Mineralogy Database

Watatsumiite Mineral Data

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General Watatsumiite Information

Help on Chemical  Formula: Chemical Formula: Na2KMn2LiV2Si8O24
Help on Composition: Composition: Molecular Weight = 905.03 gm
   Potassium   4.06 %  K     4.89 % K2O
   Barium      0.76 %  Ba    0.85 % BaO
   Sodium      5.28 %  Na    7.12 % Na2O
   Lithium     0.74 %  Li    1.60 % Li2O
   Magnesium   0.97 %  Mg    1.60 % MgO
   Titanium    1.90 %  Ti    3.18 % TiO2
   Manganese   9.53 %  Mn   12.31 % MnO
   Vanadium    9.34 %  V    16.68 % V2O5
   Iron        0.25 %  Fe    0.32 % FeO
   Silicon    24.73 %  Si   52.91 % SiO2
   Oxygen     42.43 %  O
             ______        ______ 
             100.00 %      101.46 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.94Ba0.05Na2.08Li0.97Mn2+1.57Mg0.36Fe2+0.04V5+1.66Ti0.36Si7.97O24
Help on Environment: Environment: Closely associated with potassicleakeite in the dump material from the No. 3 orebody (metamorphosed Mn ore). (isostructural with neptunite; structure)
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Tanohata mine, Iwate Prefecture, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after watatsumi, Japanese god of the sea as is the analogue (neptunite) neptune, Roman god of the sea.
Help on Synonym: Synonym: IMA2001-043

Watatsumiite Image

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  Watatsumiite   Potassicleakeite

Comments: Yellow green prismatic crystal of watatsumiite terminated by pyramidal faces associated with reddish brown potassicleakeite and clear quartz (JMPS, v 98, p 149).
Location: Tanohata mine, Iwate Prefecture, Japan. Scale: See Image.

Watatsumiite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3168:1:0.8001
Help on Cell Dimensions: Cell Dimensions: a = 16.45, b = 12.492, c = 9.995, Z = 4; beta = 115.32° V = 1,856.59 Den(Calc)= 3.24
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.19(1)(330,132), 2.49(0.93)(441,621), 2.94(0.9)(223), 4.52(0.85)(002), 9.58(0.84)(110), 2.9(0.66)(222,510), 3.52(0.63)(131),

Physical Properties of Watatsumiite

Help on Cleavage: Cleavage: {???} Poor
Help on Color: Color: Yellow green.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: greenish white

Optical Properties of Watatsumiite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.086 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.216,KC= 0.2364
Ncalc = 1.77
Help on Optical Data: Optical Data: Biaxial (+), a=1.686, b=1.694, g=1.72, bire=0.0340

Calculated Properties of Watatsumiite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.16 gm/cc
note: Specific Gravity of Watatsumiite =3.24 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEWatatsumiite = 9.17 barns/electron
U=PEWatatsumiite x relectron= 28.93 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 57.05 (Gamma Ray American Petroleum Institute Units)
Concentration of Watatsumiite per GRapi unit = 1.75 (%)

Estimated Radioactivity from Watatsumiite - barely detectable


Watatsumiite Classification

Help on  Dana Class: Dana Class: (70)Inosilicate Column or Tube Structures
  (70.04)with linked chains forming cages
  (70.04.01)Neptunite group Neptunite KNa2Li(Fe,Mn)2Ti2Si8O24 Cc m Manganoneptunite KNa2Li(Mn,Fe)2Ti2Si8O24 C 2/m 2/m Watatsumiite! Na2KMn2LiV2Si8O24 Cc m IMA2009-009 KNa2Li(Mg,Fe)2Ti2Si8O24 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.EH.05 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EH -Transitional structures between phyllosilicate and other silicate units
09.EH.05 Neptunite KNa2Li(Fe,Mn)2Ti2Si8O24 Cc m
09.EH.05 Manganoneptunite KNa2Li(Mn,Fe)2Ti2Si8O24 C 2/m 2/m
09.EH.05 Watatsumiite! Na2KMn2LiV2Si8O24 Cc m

Other Watatsumiite Information

Help on References: References: NAME( AmMin, v 89, p 896) PHYS. PROP.(AmMin, v 89, p 896) OPTIC PROP.(AmMin, v 89, p 896)
Help on See Also: See Also: Links to other databases for Watatsumiite :
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: Strunz No: 09.EH.05





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