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Strakhovite Mineral Data

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General Strakhovite Information

Help on Chemical  Formula: Chemical Formula: NaBa3(Mn++,Mn+++)4Si6O19(OH)3
Help on Composition: Composition: Molecular Weight = 1,178.25 gm
   Barium     34.97 %  Ba   39.04 % BaO
   Sodium      1.95 %  Na    2.63 % Na2O
   Manganese  18.65 %  Mn   18.06 % MnO /  7.38 % MnO2
   Silicon    14.30 %  Si   30.60 % SiO2
   Hydrogen    0.26 %  H     2.29 % H2O
   Oxygen     29.87 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaBa3Mn2+3Mn4+Si6O19(OH)3
Help on Environment: Environment: At the contact between braunite ore and alkali basalt.
Help on IMA Status: IMA Status: Approved IMA 1994
Help on Locality: Locality: The Ir-Nimi manganese deposit, Taikan Ridge, Far East, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For N. M Strakhov (1900-1978), for his contributions to the study of sedimentary ore deposits and phosphorites.
Help on Name Pronunciation: Name Pronunciation: Strakhovite + Pronunciation Say STRAKHOVITE
Help on Synonym: Synonym: ICSD 39582
  PDF 46-1421

Strakhovite Image

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Comments: Dark green vitreous massive strakhovite with inset image of sample.
Location: Dzhavodi Area, Ir-Nimi manganese deposit, Taikan Ridge, Khabarovskiy Kray, Far-Eastern Region, Russia. Scale: See Image.
© Rruff Database

Strakhovite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.9093:1:0.5854
Help on Cell Dimensions: Cell Dimensions: a = 23.42, b = 12.266, c = 7.181, Z = 4; V = 2,062.88 Den(Calc)= 3.79
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.655(1), 2.999(1), 3.303(0.9),

Physical Properties of Strakhovite

Help on Cleavage: Cleavage: {110} Imperfect
Help on Color: Color: Black, Greenish black, Dark olive green.
Help on Density: Density: 3.86
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: green

Optical Properties of Strakhovite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.099 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.119 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2138,KPDmeas= 0.2099,KC= 0.1911
Ncalc = 1.72 - 1.74
Help on Optical Data: Optical Data: Biaxial (+), a=1.767, b=1.793, g=1.871, bire=0.1040, 2V(Calc)=64, 2V(Meas)=60-65. Dispersion strong, r > v.
Help on Pleochroism (x): Pleochroism (x): light green or light green.
Help on Pleochroism (y): Pleochroism (y): green or green.
Help on Pleochroism (z): Pleochroism (z): dark olive green or brown.

Calculated Properties of Strakhovite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.55 gm/cc
note: Specific Gravity of Strakhovite =3.86 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEStrakhovite = 157.97 barns/electron
U=PEStrakhovite x rElectron Density= 561.00 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Strakhovite is Not Radioactive

Strakhovite Classification

Help on  Dana Class: Dana Class: (64)Cyclosilicates
  (64.03)4-membered rings with [Si2O7] dimers
  (64.03.02)Dana Group Strakhovite NaBa3(Mn,Mn)4Si6O19(OH)3 P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.CF.20 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CF -[Si4O12]8- 4-membered single rings, with insular complex anions
09.CF.20 Strakhovite NaBa3(Mn,Mn)4Si6O19(OH)3 P nma 2/m 2/m 2/m

Other Strakhovite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Strakhovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Dana No: Strunz No: 09.CF.20





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