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Tanohataite

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Formula:
LiMn2(HSi3O9)
System:
Triclinic
Colour:
Pinkish-white
Hardness:
5 - 5½
Name:
Named for the type locality.
Isostructural with:
The Li analogue of sérandite.

Classification of Tanohataite

Approved
Approval Year:
2007
mindat.org URL:
http://www.mindat.org/min-32664.html
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Type Occurrence of Tanohataite

General Appearance of Type Material:
Aggregates of fibrous crystals in veinlets
Geological Setting of Type Material:
metasedimentary
Associated Minerals at Type Locality:

Physical Properties of Tanohataite

Vitreous, Silky
Diaphaneity (Transparency):
Transparent
Colour:
Pinkish-white
Streak:
White
Hardness (Mohs):
5 - 5½
Cleavage:
Perfect
on {001} and {100}.
Density:
3.33 g/cm3 (Calculated)

Crystallography of Tanohataite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.612Å, b = 7.038Å, c = 6.700Å
α = 90.23°, β = 94.70°, γ = 105.26°
Ratio:
a:b:c = 1.082 : 1 : 0.952
Unit Cell Volume:
V 345 ų
Z:
2
Morphology:
In aggregates of fibrous crystals

Optical Data of Tanohataite

Type:
Biaxial (-)
RI values:
nα = 1.593(3) nβ = 1.618(3) nγ = 1.653(3)
2V:
Calculated: 82°
Max Birefringence:
δ = 0.060
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Tanohataite

Formula:
LiMn2(HSi3O9)
All elements listed in formula:
Analytical Data:
From type description: Electron microprobe analysis and laser ablation microprobe-inductively coupled plasma-mass spectrometry
SiO2 (51.97)
MnO (37.99)
MgO (1.06)
CaO (0.41)
Na2O (1.97)
Li2O (3.34)
total 96.74 wt
Empirical Formula:
(Li0.78Na0.221.00(Mn1.86Ca0.03Mg0.091.98Si3.01O 8(OH)

Relationship of Tanohataite to other Species

Other Members of Group:
Barrydawsonite-(Y)Na1.5Y0.5CaSi3O9H
BustamiteCaMn2+(Si2O6)
CascanditeCa(Sc,Fe3+)(HSi3O9)
FerrobustamiteCaFe2+(Si2O6)
MarshallsussmaniteNaCaMnSi3O8(OH)
PectoliteNaCa2Si3O8(OH)
SéranditeNaMn22+Si3O8(OH)
VistepiteSnMn4B2Si4O16(OH)2
WollastoniteCaSiO3

Other Names for Tanohataite

Name in Other Languages:
Japanese:田野畑石

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.

References for Tanohataite

Reference List:
Nagase, Toshiro; Hori, Hidemichi; Kitamine, Mizuya; Nagashima, Mariko; Abduriyim, Ahmadjan; Kuribayashi, Takahiro (2012): Tanohataite, LiMn2Si3O8(OH): a new mineral from the Tanohata mine, Iwate Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 149-154.

Internet Links for Tanohataite

Localities for Tanohataite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (TL)
 
  • Honshu Island
    • Tohoku Region
      • Iwate Prefecture
        • Shimohei-gun
          • Tanohata-mura
            • Tanohata mine
Nagase, Toshiro; Hori, Hidemichi; Kitamine, Mizuya; Nagashima, Mariko; Abduriyim, Ahmadjan; Kuribayashi, Takahiro (2012): Tanohataite, LiMn2Si3O8(OH): a new mineral from the Tanohata mine, Iwate Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 149-154.
Mineral and/or Locality  
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