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About WatatsumiiteHide

peridot-green, yellow-green
5½ - 6
Crystal System:
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.

Classification of WatatsumiiteHide

Approval Year:

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

Physical Properties of WatatsumiiteHide

peridot-green, yellow-green
5½ - 6 on Mohs scale
on {110}

Chemical Properties of WatatsumiiteHide

IMA Formula:

Crystallography of WatatsumiiteHide

Crystal System:
Cell Parameters:
a = 16.45 Å, b = 12.492 Å, c = 9.995 Å
β = 115.32°
a:b:c = 1.317 : 1 : 0.8
Unit Cell V:
1,856.59 ų (Calculated from Unit Cell)
rounded prismatic embedded grains

X-Ray Powder DiffractionHide

Powder Diffraction Data:
9.58 (85)
4.52 (85)
3.19 (100)
2.94 (90)
2.49 (95)
(only the 5 strongest lines)

Type Occurrence of WatatsumiiteHide

General Appearance of Type Material:
Light yellowish green prismatic crystals, less than 1mm long, embedded in massive quartz.
Geological Setting of Type Material:
Metamorphosed sedimentary manganese ore.
Associated Minerals at Type Locality:

Synonyms of WatatsumiiteHide

Other Language Names for WatatsumiiteHide

Simplified Chinese:海神石
Traditional Chinese:海神石

Relationship of Watatsumiite to other SpeciesHide

Structurally related to group(s):

Common AssociatesHide

Associated Minerals Based on Photo Data:
Potassic-ferri-leakeite1 photo of Watatsumiite associated with Potassic-ferri-leakeite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.EH.05NeptuniteNa2KLiFe2+2Ti2Si8O24Mon. m : Bb
9.EH.05MagnesioneptuniteKNa2Li(Mg,Fe)2Ti2Si8O24Mon. 2/m : B2/b
9.EH.10GrumantiteNa(HSi2O5) · H2OOrth. mm2 : Fdd2
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[F2|Be2Al3Si15O39]Trig. 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

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.

References for WatatsumiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.

Internet Links 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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Japan (TL)
  • Iwate
    • Shimohei-gun
      • Tanohata-mura
Matsubara, S., et al. (2003) Journal of Mineralogical and Petrological Sciences, 98, 142-150.
Mineral and/or Locality  
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