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Watatsumiite

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Tanohata Mine, Iwate Prefecture, Tohoku Region, Honshu Island, Japan
© R.Kristiansen

Show Watatsumiite Photos (2)
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, thus the nexus with Neptunite, 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, 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)
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
]
All elements listed in formula:Fe, K, Li, Mn, Na, O, Si, V

Relationship of Watatsumiite to other Species

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.10Grumantite
Na[Si
 
2
O
 
4
(OH)]·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/

Articles/Blogs about Watatsumiite

Internet Links for Watatsumiite

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    Localities for Watatsumiite

    (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
    		Matsubara, S., et al. (2003) Journal of Mineralogical and Petrological Sciences, 98, 142-150.
    Mineral and/or Locality
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