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Takedaite

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Fuka mine, Bitchu-cho (Bicchu-cho), Takahashi, Okayama Prefecture, Chugoku Region, Honshu Island, Japan
© 2008, J. Weissman

Formula:
Ca
 
3
[BO
 
3
]
 
2
System:TrigonalColour:White to pale grey
Lustre:VitreousHardness:4½
Name:Named for Professor Hiroshi Takeda (b. 1934) of the Mineralogical Institute, University of Tokyo, Japan
This page provides mineralogical data about Takedaite.

Classification of Takedaite

IMA status:Approved 1993
Strunz 8th edition ID:5/G.01-30
Nickel-Strunz 10th (pending) edition ID:6.AA.40

6 : BORATES
A : Monoborates
A : BO3, without additional anions; 1(D).
Dana 8th edition ID:24.3.5.1

24 : ANHYDROUS BORATES
3 : AmBn[XO3]p
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Type Occurrence of Takedaite

Type Locality:Fuka mine, Bitchu-cho (Bicchu-cho), Takahashi, Okayama Prefecture, Chugoku Region, Honshu Island, Japan
Year of Discovery:1995

Physical Properties of Takedaite

Lustre:Vitreous
Colour:White to pale grey
Streak:White
Hardness (Mohs):4½

Crystallography of Takedaite

Crystal System:Trigonal
Cell Parameters:c = 11.85Å
Unit Cell Volume:V 0.00 ų (Calculated from Unit Cell)

Optical Data of Takedaite

Type:Uniaxial (-)
RI values: nω = 1.726 nε = 1.630
Maximum Birefringence:δ = 0.096

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Takedaite

Formula:
Ca
 
3
[BO
 
3
]
 
2
Essential elements:B, Ca, O
All elements listed in formula:B, Ca, O

Relationship of Takedaite to other Species

Related Minerals - Nickel-Strunz Grouping):
6.AA.05Sassolite
H
 
3
BO
 
3
6.AA.15Nordenskiöldine
CaSn
4+
 
[BO
 
3
]
 
2
6.AA.15Tusionite
Mn
2+
 
Sn
4+
 
[BO
 
3
]
 
2
6.AA.35Jimboite
(Mn
2+
 
,Mg)
 
3
[BO
 
3
]
 
2
6.AA.35Kotoite
Mg
 
3
[BO
 
3
]
 
2
6.AA.45Santarosaite
CuB
 
2
O
 
4

Other Names for Takedaite

Synonyms:
IMA1993-049
German names:
Takedait
Russian names:
Такедаит
Spanish names:
Takedaita

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 Takedaite

Reference List:Mineralogical Magazine (1995): 59: 549-552.

Mineralogical Record: 27: 306.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Takedaite

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  • Raman and XRD data at RRUFF project
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  • Takedaite details from Handbook of Mineralogy (PDF)
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    Localities for Takedaite

    (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
      • Chugoku Region
        • Okayama Prefecture
          • Takahashi
            • Bitchu-cho (Bicchu-cho)
    		Mineralogical Magazine (1995): 59: 549-552; Mineralogical Record: 27: 306.
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