Mineralogy Database

Pyrosmalite-(Fe) Mineral Data

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General Pyrosmalite-(Fe) Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mn)8Si6O15(OH,Cl)10
Help on Composition: Composition: Molecular Weight = 1,053.90 gm
   Magnesium   0.23 %  Mg    0.38 % MgO
   Manganese   3.65 %  Mn    4.71 % MnO
   Iron       38.15 %  Fe   49.08 % FeO
   Silicon    15.99 %  Si   34.21 % SiO2
   Hydrogen    0.90 %  H     8.03 % H2O
   Chlorine    4.04 %  Cl    4.04 % Cl
                -   %   Cl   -0.91 % -O=Cl2   
   Oxygen     37.04 %  O
             ______        ______ 
             100.00 %       99.54 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+7.2Mn2+0.7Mg0.1Si6O15(OH)9.4Cl1.2
Help on Environment: Environment: Metamorphosed Pb-Zn deposit ores.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Nordmark in Vermland and at Dannemora, in Upsala, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Iron rich end member of pyrosmalite.
Help on Synonym: Synonym: Ferropyrosmalite - Renamed to Pyrosmalite-(Fe) by Mineralogical Record, v39 (2008), p 131

Pyrosmalite-(Fe) Image

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Comments: Crystal of ferropyrosmalite on clinochlore schist.
Location: Normark, Wermland, Sweden. Scale: Crystal size 1 cm.
© John Veevaert

Pyrosmalite-(Fe) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.53338
Help on Cell Dimensions: Cell Dimensions: a = 13.33, c = 7.11, Z = 2; V = 1,094.11 Den(Calc)= 3.20
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.675(1), 7.13(0.8), 3.564(0.6),

Physical Properties of Pyrosmalite-(Fe)

Help on Cleavage: Cleavage: {0001} Good
Help on Color: Color: Green blackish, Pale liver brown, Gray.
Help on Density: Density: 3.06 - 3.19, Average = 3.12
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light green

Optical Properties of Pyrosmalite-(Fe)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2063,KPDmeas= 0.2112,KC= 0.2135
Ncalc = 1.65 - 1.68
Help on Optical Data: Optical Data: Uniaxial (-), e=1.64, w=1.68, bire=0.0400.

Calculated Properties of Pyrosmalite-(Fe)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.05 gm/cc
note: Specific Gravity of Pyrosmalite-(Fe) =3.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPyrosmalite-(Fe) = 13.18 barns/electron
U=PEPyrosmalite-(Fe) x rElectron Density= 40.26 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pyrosmalite-(Fe) is Not Radioactive

Pyrosmalite-(Fe) Classification

Help on  Dana Class: Dana Class: 72.04.01a.01 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.04)with 4-, 6-, and 12-membered rings
  (72.04.01a)Pyrosmalite group (Pyrosmalite subgroup)
72.04.01a.01 Pyrosmalite-(Fe) (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m
72.04.01a.02 Pyrosmalite-(Mn) (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m
72.04.01a.03 Schallerite Mn16[AsO2OH][Si12O30](OH)14 P 3m1 ? 3m
Help on  Strunz Class: Strunz Class: 09.EE.10 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EE -Single tetrahedral nets of 6-membered rings
09.EE.10 Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 63mc 6mm
09.EE.10 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m
09.EE.10 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m
09.EE.10 Pyrosmalite-(Fe) (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m
09.EE.10 Pyrosmalite-(Mn) (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m

Other Pyrosmalite-(Fe) Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Bull.Miner.,Vol.107-111,1984-1988) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Pyrosmalite-(Fe) :
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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Dana No: 72.04.01a.01 Strunz No: 09.EE.10





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