Takedaite Mineral Data

General Takedaite Information

Chemical Formula:

Ca3(BO3)2

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

Empirical Formula:

Ca₃(BO₃)₂

Environment:

In a vein developed along the boundary between crystalline limestone and gehlenite-spurrite skarn. Ca-analog to kotoite and jotoite.

IMA Status:

Approved IMA 1995

Locality:

Fuka, Bitchu-Cho, Okayama Prefeture, Japan. Link to MinDat.org Location Data.

Name Origin:

For Prof. Hiroshi Takeda (1934- ) , of the Mineralogial Institute, University of Tokyo.

Name Pronunciation:

Takedaite + Pronunciation

Synonym:

IMA1993-049

Takedaite Image

Images:

Takedaite

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

Takedaite Crystallography

Axial Ratios:

a:c = 1:1.37184

Cell Dimensions:

a = 8.638, c = 11.85, Z = 6; V = 765.73 Den(Calc)= 3.09

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/I_o): 2.915(1), 1.895(0.75), 2.756(0.61),

Physical Properties of Takedaite

Cleavage:

{110} Imperfect

Color:

White, Pale gray, Colorless.

Density:

3.1

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Takedaite

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

Optical Data:

Uniaxial (-), e=1.63, w=1.726, bire=0.0960.

Calculated Properties of Takedaite

Electron Density:

Bulk Density (Electron Density)=3.08 gm/cc
note: Specific Gravity of Takedaite =3.10 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Takedaite= 6.32 barns/electron
U=PE_Takedaite x rElectron Density= 19.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Takedaite is Not Radioactive

Takedaite Classification

Dana Class:

24.03.05.01 (24)Borates - Anhydrous

(24.03)where (A)m (B)n [XO3]p

(24.03.05)Dana Group

24.03.05.01 Takedaite Ca3(BO3)2 R 3c 3 2/m

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

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(MinRec)

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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Print or Cut-and-Paste your Takedaite Specimen Label here :

Takedaite

Ca3(BO3)2
Dana No: 24.03.05.01 Strunz No: 06.AA.40
Locality:

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