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Chevkinite-(Ce) Mineral Data

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General Chevkinite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: (Ce,La,Ca,Th)4(Fe++,Mg)2(Ti,Fe+++)3Si4O22
Help on Composition: Composition: Molecular Weight = 1,205.27 gm
   Calcium     2.66 %  Ca    3.72 % CaO
   Lanthanum  16.13 %  La   18.92 % La2O3
   Cerium     19.76 %  Ce   23.15 % Ce2O3
   Thorium     1.93 %  Th    2.19 % ThO2
   Magnesium   0.40 %  Mg    0.67 % MgO
   Titanium    9.93 %  Ti   16.57 % TiO2
   Iron       10.66 %  Fe   10.73 % FeO /  3.31 % Fe2O3
   Silicon     9.32 %  Si   19.94 % SiO2
   Oxygen     29.20 %  O
             ______        ______ 
             100.00 %       99.20 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce1.7La1.4Ca0.8Th0.1Fe2+1.8Mg0.2Ti2.5Fe3+0.5Si4O22
Help on Environment: Environment: Secondary mineral in titanium and cerium bearing rocks and as an accessory mineral in some granites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1839
Help on Locality: Locality: Miask in the Ilmen Mountains, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for General Konstatin Vladimirovich Tschevkin [Chevkin] (1802-1875), Chief o f Staff of the Russian Mining Engineers Corps.
Help on Name Pronunciation: Name Pronunciation: Chevkinite-(Ce) + Pronunciation Say CHEVKINITE-(CE)
Help on Synonym: Synonym: Tscheffkinite

Chevkinite-(Ce) Image

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Comments: Dark brown crystal of chevkinite-(Ce).
Location: Miass, Central Ural Mountains, Russia. Scale: 3 cm.
© Dave Barthelmy

Chevkinite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.3298:1:1.9261
Help on Cell Dimensions: Cell Dimensions: a = 13.56, b = 5.82, c = 11.21, Z = 2; beta = 100.75° V = 869.16 Den(Calc)= 4.61
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.71(1), 3.14(1), 3.17(1),

Physical Properties of Chevkinite-(Ce)

Help on Cleavage: Cleavage: None
Help on Color: Color: Brownish black, Dark red.
Help on Density: Density: 4.5
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent to opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: black

Optical Properties of Chevkinite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.066 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2198,KPDmeas= 0.2252,KC= 0.2113
Ncalc = 1.95 - 1.97
Help on Optical Data: Optical Data: Biaxial (-), a=1.967-1.973, b=2.02, g=2.05, bire=0.0770-0.0830
Help on Pleochroism (x): Pleochroism (x): nearly colorless.
Help on Pleochroism (y): Pleochroism (y): pale reddish brown.
Help on Pleochroism (z): Pleochroism (z): dark reddish brown.

Calculated Properties of Chevkinite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.23 gm/cc
note: Specific Gravity of Chevkinite-(Ce) =4.61 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEChevkinite-(Ce) = 225.16 barns/electron
U=PEChevkinite-(Ce) x relectron= 951.82 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 37,661.04 (Gamma Ray American Petroleum Institute Units)
Concentration of Chevkinite-(Ce) per GRapi unit = 26.55 (PPM)

Chevkinite-(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) 807.64 ±201.91 grams of pure Chevkinite-(Ce) .

Estimated Radioactivity from Chevkinite-(Ce) - weak
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 7.45 cm 862,490 2.33E-05 37,661.04 12.38
100 gm / 3.46 cm 86,249 2.33E-06 3,766.10 1.24
10 gm / 1.61 cm 8,625 2.33E-07 376.61 0.12
1 gm / 7.45 mm 862 2.33E-08 37.66 0.01
0.1 gm / 3.46 mm 86 2.33E-09 3.77 0.00
0.01 gm / 1.61 mm 9 2.33E-10 0.38 0.00
0.001 gm / 0.75 mm 1 2.33E-11 0.04 0.00

Weight of pure Chevkinite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.61 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

Chevkinite-(Ce) Classification

Help on  Dana Class: Dana Class: (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 Chevkinite-(Ce) (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 2/m 2/m Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m Orthochevkinite* (Ce,La,Ca,Na,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 Unk Ortho Rengeite! Sr4ZrTi4Si4O22 P 21/a 2/m Matsubaraite! Sr4TiTi4Si4O22 P 21/a 2/m Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m Maoniupingite-(Ce)! (REE,Ca)4(Fe,Ti,Fe,[])(Ti,Fe,Fe,Nb)4Si4O22 C 2/m 2/m 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.70 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
09.BE.70 Chevkinite-(Ce) (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 2/m 2/m
09.BE.70 Karnasurtite-(Ce) (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)2O7(OH)4•3(H2O)(?) Unk. Hex
09.BE.70 Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m
09.BE.70 Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m
09.BE.70 Rengeite! Sr4ZrTi4Si4O22 P 21/a 2/m
09.BE.70 Maoniupingite-(Ce)! (REE,Ca)4(Fe,Ti,Fe,[])(Ti,Fe,Fe,Nb)4Si4O22 C 2/m 2/m
09.BE.70 Matsubaraite! Sr4TiTi4Si4O22 P 21/a 2/m
09.BE.70 Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m
09.BE.70 Dingdaohengite-(Ce)! (Ce,La)4Fe(Ti,Fe,Mg,Fe)2Ti2Si4O22 P 21/a (pseudo-C 2/m) 2/m

Other Chevkinite-(Ce) Information

Help on References: References: NAME( AntBidBlaNic2) 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 Chevkinite-(Ce) :
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 (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - Uranium Minerals

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Dana No: Strunz No: 09.BE.70





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