Cervandonite-(Ce) Mineral Data

Cervandonite-(Ce) Mineral Data

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General Cervandonite-(Ce) Information

Chemical Formula:

(Ce,Nd,La)(Fe+++,Fe++,Ti++++,Al)3SiAs(Si,As)O13

Composition:

Molecular Weight = 634.48 gm

Lanthanum 4.38 % La 5.14 % La₂O₃

Cerium 8.83 % Ce 10.35 % Ce₂O₃

Yttrium 1.40 % Y 1.78 % Y₂O₃

Thorium 3.66 % Th 4.16 % ThO₂

Titanium 6.79 % Ti 11.33 % TiO₂

Aluminum 2.13 % Al 4.02 % Al₂O₃

Iron 14.08 % Fe 13.59 % FeO / 5.03 % Fe₂O₃

Silicon 8.41 % Si 17.99 % SiO₂

Arsenic 12.99 % As 19.92 % As₂O₅

Neodymium 4.55 % Nd 5.30 % Nd₂O₃

Oxygen 32.78 % O

______ ______

100.00 % 98.61 % = TOTAL OXIDE

Empirical Formula:

Ce_0.4Nd_0.2La_0.2Y_0.1Th_0.1Fe²⁺_1.2Ti_0.9Al_0.5Fe³⁺_0.4Si_1.9As_1.1O₁₃

Environment:

Fissure veins in gneiss.

IMA Status:

Approved IMA 1988

Locality:

Pizzo Cervandone, Alpe Devero, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

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Cervandonite-(Ce) Crystallography

Axial Ratios:

a:b:c =0.577:1:0.37

Cell Dimensions:

a = 11.269, b = 19.527, c = 7.226, Z = 6; beta = 121.35° V = 1,357.94 Den(Calc)= 4.65

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Cm ?

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

By Intensity(I/I_o): 2.8785(1), 3.253(0.9), 5.39(0.8),

Physical Properties of Cervandonite-(Ce)

Cleavage:

[001] Indistinct

Color:

Black.

Diaphaniety:

Translucent to Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

5 - Apatite

Luster:

Adamantine

Streak:

brownish black

Optical Properties of Cervandonite-(Ce)

Optical Data:

Biaxial (?), a=1.99, g=2, bire=0.0100

Pleochroism (x):

yellow.

Pleochroism (y):

yellowish brown.

Pleochroism (z):

brown.

Calculated Properties of Cervandonite-(Ce)

Electron Density:

r_electron=4.31 gm/cc
note: r_{Cervandonite-(Ce)}=4.65 gm/cc.

Fermion Index

Fermion Index = 0.0252
Boson Index = 0.9748

Photoelectric:

PE_{Cervandonite-(Ce)}= 189.69 barns/electron
U=PE_{Cervandonite-(Ce)} x r_electron= 818.29 barns/cc.

Radioactivity:

GRapi = 72,378.18 (Gamma Ray American Petroleum Institute Units)

Cervandonite-(Ce) 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) 420.25 ±105.06 grams of pure Cervandonite-(Ce) .

**Estimated Radioactivity from Cervandonite-(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 / 7.43 cm	1,638,408	4.43E-05	72,378.18	23.80
100 gm / 3.45 cm	163,841	4.43E-06	7,237.82	2.38
10 gm / 1.60 cm	16,384	4.43E-07	723.78	0.24
1 gm / 7.43 mm	1,638	4.43E-08	72.38	0.02
0.1 gm / 3.45 mm	164	4.43E-09	7.24	0.00
0.01 gm / 1.60 mm	16	4.43E-10	0.72	0.00
0.001 gm / 0.74 mm	2	4.43E-11	0.07	0.00

Weight of pure Cervandonite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.65 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

Cervandonite-(Ce) Classification

Dana Class:

43.4.12.1 (43)Compound Phosphates, etc.

(43.4)(Anhydrous Compound Anions With Hydroxyl or Halogen)

(43.4.12)Dana Group

43.4.12.1 Cervandonite-(Ce) (Ce,Nd,La)(Fe,Fe,Ti,Al)3SiAs(Si,As)O13 Cm ? m

Strunz Class:

VIII/D.11-10 VIII - Silicates

VIII/D - Unclassified silicates, mostly cations of small size Mg, Fe, Mn, Cu

VIII/D.11 - Cervandonite-(Ce) series

VIII/D.11-10 Cervandonite-(Ce) (Ce,Nd,La)(Fe,Fe,Ti,Al)3SiAs(Si,As)O13 Cm ? m

Other Cervandonite-(Ce) Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.75,p932,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Cervandonite-(Ce) :
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

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

Cervandonite-(Ce)

(Ce,Nd,La)(Fe+++,Fe++,Ti++++,Al)3SiAs(Si,As)O13
Dana No: 43.4.12.1 Strunz No: VIII/D.11-10
Locality:

Notes: