Lucasite-(Ce) Mineral Data

Lucasite-(Ce) Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About



[How the Club Works] [Memberships - Junior, Deluxe , and Platinum] [FAQ] [Past Minerals]
Join the Club - Junior, Deluxe and Platinum Memberships Available
High Quality Minerals Sent to Your Home or School Each Month
Mineral of the Month Club - An Inexpensive Way to Enjoy Minerals


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

Click Here for Larger Lucasite-(Ce) Image in a New Browser Window Images:
Click Here for Larger Lucasite-(Ce) Image

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
 Help on Above


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
Bequerols
(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 - 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
12 - Ruff.Info
13 - WWW-MINCRYST

Search for Lucasite-(Ce) using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Lucasite-(Ce) :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

Excalibur Minerals

Exceptional Minerals

Fabre Minerals

Heliodor

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Lucasite-(Ce) Mineral Data :

Ask about Lucasite-(Ce) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: