Strontiochevkinite Mineral Data

General Strontiochevkinite Information

Chemical Formula:

(Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22

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

Empirical Formula:

Sr₃REEFe²⁺Zr_0.5Ti_3.5Si₄O₂₂

IMA Status:

Approved IMA 1983

Locality:

Siama alkalic complex in Liaoning Province, China. Link to MinDat.org Location Data.

Name Origin:

Named as the Sr analog of chevkinite.

Synonym:

Saimaite

Strontiochevkinite Crystallography

Axial Ratios:

a:b:c =2.4502:1:2.1007

Cell Dimensions:

a = 13.8934, b = 5.6703, c = 11.912, Z = 2; beta = 114.083° V = 856.74 Den(Calc)= 4.42

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/I_o): 3.01(1), 1.97(0.75), 2.19(0.7),

Physical Properties of Strontiochevkinite

Color:

Brownish black, Gray.

Density:

5.44

Diaphaneity:

Opaque

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Sub Metallic

Streak:

brown

Optical Properties of Strontiochevkinite

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

Electron Density:

Bulk Density (Electron Density)=4.11 gm/cc
note: Specific Gravity of Strontiochevkinite =4.42 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_{Strontiochevkinite}= 113.13 barns/electron
U=PE_{Strontiochevkinite} x r_electron= 464.86 barns/cc.

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

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

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

References:

PHYS. PROP.(AmMin, Vol 85, p 1844)

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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Strontiochevkinite

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

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