Orthochevkinite Mineral Data (original) (raw)

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.

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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:

OrthorhombicSpace 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

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor 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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Ask about Orthochevkinite here :
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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: