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Watatsumiite

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Big Photo

Tanohata mine, Shimohei-gun, Iwate Prefecture, Tohoku Region, Honshu Island, Japan
© R.Kristiansen

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Formula:
Na
 
2
KLi(Mn
2+
 
,Fe
2+
 
)
 
2
V
4+
2
[Si
 
8
O
 
24
]
System:MonoclinicColour:peridot-green, ...
Hardness:5½ - 6
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.


Neptunite Group.

Classification of Watatsumiite

IMA status:Approved 2001
Strunz 8th edition ID:8/F.37-30
Nickel-Strunz 10th (pending) edition ID:9.EH.05

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

Type Locality:Tanohata mine, Shimohei-gun, Iwate Prefecture, Tohoku Region, Honshu Island, Japan
General Appearance of Type Material:Light yellowish green prismatic crystals, less than 1mm long, embedded in massive quartz.
Year of Discovery:2000
Geological Setting of type material:Metamorphosed sedimentary manganese ore.
Associated Minerals at type locality:
SuzukiiteQuartzPotassicleakeite

Physical Properties of Watatsumiite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:peridot-green, yellow-green
Hardness (Mohs):5½ - 6
Tenacity:Brittle
Cleavage:Poor/Indistinct
on {110}

Crystallography of Watatsumiite

Crystal System:Monoclinic
Cell Parameters:a = 16.45Å, b = 12.492Å, c = 9.995Å
β = 115.32°
Ratio:a:b:c = 1.317 : 1 : 0.8
Unit Cell Volume:V 1,856.59 ų (Calculated from Unit Cell)
Morphology:rounded prismatic embedded grains
X-Ray Powder Diffraction:
d-spacingIntensity
9.58 (85)
4.52 (85)
3.19 (100)
2.94 (90)
2.49 (95)
Comments:(only the 5 strongest lines)

Chemical Properties of Watatsumiite

Formula:
Na
 
2
KLi(Mn
2+
 
,Fe
2+
 
)
 
2
V
4+
2
[Si
 
8
O
 
24
]
Essential elements:K, Li, Mn, Na, O, Si, V
All elements listed in formula:Fe, K, Li, Mn, Na, O, Si, V

Relationship of Watatsumiite to other Species

Structurally related to group(s):
Neptunite Group
Related Minerals - Nickel-Strunz Grouping):

- +
9.EH.05Manganoneptunite
Na
 
2
KLi(Mn
2+
 
,Fe
2+
 
)
 
2
Ti
 
2
[Si
 
8
O
 
24
]
9.EH.05Neptunite
Na
 
2
KLi(Fe
2+
 
,Mn
2+
 
)
 
2
Ti
 
2
(Si
 
8
O
 
24
)
9.EH.05Magnesioneptunite
KNa
 
2
Li(Mg,Fe)
 
2
Ti
 
2
Si
 
8
O
 
24
9.EH.10Grumantite
Na(HSi
 
2
O
 
5
) · H
 
2
O
9.EH.15Sarcolite
Na
 
2
Ca
 
12
(Ca,K,Fe,Sr,Mg)
 
2
Al
 
8
Si
 
12
(P,Si)O
 
52
F
 
2
9.EH.20Ussingite
Na
 
2
AlSi
 
3
O
 
8
OH
9.EH.25Leifite
(Na,H
 
2
O)Na
 
6
[F
 
2
|Be
 
2
Al
 
2
(Al,Si)Si
 
15
O
 
39
]
9.EH.25Telyushenkoite
(Cs,Na,K)Na
 
6
[F
 
2
|Be
 
2
Al
 
3
Si
 
15
O
 
39
]
9.EH.25Eirikite
KNa
 
6
Be
 
2
(Si
 
15
Al
 
3
)O
 
39
F
 
2
9.EH.30Nafertisite
Na
 
3
(Fe
2+
 
,Fe
3+
 
)
 
6
(Ti
 
2
Si
 
12
O
 
34
)(O,OH)
 
7
 · 2H
 
2
O

Other Names for Watatsumiite

Synonyms:
IMA2001-043
Other Languages:
German:Watatsumiit
Japanese:わたつみ石
Russian:Ватацумит
Spanish:Watatsumiita

Other Information

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

References for Watatsumiite

Reference List:

- +
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.

www2.ocn.ne.jp/~miyajima/

Internet Links for Watatsumiite

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    • Localities for Watatsumiite

    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Iwate Prefecture
          • Shimohei-gun
    		Matsubara, S., et al. (2003) Journal of Mineralogical and Petrological Sciences, 98, 142-150.
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