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About TakedaiteHide

White to pale grey
Specific Gravity:
Crystal System:
Named in honor of Hiroshi Takeda (武田 弘) (b. 12 September 1934), professor at the Mineralogical Institute, University of Tokyo, Japan, for his contributions to mineralogy. The asteroid (4965) Takeda is also named after him.
This page provides mineralogical data about Takedaite.

Classification of TakedaiteHide

Approval Year:
First Published:

A : Monoborates
A : BO3, without additional anions; 1(D).

3 : AmBn[XO3]p

Physical Properties of TakedaiteHide

White to pale grey
4½ on Mohs scale
VHN25=429 - 503 kg/mm2 - Vickers
3.10(2) g/cm3 (Measured)    3.11 g/cm3 (Calculated)

Optical Data of TakedaiteHide

Uniaxial (-)
RI values:
nω = 1.726 nε = 1.630
Max Birefringence:
δ = 0.096
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of TakedaiteHide

IMA Formula:

Crystallography of TakedaiteHide

Crystal System:
Cell Parameters:
c = 11.85 Å

Type Occurrence of TakedaiteHide

General Appearance of Type Material:
Aggregates of granular crystals up to 0.8 mm long.
Place of Conservation of Type Material:
National Science Museum, Tokyo, Japan.
Geological Setting of Type Material:
A vein of borate minerals along a boundary between crystalline limestone and skarn.
Kusachi, I., Henmi, C., Kobayashi, S. (1995) Takedaite, a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine: 59: 549-552.

Synonyms of TakedaiteHide

Other Language Names for TakedaiteHide


Related Minerals - Nickel-Strunz GroupingHide

6.AA.05SassoliteH3BO3Tric. 1 : P1
6.AA.15NordenskiöldineCaSn4+[BO3]2Trig. 3 : R3
6.AA.15TusioniteMn2+Sn4+[BO3]2Trig. 3 : R3
6.AA.35KotoiteMg3[BO3]2Orth. mmm (2/m 2/m 2/m) : Pnnm

Other InformationHide

Easily soluble in dilute hydrochloric acid.
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 TakedaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schuckmann, W. (1969) Zur kristallstruktur des calcium-borates Ca3(BO3)2. Neues Jahrbuch für Mineralogie, Monatshefte: 1969: 142-143.
Vegas, A., Cano, F.H., García-Blanco, S. (1975) The crystal structure of calcium orthoborate: a redetermination. Acta Crystallographica: B31: 1416-1419.
Kusachi, I., Henmi, C., Kobayashi, S. (1995) Takedaite, a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine: 59: 549-552.
Jambor, J.L., Pertsev, N.N., Roberts, A.C. (1996) New mineral names. American Mineralogist: 81: 516-520.
Mandarino, Joseph A. (1996) Abstracts of New Mineral Descriptions. Mineralogical Record: 27(4): 306.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for TakedaiteHide

Localities for TakedaiteHide

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)
  • Okayama
    • Takahashi City
      • Bicchu-cho (Bitchu-cho)
        • Fuka
Mineralogical Magazine (1995): 59: 549-552; Mineralogical Record: 27: 306.; I. Kusachi, Y. Takechi, C. Henmi and S. Kobayashi (1998) Parasibirskite, a New Mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine 62:521-525.
Mineral and/or Locality  
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