Watatsumiite
A valid IMA mineral species
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About Watatsumiite
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 Identifiers
Mindat ID:
11461
Long-form identifier:
mindat:1:1:11461:9
GUID
(UUID V4):
(UUID V4):
cb3ca50c-e100-468a-a4f1-46428019683e
IMA Classification of Watatsumiite
Approved
IMA Formula:
LiNa2KMn2V2Si8O24
Approval year:
2001
First published:
2003
Classification of Watatsumiite
9.EH.05
9 : SILICATES (Germanates)
E : Phyllosilicates
H : Transitional structures between phyllosilicate and other silicate units
9 : SILICATES (Germanates)
E : Phyllosilicates
H : Transitional structures between phyllosilicate and other silicate units
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Wts | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Watatsumiite
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
on {110} poor
Fracture:
Conchoidal
Density:
3.24 g/cm3 (Calculated)
Optical Data of Watatsumiite
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.
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Visible
Comments:
yellowish to pale yellowish green
Chemistry of Watatsumiite
Mindat Formula:
KNa2Li(Mn2+)2V4+2[Si4O12]2
Crystallography of Watatsumiite
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)°
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 Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0013131 | Watatsumiite | Matsubara 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 98 142-150 | 2003 | metamorphosed manganese ore deposit, Tanohata mine, Iwate Prefecture, Japan | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Watatsumiite
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 Watatsumiite
Other Language Names for Watatsumiite
German:Watatsumiit
Japanese:わたつみ石
Russian:Ватацумит
Simplified Chinese:海神石
Spanish:Watatsumiita
Traditional Chinese:海神石
Relationship of Watatsumiite to other Species
Member of:
Other Members of this group:
Magnesioneptunite | KNa2Li(Mg)2Ti2[Si4O12]2 | Mon. 2/m : B2/b |
Manganoneptunite | KNa2Li(Mn2+)2Ti2[Si4O12]2 | Mon. m : Bb |
Neptunite | KNa2Li(Fe2+)2Ti2[Si4O12]2 | Mon. m : Bb |
Rotherkopfite | KNa2Fe2+(Fe2+)2(Ti1.5Fe2+0.5)[Si4O12]2 | Mon. 2/m : B2/b |
Common Associates
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 Grouping
9.EH.05 | Manganoneptunite | KNa2Li(Mn2+)2Ti2[Si4O12]2 |
9.EH.05 | Neptunite | KNa2Li(Fe2+)2Ti2[Si4O12]2 |
9.EH.05 | Magnesioneptunite | KNa2Li(Mg)2Ti2[Si4O12]2 |
9.EH.05 | Rotherkopfite | KNa2Fe2+(Fe2+)2(Ti1.5Fe2+0.5)[Si4O12]2 |
9.EH.10 | Grumantite | Na(HSi2O5) · H2O |
9.EH.15 | Sarcolite | Na4Ca12Al8Si12O46(SiO4,PO4)(OH,H2O)4(CO3,Cl) |
9.EH.20 | Ussingite | Na2AlSi3O8OH |
9.EH.25 | Leifite | (Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2 |
9.EH.25 | Telyushenkoite | (Cs,Na,K)Na6[Be2Al3Si15O39]F2 |
9.EH.25 | Eirikite | KNa6Be2(Si15Al3)O39F2 |
9.EH.30 | Nafertisite | Na3Fe2+10Ti2(Si6O17)2O2(OH)6F(H2O)2 |
9.EH.35 | Veblenite | KNa(Fe2+5Fe3+4Mn7)Nb4(Si2O7)2(Si8O22)2O6(OH)10(H2O)3 |
Other Information
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 Watatsumiite
mindat.org URL:
https://www.mindat.org/min-11461.html
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References for Watatsumiite
Reference List:
Matsubara, Satoshi, Miyawaki, Ritsuro, Kurosawa, Masanori, Suzuki, Yasumitsu (2003) Watatsumiite, KNa2LiMn2V2Si8O24, a new mineral from the Tanohata mine, Iwate Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 98 (4) 142-150 doi:10.2465/jmps.98.142
Localities for Watatsumiite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Japan (TL) | |
| Matsubara et al. (2003) +1 other reference |
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Tanohata mine, Tanohata, Shimohei District, Iwate Prefecture, Japan