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Brabantite Mineral Data

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General Brabantite Information

Help on Chemical  Formula: Chemical Formula: CaTh(PO4)2
Help on Composition: Composition: Molecular Weight = 462.06 gm
   Calcium      8.67 %  Ca   12.14 % CaO
   Thorium     50.22 %  Th   57.14 % ThO2
   Phosphorus  13.41 %  P    30.72 % P2O5
   Oxygen      27.70 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaTh(PO4)2
Help on Environment: Environment: In a zoned granite pegmatite. The name brabantite (1980) has been discredited, cheralite having priority as name for members dominated by CaTh(PO4)2.
Help on IMA Status: IMA Status: Discredited IMA 2006
Help on Locality: Locality: In the Van der Made pegmatite, Brabant Farm, west of Itiro, Karibib district, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the Brabant Farm, Namibia, location of the pegmatite where the mineral was first found.
Help on Name Pronunciation: Name Pronunciation: Brabantite + Pronunciation Say BRABANTITE
Help on Synonym: Synonym: Lingaitukuang

Brabantite Image

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Comments: Altering micro grain of brabantite.
Location: Kuttakuzhi, near Trivandrum, Travancore, Kerala, India. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Brabantite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9701:1:0.9299
Help on Cell Dimensions: Cell Dimensions: a = 6.726, b = 6.933, c = 6.447, Z = 2; beta = 103.883° V = 291.85 Den(Calc)= 5.26
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.06(1), 2.85(0.75), 3.26(0.7),

Physical Properties of Brabantite

Help on Cleavage: Cleavage: {100} Good, {001} Good
Help on Color: Color: Gray brown, Reddish brown.
Help on Density: Density: 4.72
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous - Resinous

Optical Properties of Brabantite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.127 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.217 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1388,KPDmeas= 0.1547,KC= 0.1771
Ncalc = 1.84 - 1.93
Help on Optical Data: Optical Data: Biaxial (?), b=1.73

Calculated Properties of Brabantite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.17 gm/cc
note: Specific Gravity of Brabantite =4.72 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002505634
Boson Index = 0.9997494366
Help on Photoelectric: Photoelectric: PEBrabantite =1,198.21 barns/electron
U=PEBrabantite x relectron=4,993.89 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 945,983.71 (Gamma Ray American Petroleum Institute Units)
Concentration of Brabantite per GRapi unit =1,057.10 (PPB)

Brabantite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 32.15 ± 8.04 grams of pure Brabantite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 3215.3 ±803.84 grams of pure Brabantite .

Estimated Radioactivity from Brabantite - strong
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 7.40 cm 22,497,800 6.08E-04 945,983.71 311.01
100 gm / 3.43 cm 2,249,780 6.08E-05 94,598.37 31.10
10 gm / 1.59 cm 224,978 6.08E-06 9,459.84 3.11
1 gm / 7.40 mm 22,498 6.08E-07 945.98 0.31
0.1 gm / 3.43 mm 2,250 6.08E-08 94.60 0.03
0.01 gm / 1.59 mm 225 6.08E-09 9.46 0.00
0.001 gm / 0.74 mm 22 6.08E-10 0.95 0.00

Weight of pure Brabantite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.72 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

Brabantite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.04)A+ XO4
  (38.04.03)Monazite Group (Monoclinic: P21/n) Monazite-(Ce) (Ce,La,Nd,Th)PO4 P 21/n 2/m Monazite-(La) (La,Ce,Nd)PO4 P 21/n 2/m Cheralite-(Ce)? (Ce,Ca,Th)(P,Si)O4 P 21/n 2/m Brabantite? CaTh(PO4)2 P 21 2 Monazite-(Nd) (Nd,Ce,La)(P,Si)O4 P 21/n 2/m Gasparite-(Ce) CeAsO4 P 21/n 2/m Monazite-(Sm)! SmPO4 P 21/n 2/m
Help on  Strunz Class: Strunz Class: 08.AD.50 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AD -With only large cations
08.AD.50 Brabantite? CaTh(PO4)2 P 21 2
08.AD.50 Gasparite-(Ce) CeAsO4 P 21/n 2/m
08.AD.50 Monazite-(Ce) (Ce,La,Nd,Th)PO4 P 21/n 2/m
08.AD.50 Monazite-(La) (La,Ce,Nd)PO4 P 21/n 2/m
08.AD.50 Monazite-(Nd) (Nd,Ce,La)(P,Si)O4 P 21/n 2/m
08.AD.50 Rooseveltite BiAsO4 P 2/m 2/m
08.AD.50 Monazite-(Sm)! SmPO4 P 21/n 2/m

Other Brabantite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Brabantite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

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Dana No: Strunz No: 08.AD.50





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