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Orthochevkinite Mineral Data

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General Orthochevkinite Information

Help on Chemical  Formula: Chemical Formula: (Ce,La,Ca,Na,Th)4(Fe++,Mg)2(Ti,Fe+++)3Si4O22
Help on Composition: Composition: Molecular Weight = 1,170.75 gm
   Sodium      0.79 %  Na    1.06 % Na2O
   Calcium     2.05 %  Ca    2.87 % CaO
   Lanthanum  14.24 %  La   16.70 % La2O3
   Cerium     14.36 %  Ce   16.82 % Ce2O3
   Thorium     7.93 %  Th    9.02 % ThO2
   Magnesium   1.04 %  Mg    1.72 % MgO
   Titanium    9.20 %  Ti   15.35 % TiO2
   Iron       10.73 %  Fe    9.21 % FeO /  5.12 % Fe2O3
   Silicon     9.60 %  Si   20.53 % SiO2
   Oxygen     30.07 %  O
             ______        ______ 
             100.00 %       98.39 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce1.2La1.2Ca0.6Na0.4Th0.4Fe2+1.5Mg0.5Ti2.25Fe3+0.75Si4O22
Help on Environment: Environment: Alkaline syenite pegmatites. An incompletely characterized material. Physical properties by analogy with chevkinite.
Help on IMA Status: IMA Status: Not Approved IMA 1920
Help on Locality: Locality: Ifazina-Itorendrika Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as a possible orthorhombic form of chevkinite.
 

Orthochevkinite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.3448:1:3.7931
Help on Cell Dimensions: Cell Dimensions: a = 13.6, b = 5.8, c = 22, Z = 4; V = 1,735.36 Den(Calc)= 4.48
Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.15(1), 2.7(0.7), 3.78(0.7),1.69(0.5), 1.49(0.4), 2.53(0.4), 2.88(0.4),
 

Physical Properties of Orthochevkinite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Resinous - Greasy
Help on Streak: Streak: black
 

Optical Properties of Orthochevkinite

Help on Optical Data: Optical Data: NCalc= 1.95 - from Gladstone-Dale relationship (KC = 0.212) where Ncalc=Dcalc*KC+1
 

Calculated Properties of Orthochevkinite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.11 gm/cc
note: Specific Gravity of Orthochevkinite =4.48 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEOrthochevkinite = 326.86 barns/electron
U=PEOrthochevkinite x relectron=1,341.82 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 154,977.55 (Gamma Ray American Petroleum Institute Units)
Concentration of Orthochevkinite per GRapi unit = 6.45 (PPM)

Orthochevkinite 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) 196.26 ± 49.07 grams of pure Orthochevkinite .

Estimated Radioactivity from Orthochevkinite - strong
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 / 7.53 cm 3,551,676 9.60E-05 154,977.55 50.95
100 gm / 3.49 cm 355,168 9.60E-06 15,497.76 5.10
10 gm / 1.62 cm 35,517 9.60E-07 1,549.78 0.51
1 gm / 7.53 mm 3,552 9.60E-08 154.98 0.05
0.1 gm / 3.49 mm 355 9.60E-09 15.50 0.01
0.01 gm / 1.62 mm 36 9.60E-10 1.55 0.00
0.001 gm / 0.75 mm 4 9.60E-11 0.15 0.00

Weight of pure Orthochevkinite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.48 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
 

Orthochevkinite Classification

Help on  Dana Class: Dana Class: 56.02.08.04 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.08)Perierite - Chevkinite group
 
56.02.08.01 Chevkinite-(Ce) (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 2/m 2/m
 
56.02.08.02 Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m
 
56.02.08.03 Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m
 
56.02.08.04 Orthochevkinite* (Ce,La,Ca,Na,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 Unk Ortho
 
56.02.08.05 Rengeite! Sr4ZrTi4Si4O22 P 21/a 2/m
 
56.02.08.06 Matsubaraite! Sr4TiTi4Si4O22 P 21/a 2/m
 
56.02.08.07 Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m
 
56.02.08.08 Maoniupingite-(Ce)! (REE,Ca)4(Fe,Ti,Fe,[])(Ti,Fe,Fe,Nb)4Si4O22 C 2/m 2/m
 
56.02.08.09 Dingdaohengite-(Ce)! (Ce,La)4Fe(Ti,Fe,Mg,Fe)2Ti2Si4O22 P 21/a (pseudo-C 2/m) 2/m
Help on  Strunz Class: Strunz Class: 09.BE.07.0 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.07.0 Orthochevkinite* (Ce,La,Ca,Na,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 Unk Ortho
 

Other Orthochevkinite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Orthochevkinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Orthochevkinite

(Ce,La,Ca,Na,Th)4(Fe++,Mg)2(Ti,Fe+++)3Si4O22
Dana No: 56.02.08.04 Strunz No: 09.BE.07.0
Locality:

 

Notes:

 

 
   
 


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