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Strontiochevkinite Mineral Data

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General Strontiochevkinite Information

Help on Chemical  Formula: Chemical Formula: (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22
Help on Composition: Composition: Molecular Weight = 1,140.23 gm
   Strontium        23.05 %  Sr   27.26 % SrO
   La,Ce,Pr,Nd,Sm,  12.63 %  RE   14.73 % REE2O3
   Zirconium         4.00 %  Zr    5.40 % ZrO2
   Titanium         14.70 %  Ti   24.52 % TiO2
   Iron              4.90 %  Fe    6.30 % FeO
   Silicon           9.85 %  Si   21.08 % SiO2
   Oxygen           30.87 %  O
                   ______        ______ 
                   100.00 %       99.30 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Sr3REEFe2+Zr0.5Ti3.5Si4O22
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Siama alkalic complex in Liaoning Province, China. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Sr analog of chevkinite.
Help on Synonym: Synonym: Saimaite
 

Strontiochevkinite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.4502:1:2.1007
Help on Cell Dimensions: Cell Dimensions: a = 13.8934, b = 5.6703, c = 11.912, Z = 2; beta = 114.083° V = 856.74 Den(Calc)= 4.42
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.01(1), 1.97(0.75), 2.19(0.7),
 

Physical Properties of Strontiochevkinite

Help on Color: Color: Brownish black, Gray.
Help on Density: Density: 5.44
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: brown
 

Optical Properties of Strontiochevkinite

Help on Optical Data: Optical Data: NCalc= 1.98 - from Gladstone-Dale relationship (KC = 0.2222) where Ncalc=Dcalc*KC+1
NCalc= 2.21 - from Gladstone-Dale relationship (KC = 0.2222) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Strontiochevkinite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.11 gm/cc
note: Specific Gravity of Strontiochevkinite =4.42 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEStrontiochevkinite = 113.13 barns/electron
U=PEStrontiochevkinite x relectron= 464.86 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 12,568.10 (Gamma Ray American Petroleum Institute Units)
Concentration of Strontiochevkinite per GRapi unit = 79.57 (PPM)

Strontiochevkinite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Strontiochevkinite - 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 / 7.56 cm 283,906 7.67E-06 12,568.10 4.13
100 gm / 3.51 cm 28,391 7.67E-07 1,256.81 0.41
10 gm / 1.63 cm 2,839 7.67E-08 125.68 0.04
1 gm / 7.56 mm 284 7.67E-09 12.57 0.00
0.1 gm / 3.51 mm 28 7.67E-10 1.26 0.00
0.01 gm / 1.63 mm 3 7.67E-11 0.13 0.00
0.001 gm / 0.76 mm 0 7.67E-12 0.01 0.00

Weight of pure Strontiochevkinite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.42 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 ( 0.63 % Th) From Sum REE Elements (12.63 % REE)
 

Strontiochevkinite Classification

Help on  Dana Class: Dana Class: 56.02.08.02 (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.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 Strontiochevkinite Information

Help on References: References: PHYS. PROP.(AmMin, Vol 85, p 1844)
Help on See Also: See Also: Links to other databases for Strontiochevkinite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Strontiochevkinite

(Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22
Dana No: 56.02.08.02 Strunz No: 09.BE.70
Locality:

 

Notes:

 

 
   
 


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