Grunerite Mineral Data + Say GRUNERITE

General Grunerite Information
Help on Chemical Formula: Chemical Formula: [ ]Fe++7Si8O22(OH)2
Help on Composition: Composition: Molecular Weight = 1,001.61 gm
   Iron      39.03 %  Fe   50.21 % FeO
   Silicon   22.43 %  Si   47.99 % SiO2
   Hydrogen   0.20 %  H     1.80 % H2O
   Oxygen    38.34 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+7(Si8O22)(OH)2
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1853
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Louis Emmanuel Gruner (1809-1883), Swiss-French chemist who analyzed the mineral.
Help on Synonym: Synonym: Amosite
  ICSD 24590
  PDF 44-1401
 

Grunerite Image

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Grunerite

Comments: Olive green fibrous crystal aggregates of grunerite in rock matrix.
Location: Michigamme, Iron County, Michigan, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Grunerite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.5252:1:0.2925
Help on Cell Dimensions: Cell Dimensions: a = 9.57, b = 18.22, c = 5.33, Z = 2; beta = 102.1° V = 908.72 Den(Calc)= 3.66
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.33(1), 2.77(0.9), 3.07(0.8),
Click Here for Large Grunerite Structure Window Crystal Structure:

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Finger L W , Mineralogical Society of America Special Paper , 2 (1969) p.95-100, The crystal structure and cation distribution of a grunerite, Locality: Wabush iron formation, Labrador, Canada

 

Physical Properties of Grunerite

Help on Cleavage: Cleavage: [110] Perfect, [???] Distinct
Help on Color: Color: Ashen, Brown, Brownish green, Dark gray.
Help on Density: Density: 3.4 - 3.5, Average = 3.45
Help on Diaphaniety: Diaphaniety: Translucent to opaque
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: colorless
 

Optical Properties of Grunerite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1896,KPDmeas= 0.2011,KC= 0.2003
Help on Optical Data: Optical Data: Biaxial (-), a=1.663-1.686, b=1.68-1.709, g=1.696-1.729, bire=0.0330-0.0430, 2V(Calc)=84-86, 2V(Meas)=90-70. Dispersion r > v.
Help on Pleochroism (x): Pleochroism (x): colorless, colorless, or pale yellow.
Help on Pleochroism (y): Pleochroism (y): colorless, pale yellow, or yellowish gray.
Help on Pleochroism (z): Pleochroism (z): colorless, pale green, pale yellow, or pale greenish yellow.
 

Calculated Properties of Grunerite

Help on Electron Density: Electron Density:

relectron=3.36 gm/cc
note: rGrunerite =3.45 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01893
Boson Index = 0.98107
Help on Photoelectric: Photoelectric:

PEGrunerite = 12.52 barns/electron
U=PEGrunerite x relectron= 42.08 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Grunerite is Not Radioactive
 

Grunerite Classification
Help on Dana Class: Dana Class: 66.1.1.3 (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.07-30 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 Grunerite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Grunerite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - CalTech Mineral Spectroscopy 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 - HyperPhysics 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 - Minerals of Wisconsin 15 -QUT Mineral Atlas 16 - WWW-MINCRYST 17 -École des Mines de Paris

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Grunerite

[ ]Fe++7Si8O22(OH)2
Dana No: 66.1.1.3 Strunz No: VIII/F.07-30
Locality:

 

Notes:

 
 
   
 
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