Aluminocerite-(Ce) Mineral Data

General Aluminocerite-(Ce) Information

Chemical Formula:

(Ce,REE,Ca)9(Al,Fe+++)(SiO4)3[SiO3(OH)]4(OH)3

Composition:

Molecular Weight = 1,725.28 gm

Calcium 6.04 % Ca 8.45 % CaO

Lanthanum 6.44 % La 7.55 % La₂O₃

Cerium 20.22 % Ce 23.69 % Ce₂O₃

Praeseodymium 3.10 % Pr 3.63 % Pr₂O₃

Samarium 3.83 % Sm 4.45 % Sm₂O₃

Gadolinium 2.73 % Gd 3.15 % Gd₂O₃

Dysprosium 0.38 % Dy 0.43 % Dy₂O₃

Yttrium 1.34 % Y 1.70 % Y₂O₃

Ytterbium 0.10 % Yb 0.11 % Yb₂O₃

Aluminum 1.33 % Al 2.51 % Al₂O₃

Iron 0.32 % Fe 0.46 % Fe₂O₃

Silicon 11.40 % Si 24.38 % SiO₂

Hydrogen 0.41 % H 3.69 % H₂O

Neodymium 13.54 % Nd 15.80 % Nd₂O₃

Oxygen 28.80 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_2.6Ce_2.49Nd_1.62La_0.8Sm_0.44Pr_0.38Gd_0.3Y_0.26Dy_0.04Yb_0.01Al_0.85Fe³⁺_0.1(SiO₄)₃ (SiO₃)₄(OH)₄(OH)_3.06

Environment:

Found in millimeter-sized secondary cavities hosted in aplite-pegmatite veins and pods within pink granite. Cerite group.

IMA Status:

Approved IMA 2007 (Dana # Added)

Locality:

Ratti quarry, Baveno, Verbania, Piemonte region, Italy. Link to MinDat.org Location Data.

Name Origin:

Named as the Al-dominant analog of cerite-(Ce).

Synonym:

IMA2007-060

Aluminocerite-(Ce) Image

Images:

Aluminocerite-(Ce)

Comments: BSE image of the holotype of aluminocerite-(Ce) showing pseudo-octahedral to rombohedral crystals flattened on the c axis. (AmMin v94:488).
Location: Ratti quarry near Baveno, Italy.. Scale: See Image.
© American Mineralogist

Aluminocerite-(Ce) Crystallography

Axial Ratios:

a:c = 1:3.58491

Cell Dimensions:

a = 10.581, c = 37.932, Z = 6; V = 3,677.82 Den(Calc)= 4.67

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3c

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

By Intensity(I/I_o): 2.914(1), 2.647(0.58), 1.732(0.46),2.198(0.4), 1.923(0.34), 3.405(0.27), 3.25(0.26), 1.826(0.24),

Physical Properties of Aluminocerite-(Ce)

Cleavage:

None

Color:

Pale pink, Reddish pink.

Diaphaneity:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Pseudo Octohedral - Crystals show an octohedral outline.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Aluminocerite-(Ce)

Gladstone-Dale:

CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1745,KC= 0.1729
Ncalc = 1.81

Optical Data:

Uniaxial (+), w=1.81-1.816, e=1.812-1.822, bire=0.0020-0.0060.

Calculated Properties of Aluminocerite-(Ce)

Electron Density:

Bulk Density (Electron Density)=4.27 gm/cc
note: Specific Gravity of Aluminocerite-(Ce) =4.67 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_{Aluminocerite-(Ce)}= 277.84 barns/electron
U=PE_{Aluminocerite-(Ce)} x r_electron=1,186.44 barns/cc.

Radioactivity:

GRapi = 49,327.07 (Gamma Ray American Petroleum Institute Units)
Concentration of Aluminocerite-(Ce) per GRapi unit = 20.27 (PPM)

Aluminocerite-(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) 616.63 ±154.16 grams of pure Aluminocerite-(Ce) .

**Estimated Radioactivity from Aluminocerite-(Ce)** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.42 cm	1,132,852	3.06E-05	49,327.07	16.22
100 gm / 3.45 cm	113,285	3.06E-06	4,932.71	1.62
10 gm / 1.60 cm	11,329	3.06E-07	493.27	0.16
1 gm / 7.42 mm	1,133	3.06E-08	49.33	0.02
0.1 gm / 3.45 mm	113	3.06E-09	4.93	0.00
0.01 gm / 1.60 mm	11	3.06E-10	0.49	0.00
0.001 gm / 0.74 mm	1	3.06E-11	0.05	0.00

Weight of pure Aluminocerite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.67 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 ( 2.52 % Th) From Sum REE Elements (50.36 % REE)

Aluminocerite-(Ce) Classification

Dana Class:

52.04.06.03 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.04)with cations in [6] and/or > [6] coordination

(52.04.06)Cerite Group

52.04.06.01 Cerite-(Ce) Ce9Fe(SiO4)6[(SiO3)(OH)](OH)3 R 3c 3m

52.04.06.02 Cerite-(La)! (La,Ce,Ca)9(Mg,Fe)(SiO4)6[SiO3(OH)](OH)3 R 3c 3m

52.04.06.03 Aluminocerite-(Ce)! (Ce,REE,Ca)9(Al,Fe)(SiO4)3[SiO3(OH)]4(OH)3 R 3c 3m

Strunz Class:

09.AG.20 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AG -Nesosilicates with additional anions; cations in > [6] ± [6] coordination

09.AG.20 Cerite-(Ce) Ce9Fe(SiO4)6[(SiO3)(OH)](OH)3 R 3c 3m

09.AG.20 Cerite-(La)! (La,Ce,Ca)9(Mg,Fe)(SiO4)6[SiO3(OH)](OH)3 R 3c 3m

09.AG.20 Aluminocerite-(Ce)! (Ce,REE,Ca)9(Al,Fe)(SiO4)3[SiO3(OH)]4(OH)3 R 3c 3m

Other Aluminocerite-(Ce) Information

References:

NAME( AmMin, v94:487) PHYS. PROP.(AmMin, v94:487) OPTIC PROP.(AmMin, v94:487)

See Also:

Links to other databases for Aluminocerite-(Ce) :
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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Print or Cut-and-Paste your Aluminocerite-(Ce) Specimen Label here :

Aluminocerite-(Ce)

(Ce,REE,Ca)9(Al,Fe+++)(SiO4)3[SiO3(OH)]4(OH)3
Dana No: 52.04.06.03 Strunz No: 09.AG.20
Locality:

Notes: