3Al2Si8O22(OH)2 C 2/m 2/m
 
66.1.1.7 Clinoholmquistite? [](Li2Mg3Al2)Si8O22(OH)2 C 2/m 2/m
 
66.1.1.8 Clinoferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 C 2/m 2/m
 
66.1.1.8a Ferri-clinoholmquistite! []Li2Mg3(Fe3)2(Si8O22)(OH)2 C 2/m 2/m
 
66.1.1.8b Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m
 
66.1.1.9 Sodic-ferripedrizite! Na(LiNa)(Fe2Mg2Li)Si8O22(OH,F)2 C 2/m 2/m
 
66.1.1.9a Ferripedrizite! NaLi2(Fe2Mg2Li)Si8O22(OH)2 C 2/m 2/m
 
66.1.1.9b Sodic-ferri-ferropedrizite! NaLi2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m
 
66.1.1.9c Fluoro-sodic-pedrizite! NaLi2(Mg2Al2Li)S5Si8O22F2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: VIII/F.07-10 VIII - Silicates
  VIII/F - Inosilicates (chain and band) double chains [Si4O11]6- , Mg-Fe-Mn-Amphiboles
  VIII/F.07 - Amphibole group, Magnesiocummingtonite - Ferroclinoholmquistite series
 
VIII/F.07-10 Magnesiocummingtonite (Mg,Fe)7Si8O22(OH)2 C 2/m 2/m
 
VIII/F.07-20 Cummingtonite []Mg7Si8O22(OH)2 C 2/m 2/m
 
VIII/F.07-30 Grunerite []Fe7Si8O22(OH)2 C 2/m 2/m
 
VIII/F.07-40 Manganocummingtonite Na(Na,Mn)2(Mg4,Fe)5Si8O22(OH)2 C 2/m 2/m
 
VIII/F.07-50 Manganogrunerite []Mn2Fe5Si8O22(OH) C 2/m 2/m
 
VIII/F.07-55 Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m
 
VIII/F.07-60 Magnesioclinoholmquistite? Li2(Mg,Fe)3Al2Si8O22(OH)2 C 2/m 2/m
 
VIII/F.07-70 Clinoholmquistite? [](Li2Mg3Al2)Si8O22(OH)2 C 2/m 2/m
 
VIII/F.07-80 Clinoferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 C 2/m 2/m
 
VIII/F.07-90 Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m
 

Other Magnesiocummingtonite Information

Help on See Also: See Also: Links to other databases for Magnesiocummingtonite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (MinSocAm) 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Magnesiocummingtonite Specimen Label here :

Magnesiocummingtonite

(Mg,Fe++)7Si8O22(OH)2
Dana No: 66.1.1.1 Strunz No: VIII/F.07-10
Locality:

 

Notes:

 

 
   
 
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