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Crichtonite Mineral Data

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General Crichtonite Information

Help on Chemical  Formula: Chemical Formula: (Sr,La,Ce,Y)(Ti,Fe+++,Mn)21O38
Help on Composition: Composition: Molecular Weight = 1,772.61 gm
   Strontium   3.46 %  Sr    4.09 % SrO
   Lanthanum   1.57 %  La    1.84 % La2O3
   Cerium      0.79 %  Ce    0.93 % Ce2O3
   Yttrium     0.50 %  Y     0.64 % Y2O3
   Titanium   38.09 %  Ti   63.54 % TiO2
   Manganese   2.17 %  Mn    3.12 % Mn2O3
   Iron       17.96 %  Fe   12.56 % FeO / 11.71 % Fe2O3
   Lead        1.17 %  Pb    1.26 % PbO
   Oxygen     34.30 %  O
             ______        ______ 
             100.00 %       99.68 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Sr0.7La0.2Ce0.1Y0.1Pb0.1Ti14.1Fe2+3.1Fe3+2.6Mn3+0.7O38
Help on Environment: Environment: In alpine-type fissure veins.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1813
Help on Locality: Locality: St. Christopher, Bourg d'Oisans, Isere, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Sir Alexander A. Crichton (1763-1856), Scottish physician and mineral collector.
Help on Synonym: Synonym: ICSD 12122
  PDF 22-1121
 

Crichtonite Image

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  Crichtonite

Comments: Black crichtonite crystal in quartz.
Location: Kriegalptal, Binntal, Wallis (Valais), Switzerland. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Crichtonite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.00077
Help on Cell Dimensions: Cell Dimensions: a = 10.374, c = 20.756, Z = 3; V = 1,934.49 Den(Calc)= 4.56
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.131(1), 2.875(1), 3.39(1),
 

Physical Properties of Crichtonite

Help on Color: Color: Black.
Help on Density: Density: 4.46
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Metallic - Dull
Help on Streak: Streak: dark gray
 

Optical Properties of Crichtonite

Help on Optical Data: Optical Data: NCalc= 2.52 - from Gladstone-Dale relationship (KC = 0.3323) where Ncalc=Dcalc*KC+1
NCalc= 2.48 - from Gladstone-Dale relationship (KC = 0.3323) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Crichtonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.30 gm/cc
note: Specific Gravity of Crichtonite =4.56 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PECrichtonite = 47.08 barns/electron
U=PECrichtonite x relectron= 202.44 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 2,371.56 (Gamma Ray American Petroleum Institute Units)
Concentration of Crichtonite per GRapi unit = 421.66 (PPM)

Estimated Radioactivity from Crichtonite - mild
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 / 7.48 cm 52,812 1.43E-06 2,371.56 0.78
100 gm / 3.47 cm 5,281 1.43E-07 237.16 0.08
10 gm / 1.61 cm 528 1.43E-08 23.72 0.01
1 gm / 7.48 mm 53 1.43E-09 2.37 0.00
0.1 gm / 3.47 mm 5 1.43E-10 0.24 0.00
0.01 gm / 1.61 mm 1 1.43E-11 0.02 0.00
0.001 gm / 0.75 mm 0 1.43E-12 0.00 0.00

Weight of pure Crichtonite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.56 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 ( 0.12 % Th) From Sum REE Elements ( 2.36 % REE)
 

Crichtonite Classification

Help on  Dana Class: Dana Class: 08.05.01.03 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.05)Dana Type
  (08.05.01)Crichtonite group (ABC18 T2 O38)
 
08.05.01.01 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3
 
08.05.01.02 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3
 
08.05.01.03 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3
 
08.05.01.04 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3
 
08.05.01.05 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3
 
08.05.01.06 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3
 
08.05.01.07 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
08.05.01.08 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
08.05.01.09 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3
 
08.05.01.10 Cleusonite! Pb(U,U)(Ti,Fe,Fe)20(O,OH)38 R 3 3
 
08.05.01.11 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3
Help on  Strunz Class: Strunz Class: 04.CC.40 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.C - Metal:Oxygen = 2:3, 3:5, and Similar
  04.CC -With large and medium-sized cations
 
04.CC.40 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3
 
04.CC.40 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3
 
04.CC.40 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3
 
04.CC.40 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3
 
04.CC.40 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
04.CC.40 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
04.CC.40 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3
 
04.CC.40 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3
 
04.CC.40 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3
 
04.CC.40 Cleusonite! Pb(U,U)(Ti,Fe,Fe)20(O,OH)38 R 3 3
 
04.CC.40 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3
 

Other Crichtonite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Crichtonite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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

Crichtonite

(Sr,La,Ce,Y)(Ti,Fe+++,Mn)21O38
Dana No: 08.05.01.03 Strunz No: 04.CC.40
Locality:

 

Notes:

 

 
   
 


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