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Watatsumiite Mineral Data
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General Watatsumiite Information
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 Chemical Formula: |
Na2KMn2LiV2Si8O24 |
| Composition: |
Molecular Weight = 905.03 gm |
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Potassium 4.06 % K 4.89 % K2O |
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Barium 0.76 % Ba 0.85 % BaO |
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Sodium 5.28 % Na 7.12 % Na2O |
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Lithium 0.74 % Li 1.60 % Li2O |
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Magnesium 0.97 % Mg 1.60 % MgO |
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Titanium 1.90 % Ti 3.18 % TiO2 |
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Manganese 9.53 % Mn 12.31 % MnO |
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Vanadium 9.34 % V 16.68 % V2O5 |
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Iron 0.25 % Fe 0.32 % FeO |
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Silicon 24.73 % Si 52.91 % SiO2 |
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Oxygen 42.43 % O |
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______ ______ |
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100.00 % 101.46 % = TOTAL OXIDE |
| Empirical Formula: |
K0.94Ba0.05Na2.08Li0.97Mn2+1.57Mg0.36Fe2+0.04V5+1.66Ti0.36Si7.97O24 |
| Environment: |
Closely associated with potassicleakeite in the dump material from the No. 3 orebody (metamorphosed Mn ore). (isostructural with neptunite; structure) |
| IMA Status: |
Approved IMA 2003 (Dana # Added) |
| Locality: |
Tanohata mine, Iwate Prefecture, Japan. Link to MinDat.org Location Data. |
| Name Origin: |
Named after watatsumi, Japanese god of the sea as is the analogue (neptunite) neptune, Roman god of the sea. |
| Synonym: |
IMA2001-043 |
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Watatsumiite Image |
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Images:
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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.
© JMPS |
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Watatsumiite Crystallography
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| Axial Ratios: |
a:b:c =1.3168:1:0.8001 |
| Cell Dimensions: |
a = 16.45, b = 12.492, c = 9.995, Z = 4; beta = 115.32° V = 1,856.59 Den(Calc)= 3.24 |
| Crystal System: |
Monoclinic - Domatic H-M Symbol (m) Space Group: Cc |
| 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), |
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Physical Properties of Watatsumiite
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| Cleavage: |
{???} Poor |
| Color: |
Yellow green. |
| Diaphaneity: |
Translucent |
| Fracture: |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
| Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Hardness: |
5.5-6 - Knife Blade-Orthoclase |
| Luster: |
Vitreous (Glassy) |
| Streak: |
greenish white |
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Optical Properties of Watatsumiite
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| Gladstone-Dale: |
CI calc= 0.086 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.216,KC= 0.2364
Ncalc = 1.77 |
| Optical Data: |
Biaxial (+), a=1.686, b=1.694, g=1.72, bire=0.0340 |
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Calculated Properties of Watatsumiite
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| Electron Density: |
Bulk Density (Electron Density)=3.16 gm/cc
note: Specific Gravity of Watatsumiite =3.24 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEWatatsumiite = 9.17 barns/electron
U=PEWatatsumiite x relectron= 28.93 barns/cc.
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| Radioactivity: |
GRapi = 57.05 (Gamma Ray American Petroleum Institute Units)
Concentration of Watatsumiite per GRapi unit = 1.75 (%)
Estimated Radioactivity from Watatsumiite  - barely detectable
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Watatsumiite Classification
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| Dana Class: |
70.04.01.03 (70)Inosilicate Column or Tube Structures |
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(70.04)with linked chains forming cages |
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(70.04.01)Neptunite group |
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70.04.01.01 Neptunite KNa2Li(Fe,Mn)2Ti2Si8O24 Cc m |
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70.04.01.02 Manganoneptunite KNa2Li(Mn,Fe)2Ti2Si8O24 C 2/m 2/m |
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70.04.01.03 Watatsumiite! Na2KMn2LiV2Si8O24 Cc m |
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70.04.01.04 IMA2009-009 KNa2Li(Mg,Fe)2Ti2Si8O24 C 2/m 2/m |
| Strunz Class: |
09.EH.05 09 - SILICATES (Germanates) |
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09.E - Phyllosilicates |
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09.EH -Transitional structures between phyllosilicate and other silicate units |
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09.EH.05 Neptunite KNa2Li(Fe,Mn)2Ti2Si8O24 Cc m |
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09.EH.05 Manganoneptunite KNa2Li(Mn,Fe)2Ti2Si8O24 C 2/m 2/m |
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09.EH.05 Watatsumiite! Na2KMn2LiV2Si8O24 Cc m |
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Other Watatsumiite Information
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| References: |
NAME( AmMin, v 89, p 896) PHYS. PROP.(AmMin, v 89, p 896) OPTIC PROP.(AmMin, v 89, p 896) |
| 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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Print or Cut-and-Paste your Watatsumiite Specimen Label here :
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Watatsumiite
Na2KMn2LiV2Si8O24
Dana No: 70.04.01.03 Strunz No: 09.EH.05
Locality:
Notes:
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