Lucasite-(Ce) Mineral Data

Lucasite-(Ce) Mineral Data
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General Lucasite-(Ce) Information

Help on Chemical Formula: Chemical Formula: CeTi2(O,OH)6
Help on Composition: Composition: Molecular Weight = 332.88 gm
   Cerium    42.09 %  Ce   49.30 % Ce2O3
   Titanium  28.77 %  Ti   47.99 % TiO2
   Hydrogen   0.30 %  H     2.71 % H2O
   Oxygen    28.84 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CeTi2O5(OH)
Help on Environment: Environment: In heavy-media concentrates form non-sandy tuff in an olivine lamproite diatreme.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Argyle AK1 diamondiferous diatreme mine, east Kimberley area, Western Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Hans Lucas, CRA Exploration Pty., Ltd,. Who noted the mineral in concentrates.
Help on Name Pronunciation: Name Pronunciation: Lucasite-(Ce) Say LUCASITE-(CE)
Help on Synonym: Synonym: ICSD 202362
  PDF 40-1455
 

Lucasite-(Ce) Image

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Lucasite-(Ce)

Comments: B&W image of a striated, euhedral lucasite-(Ce) crystal showing {001} and {101} faces. The dark substrate is calcite. (AmMin, v72:1006).
Location: Heavy-mineral concentrate derived from an olivine lamproite tuff at Argyle, in the east Kimberley region of Western Australia. Scale: See Image.
© American Mineralogist

Lucasite-(Ce) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.5913:1:1.1155
Help on Cell Dimensions: Cell Dimensions: a = 5.178, b = 8.756, c = 9.768, Z = 4; beta = 93.52° V = 442.03 Den(Calc)= 5.00
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.376(1), 3.203(0.8), 2.584(0.7),
Click Here for Large Lucasite-(Ce) Structure Window Crystal Structure:

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Nickel E H , Grey I E , Madsen I C , American Mineralogist , 72 (1987) p.1006-1010, Lucasite-(Ce), CeTi2(O,OH)6, a new mineral from Western Australia: Its, description and structure

 

Physical Properties of Lucasite-(Ce)

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Brown, Dark brown, Chocolate brown.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Habit: Habit: Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luster: Luster: Resinous
Help on Streak: Streak: white
 

Optical Properties of Lucasite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2642,KC= 0.2688
Ncalc = 2.34
Help on Optical Data: Optical Data: Biaxial (?), b=2.321
Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on RL Color: RL Color: Gray with brown internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Lucasite-(Ce) in Air
λ R  ∑ R(λ) 
 470 nm   16.60   
 546 nm   15.60 
 589 nm   15.30 
 650 nm   15.00 
Calculated Relative Intensity Colors of Lucasite-(Ce) in Air
Relative
Intensity		    0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540% 580%
R                        
 

Calculated Properties of Lucasite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.54 gm/cc
note: Specific Gravity of Lucasite-(Ce) =5.00 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PELucasite-(Ce) = 219.25 barns/electron
U=PELucasite-(Ce) x relectron= 994.58 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 40,733.02 (Gamma Ray American Petroleum Institute Units)
Concentration of Lucasite-(Ce) per GRapi unit = 24.55 (PPM)

Lucasite-(Ce) 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) 746.73 ±186.68 grams of pure Lucasite-(Ce) .

Estimated Radioactivity from Lucasite-(Ce) - weak
Specimen
Size
Weight/Volume
(Sphere) *		 Calculated
Activity
Becquerels
(Bq)		 Calculated
Activity
Curies (Ci)		 Estimated
Activity
GR(api)		 Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 7.26 cm 942,857 2.55E-05 40,733.02 13.39
100 gm / 3.37 cm 94,286 2.55E-06 4,073.30 1.34
10 gm / 1.56 cm 9,429 2.55E-07 407.33 0.13
1 gm / 7.26 mm 943 2.55E-08 40.73 0.01
0.1 gm / 3.37 mm 94 2.55E-09 4.07 0.00
0.01 gm / 1.56 mm 9 2.55E-10 0.41 0.00
0.001 gm / 0.73 mm 1 2.55E-11 0.04 0.00

Weight of pure Lucasite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.00 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 ( 2.10 % Th) From Sum REE Elements (42.09 % REE)
 

Lucasite-(Ce) Classification
Help on Dana Class: Dana Class: 08.03.05.01 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.03)where A (B2O6)
  (08.03.05)Dana Group
 
08.03.05.01 Lucasite-(Ce) CeTi2(O,OH)6 I2/a 2/m
Help on Strunz Class: Strunz Class: 04.DH.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DH -With large (± medium-sized) cations; sheets of edge-sharing octahedra
 
04.DH.10 Kassite CaTi2O4(OH)2 P 21/a 2/m
 
04.DH.10 Lucasite-(Ce) CeTi2(O,OH)6 I2/a 2/m
 

Other Lucasite-(Ce) Information
Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Am.Min.,Vol.72,p1006-1010,1987) OPTIC PROP.(Am.Min.,Vol.72, p1006-1010,1987)
Help on See Also: See Also: Links to other databases for Lucasite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Print or Cut-and-Paste your Lucasite-(Ce) Specimen Label here :

Lucasite-(Ce)

CeTi2(O,OH)6
Dana No: 08.03.05.01 Strunz No: 04.DH.10
Locality:

 

Notes: