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Watatsumiite

A valid IMA mineral species
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About WatatsumiiteHide

Formula:
KNa2Li(Mn2+)2V4+2[Si4O12]2
Colour:
Peridot-green, yellow-green
Lustre:
Vitreous
Hardness:
5½ - 6
Specific Gravity:
3.24 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named after Watatsumi (or Wadatsumi), a Japanese sea god, analogous to Neptune in European mythology and Aegir in Scandinavian one, thus the nexus with Neptunite and Aegirine, named after that sea god.
This page provides mineralogical data about Watatsumiite.


Unique IdentifiersHide

Mindat ID:
11461
Long-form identifier:
mindat:1:1:11461:9
GUID
(UUID V4):
cb3ca50c-e100-468a-a4f1-46428019683e

IMA Classification of WatatsumiiteHide

Classification of WatatsumiiteHide

9.EH.05

9 : SILICATES (Germanates)
E : Phyllosilicates
H : Transitional structures between phyllosilicate and other silicate units

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
WtsIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of WatatsumiiteHide

Vitreous
Transparency:
Transparent
Colour:
Peridot-green, yellow-green
Streak:
White with a greenish tint
Hardness:
5½ - 6 on Mohs scale
Hardness:
VHN100=707 - 946 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
on {110} poor
Fracture:
Conchoidal
Density:
3.24 g/cm3 (Calculated)

Optical Data of WatatsumiiteHide

Type:
Biaxial (+)
RI values:
nα = 1.686(2) nβ = 1.694 nγ = 1.720(5)
2V:
Measured: 60° (5)
Max Birefringence:
δ = 0.034
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Visible
Comments:
yellowish to pale yellowish green

Chemistry of WatatsumiiteHide

Mindat Formula:
KNa2Li(Mn2+)2V4+2[Si4O12]2

Crystallography of WatatsumiiteHide

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bb
Setting:
Cc
Cell Parameters:
a = 16.450(16) Å, b = 12.492(7) Å, c = 9.995(8) Å
β = 115.32(6)°
Ratio:
a:b:c = 1.317 : 1 : 0.8
Unit Cell V:
1,856.59 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Rounded prismatic embedded grains. Elongate along [001] and terminated by pyramidal faces.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0013131WatatsumiiteMatsubara S, Miyawaki R, Kurosawa M, Suzuki Y (2003) Watatsumiite, KNa2LiMn2V2Si8O24, a new mineral from the Tanohata mine, Iwate Prefecture, Japan Journal of Mineralogical and Petrological Sciences 98 142-1502003metamorphosed manganese ore deposit, Tanohata mine, Iwate Prefecture, Japan0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.19 Å(100)
2.49 Å(93)
2.94 Å(90)
4.52 Å(85)
9.58 Å(84)
2.90 Å(66)
3.52 Å(63)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits

Type Occurrence of WatatsumiiteHide

General Appearance of Type Material:
Light yellowish green prismatic crystals, less than 1mm long, embedded in massive quartz.
Place of Conservation of Type Material:
National Science Museum, Tokyo, Japan (NSM-M28187).
Geological Setting of Type Material:
Metamorphosed sedimentary manganese ore.
Associated Minerals at Type Locality:
Reference:
Matsubara, S., Miyawaki, R., Kurosawa, M. and Suzuki, Y. (2003) Watatsumiite, KNa2LiMn2V2Si8O24, a new mineral from the Tanohata mine, Iwate Prefecture, Japan. Journal of Mineralogical and Petrological Sciences: 98: 142-150.

Synonyms of WatatsumiiteHide

Other Language Names for WatatsumiiteHide

Simplified Chinese:海神石
Spanish:Watatsumiita
Traditional Chinese:海神石

Relationship of Watatsumiite to other SpeciesHide

Member of:
Other Members of this group:
MagnesioneptuniteKNa2Li(Mg)2Ti2[Si4O12]2Mon. 2/m : B2/b
ManganoneptuniteKNa2Li(Mn2+)2Ti2[Si4O12]2Mon. m : Bb
NeptuniteKNa2Li(Fe2+)2Ti2[Si4O12]2Mon. m : Bb
RotherkopfiteKNa2Fe2+(Fe2+)2(Ti1.5Fe2+0.5)[Si4O12]2Mon. 2/m : B2/b

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Watatsumiite associated with Potassic-ferri-leakeite[K][Na2][Mg2Fe3+2Li]Si8O22(OH)2

Related Minerals - Strunz-mindat GroupingHide

9.EH.05ManganoneptuniteKNa2Li(Mn2+)2Ti2[Si4O12]2Mon. m : Bb
9.EH.05NeptuniteKNa2Li(Fe2+)2Ti2[Si4O12]2Mon. m : Bb
9.EH.05MagnesioneptuniteKNa2Li(Mg)2Ti2[Si4O12]2Mon. 2/m : B2/b
9.EH.05RotherkopfiteKNa2Fe2+(Fe2+)2(Ti1.5Fe2+0.5)[Si4O12]2Mon. 2/m : B2/b
9.EH.10GrumantiteNa(HSi2O5) · H2OOrth. mm2 : Fdd2
9.EH.15SarcoliteNa4Ca12Al8Si12O46(SiO4,PO4)(OH,H2O)4(CO3,Cl)Tet. 4/m : I4/m
9.EH.20UssingiteNa2AlSi3O8OHTric. 1 : P1
9.EH.25Leifite(Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2Trig. 3m : P3m1
9.EH.25Telyushenkoite(Cs,Na,K)Na6[Be2Al3Si15O39]F2Trig. 3m (3 2/m) : P3 1m
9.EH.25EirikiteKNa6Be2(Si15Al3)O39F2Trig. 3m (3 2/m) : P3m1
9.EH.30NafertisiteNa3Fe2+10Ti2(Si6O17)2O2(OH)6F(H2O)2Mon. 2/m
9.EH.35VebleniteKNa(Fe2+5Fe3+4Mn7)Nb4(Si2O7)2(Si8O22)2O6(OH)10(H2O)3 Tric. 1 : P1

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for WatatsumiiteHide

References for WatatsumiiteHide

Localities for WatatsumiiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Japan (TL)
 
  • Iwate Prefecture
    • Shimohei District
      • Tanohata
Matsubara et al. (2003) +1 other reference
 
矿物 and/or 产地  
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