Sazhinite-(Ce) Mineral Data

Sazhinite-(Ce) Mineral Data +

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General Sazhinite-(Ce) Information

Chemical Formula:

Na2Ce[Si6O14(OH)]·n(H2O), (n >= 1.5)

Composition:

Molecular Weight = 649.65 gm

Sodium 7.08 % Na 9.54 % Na₂O

Cerium 21.57 % Ce 25.26 % Ce₂O₃

Silicon 25.94 % Si 55.49 % SiO₂

Hydrogen 1.09 % H 9.71 % H₂O

Oxygen 44.33 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂·1.5(H₂O)CeSi₆O₁₄(OH)·1.5(H₂O)

Environment:

Cavities in sodalite zenoliths.

IMA Status:

Approved IMA 1974

Locality:

Mt. Karnasurt, Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Nikolai Petrovich Sazhin (1898-1969), Founder of the Russian rare-earth industry.

Synonym:

ICSD 36401

PDF 30-1176

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Sazhinite-(Ce) Crystallography

Axial Ratios:

a:b:c =0.4801:1:0.4705

Cell Dimensions:

a = 7.5, b = 15.62, c = 7.35, Z = 2; V = 861.05 Den(Calc)= 2.51

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pmm2

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.23(1), 3.37(0.75), 5.23(0.55),

Physical Properties of Sazhinite-(Ce)

Cleavage:

[100] Perfect, [010] Perfect, [001] Very Good

Color:

Gray, Gray white, Pearl white.

Density:

2.61

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Sazhinite-(Ce)

Gladstone-Dale:

CI meas= -0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.045 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2121,KPDmeas= 0.204,KC= 0.2029

Optical Data:

Biaxial (+), a=1.525, b=1.528, g=1.544, bire=0.0190, 2V(Calc)=48, 2V(Meas)=47.

Calculated Properties of Sazhinite-(Ce)

Electron Density:

r_electron=2.53 gm/cc
note: r_{Sazhinite-(Ce)}=2.61 gm/cc.

Fermion Index

Fermion Index = 0.01232
Boson Index = 0.98768

Photoelectric:

PE_{Sazhinite-(Ce)}= 103.85 barns/electron
U=PE_{Sazhinite-(Ce)} x r_electron= 262.85 barns/cc.

Radioactivity:

GRapi = 22,309.59 (Gamma Ray American Petroleum Institute Units)

Sazhinite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Sazhinite-(Ce)** - 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 / 9.01 cm	483,116	1.31E-05	22,309.59	7.33
100 gm / 4.18 cm	48,312	1.31E-06	2,230.96	0.73
10 gm / 1.94 cm	4,831	1.31E-07	223.10	0.07
1 gm / 9.01 mm	483	1.31E-08	22.31	0.01
0.1 gm / 4.18 mm	48	1.31E-09	2.23	0.00
0.01 gm / 1.94 mm	5	1.31E-10	0.22	0.00
0.001 gm / 0.90 mm	0	1.31E-11	0.02	0.00

Weight of pure Sazhinite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.61 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
Estimated Thorium Activity ( 1.08 % Th) From Sum REE Elements (21.57 % REE)

Sazhinite-(Ce) Classification

Dana Class:

72.2.1.3 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.2)with 4-, 6-, and 8-membered rings

(72.2.1)Dalylite group

72.2.1.1 Dalyite K2ZrSi6O15 P1 1

72.2.1.2 Davanite K2TiSi6O15 P1 1

72.2.1.3 Sazhinite-(Ce) Na2Ce[Si6O14(OH)]·n(H2O),(n>=1.5) Pmm2 mm2

72.2.1.4 IMA2002-042a! Na3La[Si6O15]·2(H2O) Pmm2 2/m 2/m 2/m

Strunz Class:

VIII/H.31-10 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.31 - Sazhinite-(Ce) series

VIII/H.31-10 Sazhinite-(Ce) Na2Ce[Si6O14(OH)]·n(H2O),(n>=1.5) Pmm2 mm2

Other Sazhinite-(Ce) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Sazhinite-(Ce) Specimen Label here :

Sazhinite-(Ce)

Na2Ce[Si6O14(OH)]·n(H2O), (n >= 1.5)
Dana No: 72.2.1.3 Strunz No: VIII/H.31-10
Locality:

Notes: