Mineralogy Database

Pyrosmalite-(Mn) Mineral Data

Search Webmineral :

General Pyrosmalite-(Mn) Information

Help on Chemical  Formula: Chemical Formula: (Mn,Fe++)8Si6O15(OH,Cl)10
Help on Composition: Composition: Molecular Weight = 1,071.52 gm
   Manganese  29.74 %  Mn   38.40 % MnO
   Iron        9.38 %  Fe   12.07 % FeO
   Silicon    15.73 %  Si   33.64 % SiO2
   Hydrogen    0.56 %  H     5.04 % H2O
   Chlorine   13.23 %  Cl   13.23 % Cl
                -   %   Cl   -2.99 % -O=Cl2   
   Oxygen     31.36 %  O
             ______        ______ 
             100.00 %       99.40 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+5.8Fe2+1.8Si6O15(OH)6Cl4
Help on Environment: Environment: Metamorphosed iron and manganese ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1953
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: Manganese end member of pyrosmalite.
Help on Synonym: Synonym: Brokenhillite
  Manganpyrosmalite - Renamed to Pyrosmalite-(Mn) by Mineralogical Record, v39 (2008), p 131

Pyrosmalite-(Mn) Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: Greenish brown, blocky crystals of manganpyrosmalite in matrix. Individual crystals are up to 7 mm long.
Location: Nordmark, Varmland, Sweden. Scale: Picture size 5 cm.
© John Veevaert

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: Hexagonal, light brown crystals of manganpyrosmalite.
Location: Nordmark, Filipstad, Varmland, Sweden. Scale: Crystal size 1.5 mm.
© Tom Loomis / Dakota Matrix

Pyrosmalite-(Mn) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.53592
Help on Cell Dimensions: Cell Dimensions: a = 13.36, c = 7.16, Z = 2; V = 1,106.77 Den(Calc)= 3.22
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): 7.16(1), 2.683(0.9), 3.583(0.8),

Physical Properties of Pyrosmalite-(Mn)

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: brownish yellow

Optical Properties of Pyrosmalite-(Mn)

Help on Dichroism (e): Dichroism (e): colorless.
Help on Dichroism (w): Dichroism (w): pistachio green.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.071 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.205,KPDmeas= 0.2112,KC= 0.2273
Ncalc = 1.7 - 1.73
Help on Optical Data: Optical Data: Uniaxial (-), e=1.64, w=1.68, bire=0.0400.

Calculated Properties of Pyrosmalite-(Mn)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.02 gm/cc
note: Specific Gravity of Pyrosmalite-(Mn) =3.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0094844898
Boson Index = 0.9905155102
Help on Photoelectric: Photoelectric: PEPyrosmalite-(Mn) = 11.92 barns/electron
U=PEPyrosmalite-(Mn) x rElectron Density= 36.00 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pyrosmalite-(Mn) is Not Radioactive

Pyrosmalite-(Mn) Classification

Help on  Dana Class: Dana Class: 72.04.01a.02 (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-(Mn) Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Pyrosmalite-(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

Search for Pyrosmalite-(Mn) using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Pyrosmalite-(Mn) :

Ask about Pyrosmalite-(Mn) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

Print or Cut-and-Paste your Pyrosmalite-(Mn) Specimen Label here :


Dana No: 72.04.01a.02 Strunz No: 09.EE.10





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.