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Takedaite Mineral Data

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General Takedaite Information

Help on Chemical  Formula: Chemical Formula: Ca3(BO3)2
Help on Composition: Composition: Molecular Weight = 237.85 gm
   Calcium  50.55 %  Ca   70.73 % CaO
   Boron     9.09 %  B    29.27 % B2O3
   Oxygen   40.36 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3(BO3)2
Help on Environment: Environment: In a vein developed along the boundary between crystalline limestone and gehlenite-spurrite skarn. Ca-analog to kotoite and jotoite.
Help on IMA Status: IMA Status: Approved IMA 1995
Help on Locality: Locality: Fuka, Bitchu-Cho, Okayama Prefeture, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Prof. Hiroshi Takeda (1934- ) , of the Mineralogial Institute, University of Tokyo.
Help on Name Pronunciation: Name Pronunciation: Takedaite + Pronunciation Say TAKEDAITE
Help on Synonym: Synonym: IMA1993-049

Takedaite Image

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Comments: Translucent granular takedaite.
Location: Fuka, Okayama, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Takedaite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.37184
Help on Cell Dimensions: Cell Dimensions: a = 8.638, c = 11.85, Z = 6; V = 765.73 Den(Calc)= 3.09
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.915(1), 1.895(0.75), 2.756(0.61),

Physical Properties of Takedaite

Help on Cleavage: Cleavage: {110} Imperfect
Help on Color: Color: White, Pale gray, Colorless.
Help on Density: Density: 3.1
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Takedaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2194,KPDmeas= 0.2187,KC= 0.2115
Ncalc = 1.65 - 1.66
Help on Optical Data: Optical Data: Uniaxial (-), e=1.63, w=1.726, bire=0.0960.

Calculated Properties of Takedaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.08 gm/cc
note: Specific Gravity of Takedaite =3.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PETakedaite = 6.32 barns/electron
U=PETakedaite x rElectron Density= 19.45 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Takedaite is Not Radioactive

Takedaite Classification

Help on  Dana Class: Dana Class: (24)Borates - Anhydrous
  (24.03)where (A)m (B)n [XO3]p
  (24.03.05)Dana Group Takedaite Ca3(BO3)2 R 3c 3 2/m
Help on  Strunz Class: Strunz Class: 06.AA.40 06 - BORATES
  06.A - Monoborates
  06.AA -BO3, without additional anions; 1(D)
06.AA.40 Takedaite Ca3(BO3)2 R 3c 3 2/m

Other Takedaite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Takedaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 06.AA.40





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