Takedaite Mineral Data

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.

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 ScalenohedralH-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),

Crystal Structure:

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Vegas A , Cano F H , Garcia-Blanco S , Acta Crystallographica, Section B , 31 (1975) p.1416-1419, The crystal structure of calcium orthoborate: a redetermination

View Additional jPOWD Structure files for Takedaite
[1]

Physical Properties of Takedaite

Cleavage:

[110] Imperfect

Color:

White, Pale gray, Colorless.

Density:

3.1

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Takedaite

Electron Density:

r_electron=3.08 gm/cc
note: r_Takedaite=3.10 gm/cc.

Fermion Index

Fermion Index = 0.01896
Boson Index = 0.98104

Photoelectric:

PE_Takedaite= 6.32 barns/electron
U=PE_Takedaite x r_electron= 19.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Takedaite is Not Radioactive

Takedaite Classification

Dana Class:

24.3.5.1 (24)Borates - Anhydrous

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

(24.3.5)Dana Group

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

Strunz Class:

V/G.01-30 V - Nitrates, Carbonates and Borates

V/G - "Insel" borates [BO3]3- "inseln"

V/G.01 - Kotoite - Jimboite series

V/G.01-10 Kotoite Mg3B2O6 Pnmn 2/m 2/m 2/m

V/G.01-20 Jimboite Mn3B2O6 Pnmn,Pmmn 2/m 2/m 2/m

V/G.01-25 Jacquesdietrichite! Cu2[BO(OH)2](OH)3 P nma 2/m 2/m 2/m

V/G.01-30 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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

Takedaite

Ca3(BO3)2
Dana No: 24.3.5.1 Strunz No: V/G.01-30
Locality:

Notes: