General Strontiochevkinite Information
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Chemical Formula: |
(Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 |
Composition: |
Molecular Weight = 1,140.23 gm |
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Strontium 23.05 % Sr 27.26 % SrO |
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La,Ce,Pr,Nd,Sm, 12.63 % RE 14.73 % REE2O3 |
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Zirconium 4.00 % Zr 5.40 % ZrO2 |
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Titanium 14.70 % Ti 24.52 % TiO2 |
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Iron 4.90 % Fe 6.30 % FeO |
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Silicon 9.85 % Si 21.08 % SiO2 |
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Oxygen 30.87 % O |
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______ ______ |
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100.00 % 99.30 % = TOTAL OXIDE |
Empirical Formula: |
Sr3REEFe2+Zr0.5Ti3.5Si4O22 |
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: |
Siamaite |
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Images:
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Strontiochevkinite Crystallography
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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 - PrismaticH-M Symbol (2/m) Space Group: C 2/a |
X Ray Diffraction: |
By Intensity(I/Io): 3.01(1), 1.97(0.75), 2.19(0.7), |
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Physical Properties of Strontiochevkinite
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Color: |
Brownish black, Gray. |
Density: |
5.44 |
Diaphaniety: |
Opaque |
Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
Hardness: |
5-6 - Between Apatite and Orthoclase |
Luster: |
Sub Metallic |
Streak: |
brown |
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Optical Properties of Strontiochevkinite
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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 |
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Calculated Properties of Strontiochevkinite
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Electron Density: |
relectron=4.11 gm/cc note: rStrontiochevkinite =4.42 gm/cc. |
Fermion Index |
Fermion Index = 0.06891 Boson Index = 0.93109 |
Photoelectric: |
PEStrontiochevkinite = 113.13 barns/electron U=PEStrontiochevkinite x relectron= 464.86 barns/cc. |
Radioactivity: |
GRapi = 12,568.09 (Gamma Ray American Petroleum Institute Units)
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 |
12,568.09 |
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)
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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)
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Strontiochevkinite Classification
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Dana Class: |
56.2.8.2 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O |
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(56.2)with cations in [4] and/or >[4] coordination |
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(56.2.8)Perierite - Chevkinite group |
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56.2.8.1 Chevkinite-(Ce) (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 2/m 2/m |
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56.2.8.2 Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m |
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56.2.8.3 Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m |
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56.2.8.4 Orthochevkinite* (Ce,La,Ca,Na,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 Unk Ortho |
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56.2.8.5 Rengeite! Sr4ZrTi4Si4O22 P 21/a 2/m |
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56.2.8.6 Matsubaraite! Sr4TiTi4Si4O22 P 21/a 2/m |
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56.2.8.7 Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m |
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56.2.8.8 IMA2003-017! (REE,Ca)4(Fe,Ti,Fe,[])(Ti,Fe,Fe,Nb)4Si4O22 C 2/m 2/m |
Strunz Class: |
VIII/E.07-30* VIII - Silicates |
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VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8- |
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VIII/E.07 - Labuntsovite Group |
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VIII/E.07-10 Korobitsynite! Na3(Ti,Nb)2[Si4O12](OH,O)2·3-4(H2O) Pbam 2/m 2/m 2/m |
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VIII/E.07-20 Nenadkevichite (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O) Pbam 2/m 2/m 2/m |
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VIII/E.07-30* Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m |
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VIII/E.07-30 Tsepinite-Na! (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2·3(H2O) Cm m |
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VIII/E.07-32 Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2·3(H2O) Cm m |
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VIII/E.07-33 Tsepinite-Ca! (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m |
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VIII/E.07-34 Paratsepinite-Ba! (Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m |
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VIII/E.07-40 Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2·4(H2O) Cm m |
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VIII/E.07-50 Clinophosinaite! Na3CaPSiO7 P 2/c 2/m |
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VIII/E.07-50* Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8(H2O) Cm m |
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VIII/E.07-60* Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4·5(H2O) C 2/m 2/m |
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VIII/E.07-60 Phosinaite-(Ce)! Na13Ca2Ce[Si4O12](PO4)4 P 22121 2 2 2 |
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VIII/E.07-70 Gjerdingenite-Fe! K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]·4(H2O) C 2/m 2/m |
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VIII/E.07-80 Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m |
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VIII/E.07-90 Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m |
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VIII/E.07-100 Lemmleinite-K! NaK2(Ti,Nb)2Si4O12(O,OH)2·2(H2O) C 2/m 2/m |
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VIII/E.07-110 Lemmleinite-Ba! Na2K2Ba1-xTi4(Si4O12)2(O,OH)4·5(H2O) C 2/m 2/m |
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VIII/E.07-130 Paralabuntsovite-Mg! Na8K8Mg8Ti16(Si4O12)8(O,OH)16·n(H2O) I2/m 2/m |
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VIII/E.07-140 Labuntsovite-Mg! Na4K4(Ba,K)(Mg,Fe)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m |
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VIII/E.07-150 Labuntsovite-Fe! Na4K4(Ba,K)2(Fe,Mg,Mn)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m |
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VIII/E.07-155 Labuntsovite-Mn Na4K4(Ba,K)(Mn,Fe)1x(Ti,Nb)8[Si4O12]4(O,OH)8·n(H2O),n=10-12 I2/m 2/m |
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VIII/E.07-170 Parakuzmenkoite-Fe! (K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m |
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VIII/E.07-180 Organovaite-Zn! K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m |
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VIII/E.07-190 Organovaite-Mn! K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) Cm m |
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VIII/E.07-200 Gutkovaite-Mn! CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4·5(H2O) Cm m |
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VIII/E.07-205 Neskevaaraite-Fe! NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4·6(H2O) Cm m |
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VIII/E.07-210 Alsakharovite-Zn! NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m |
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VIII/E.07-220 Lepkhenelmite-Zn! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m |
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Other Strontiochevkinite Information
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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 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (MinSocAm)
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 -École des Mines de Paris
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Strontiochevkinite
(Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22
Dana No: 56.2.8.2 Strunz No: VIII/E.07-30*
Locality:
Notes:
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