Watatsumiite Mineral Data

Watatsumiite Mineral Data

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General Watatsumiite Information

Chemical Formula:

Na2KMn2LiV2Si8O24

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

Empirical Formula:

K_0.94Ba_0.05Na_2.08Li_0.97Mn²⁺_1.57Mg_0.36Fe²⁺_0.04V⁵⁺_1.66Ti_0.36Si_7.97O₂₄

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

Watatsumiite Image

Images:

Click Here for Larger Watatsumiite Image

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

Watatsumiite Crystallography

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 - DomaticH-M Symbol (m) Space Group: Cc

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Cleavage:

[???] Poor

Color:

Yellow green.

Diaphaniety:

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

Optical Properties of Watatsumiite

Gladstone-Dale:

CI calc= 0.086 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.216,KC= 0.2364

Optical Data:

Biaxial (+), a=1.686, b=1.694, g=1.72, bire=0.0340

Calculated Properties of Watatsumiite

Electron Density:

r_electron=3.16 gm/cc
note: r_Watatsumiite=3.24 gm/cc.

Fermion Index

Fermion Index = 0.01738
Boson Index = 0.98262

Photoelectric:

PE_Watatsumiite= 9.17 barns/electron
U=PE_Watatsumiite x r_electron= 28.93 barns/cc.

Radioactivity:

GRapi = 57.05 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Watatsumiite - barely detectable

Watatsumiite Classification

Dana Class:

70.4.1.3 (70)Inosilicate Column or Tube Structures

(70.4)with linked chains forming cages

(70.4.1)Neptunite group

70.4.1.1 Neptunite KNa2Li(Fe,Mn)2Ti2Si8O24 Cc m

70.4.1.2 Mangan-neptunite KNa2Li(Mn,Fe)2Ti2Si8O24 C 2/m 2/m

70.4.1.3 Watatsumiite ! Na2KMn2LiV2Si8O24 Cc m

Strunz Class:

VIII/F.37-30 VIII - Silicates

VIII/F - Inosilicates (chain and band) complex chain structure. Cylindric chains and others

VIII/F.37 - Neptunite series

VIII/F.37-10 Neptunite KNa2Li(Fe,Mn)2Ti2Si8O24 Cc m

VIII/F.37-20 Mangan-neptunite KNa2Li(Mn,Fe)2Ti2Si8O24 C 2/m 2/m

VIII/F.37-30 Watatsumiite Na2KMn2LiV2Si8O24 Cc m

Other Watatsumiite Information

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Watatsumiite

Na2KMn2LiV2Si8O24
Dana No: 70.4.1.3 Strunz No: VIII/F.37-30
Locality:

Notes: