Braitschite-(Ce) Mineral Data

Braitschite-(Ce) Mineral Data +

General Braitschite-(Ce) Information

Chemical Formula:

(Ca,Na2)7(Ce,La)2B22O43·7(H2O)

Composition:

Molecular Weight = 1,623.88 gm

Sodium 5.66 % Na 7.63 % Na₂O

Calcium 12.34 % Ca 17.27 % CaO

Lanthanum 4.28 % La 5.02 % La₂O₃

Cerium 12.94 % Ce 15.16 % Ce₂O₃

Boron 14.65 % B 47.16 % B₂O₃

Hydrogen 0.87 % H 7.77 % H₂O

Oxygen 49.26 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅Na₄Ce_1.5La_0.5B₂₂O₄₃·7(H₂O)

Environment:

Marine evaporite deposits.

IMA Status:

Approved IMA 1968

Locality:

Cane Creek potash mine, near Moab, Grand County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Otto Braitsch (1921-1966), German mineralogist.

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Braitschite-(Ce) Crystallography

Axial Ratios:

a:c = 1:0.60686

Cell Dimensions:

a = 12.156, c = 7.377, Z = 1; V = 944.04 Den(Calc)= 2.86

Crystal System:

HexagonalSpace Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.283(1), 3.021(0.92), 10.52(0.54),

Physical Properties of Braitschite-(Ce)

Color:

Colorless, White, Pink.

Density:

2.903

Diaphaniety:

Transparent

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Braitschite-(Ce)

Gladstone-Dale:

CI meas= -0.072 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.088 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.226,KPDmeas= 0.2227,KC= 0.2078

Optical Data:

Uniaxial (+), w=1.646, e=1.647, bire=0.0010.

Calculated Properties of Braitschite-(Ce)

Electron Density:

r_electron=2.80 gm/cc
note: r_{Braitschite-(Ce)}=2.90 gm/cc.

Fermion Index

Fermion Index = 0.02958
Boson Index = 0.97042

Photoelectric:

PE_{Braitschite-(Ce)}= 82.82 barns/electron
U=PE_{Braitschite-(Ce)} x r_electron= 232.00 barns/cc.

Radioactivity:

GRapi = 17,724.25 (Gamma Ray American Petroleum Institute Units)

Braitschite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Braitschite-(Ce)** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 8.70 cm	385,719	1.04E-05	17,724.25	5.83
100 gm / 4.04 cm	38,572	1.04E-06	1,772.43	0.58
10 gm / 1.87 cm	3,857	1.04E-07	177.24	0.06
1 gm / 8.70 mm	386	1.04E-08	17.72	0.01
0.1 gm / 4.04 mm	39	1.04E-09	1.77	0.00
0.01 gm / 1.87 mm	4	1.04E-10	0.18	0.00
0.001 gm / 0.87 mm	0	1.04E-11	0.02	0.00

Weight of pure Braitschite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.90 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.86 % Th) From Sum REE Elements (17.22 % REE)

Braitschite-(Ce) Classification

Dana Class:

26.7.6.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.7)Dana Type

(26.7.6)Dana Group

26.7.6.1 Braitschite-(Ce) (Ca,Na2)7(Ce,La)2B22O43·7(H2O) Unk Hex

Strunz Class:

V/K.10-10 V - Nitrates, Carbonates and Borates

V/K - Layered borates with complex groups [Bx(O,OH)y]

V/K.10 - Braitschite-(Ce) series

V/K.10-10 Braitschite-(Ce) (Ca,Na2)7(Ce,La)2B22O43·7(H2O) Unk Hex

Other Braitschite-(Ce) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Braitschite-(Ce) :
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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Braitschite-(Ce)

(Ca,Na2)7(Ce,La)2B22O43·7(H2O)
Dana No: 26.7.6.1 Strunz No: V/K.10-10
Locality:

Notes: