Mineralogy Database

Strontiomelane Mineral Data

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General Strontiomelane Information

Help on Chemical  Formula: Chemical Formula: SrMn++++6Mn+++2O16
Help on Composition: Composition: Molecular Weight = 783.11 gm
   Strontium  11.19 %  Sr   13.23 % SrO
   Manganese  56.12 %  Mn   20.16 % Mn2O3 / 66.61 % MnO2
   Oxygen     32.69 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: SrMn4+6Mn3+2O16
Help on Environment: Environment: Post-Alpine stage of veining. Sr end-member of the cryptomelane group.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Found at the Praborna manganese mine, near Saint-Marcel, Aosta Valley, Italian Alps. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: The name reflects the presence of strontium and the black color, melanos in Greek.
Help on Synonym: Synonym: IMA1995-005

Strontiomelane Image

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Comments: BSE image of strontiomelane. (CanMin, v37:673).
Location: Praboma mine near Saint-Marcel, Aosta Valley, Italian Alps, Italy. Scale: Scale Bar 100 µm.
© Canadian Mineralogist

Strontiomelane Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7367:1:1.7158
Help on Cell Dimensions: Cell Dimensions: a = 10, b = 5.758, c = 9.88, Z = 2; beta = 90.64° V = 568.85 Den(Calc)= 4.57
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.15(1)(103), 3.13(0.8)(103), 2.409(0.8)(122),2.17(0.6)(320), 1.556(0.5)(225),

Physical Properties of Strontiomelane

Help on Cleavage: Cleavage: {???} Distinct
Help on Color: Color: Black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 4-4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: sepia brown

Optical Properties of Strontiomelane

Help on Optical Data: Optical Data: NCalc= 2.56 - from Gladstone-Dale relationship (KC = 0.3423) where Ncalc=Dcalc*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Moderate, from gray-blue to white.
Help on RL Color: RL Color: Gray color in oil.
Help on RL Pleochroism: RL Pleochroism: Strong gray-white in oil.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Strontiomelane in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   34.20   26.00 
 543 nm   31.70   24.40 
 587 nm   30.60   23.40 
 657 nm   29.70   22.30 
Calculated Relative Intensity Colors of Strontiomelane in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360% 380%

Calculated Properties of Strontiomelane

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.27 gm/cc
note: Specific Gravity of Strontiomelane =4.57 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0079889633
Boson Index = 0.9920110367
Help on Photoelectric: Photoelectric: PEStrontiomelane = 27.51 barns/electron
U=PEStrontiomelane x rElectron Density= 117.53 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Strontiomelane is Not Radioactive

Strontiomelane Classification

Help on  Dana Class: Dana Class: (07)Multiple Oxides
  (07.09)Dana Type
  (07.09.01)Cryptomelane Group (Hard black, fine-grained) Hollandite Ba(Mn,Mn)8O16 I2/m 2/m Cryptomelane K(Mn,Mn)8O16 I2/m 2/m Manjiroite (Na,K)(Mn,Mn)8O16•n(H2O) I 4/m 4/m Coronadite Pb(Mn,Mn)8O16 I2/m 2/m Strontiomelane! SrMn6Mn2O16 P 21/m 2/m Henrymeyerite! BaFeTi7O16 I 4/m 4/m
Help on  Strunz Class: Strunz Class: 04.DK.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DK -With large (� medium-sized) cations; tunnel structures
04.DK.10 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m
04.DK.10 Todorokite (Na,Ca,K)2(Mn,Mn)6O12•3-4.5(H2O) P 2/m 2/m
04.DK.10 Romanechite (Ba,H2O)2(Mn,Mn)5O10 C 2/m 2/m
04.DK.10 Strontiomelane! SrMn6Mn2O16 P 21/m 2/m

Other Strontiomelane Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(AmMin, V 85, p628) OPTIC PROP.(AmMin, V 85, p628)
Help on See Also: See Also: Links to other databases for Strontiomelane :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 04.DK.10





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