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Takedaite

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About TakedaiteHide

Formula:
Ca3[BO3]2
Colour:
White to pale grey
Lustre:
Vitreous
Hardness:
Specific Gravity:
3.10
Crystal System:
Trigonal
Name:
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

Approved
Approval Year:
1993
First Published:
1995
6.AA.40

6 : BORATES
A : Monoborates
A : BO3, without additional anions; 1(D).
24.3.5.1

24 : ANHYDROUS BORATES
3 : AmBn[XO3]p

Physical Properties of TakedaiteHide

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

Optical Data of TakedaiteHide

Type:
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:
High

Chemical Properties of TakedaiteHide

Formula:
Ca3[BO3]2
IMA Formula:
Ca3B2O6

Crystallography of TakedaiteHide

Crystal System:
Trigonal
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.
Reference:
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

German:Takedait
Spanish:Takedaita

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.35Jimboite(Mn2+,Mg)3[BO3]2Orth.
6.AA.35KotoiteMg3[BO3]2Orth. mmm (2/m 2/m 2/m) : Pnnm

Other InformationHide

Notes:
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

ⓘ - 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)
 
  • Honshu Island
    • Chugoku Region
      • Okayama Prefecture
        • 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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