Ferriallanite-(Ce) Mineral Data

General Ferriallanite-(Ce) Information

Chemical Formula:

CaCe(Fe+++,Fe++,Al)3[SiO4][Si2O7]O(OH)

Composition:

Molecular Weight = 613.85 gm

Calcium 7.05 % Ca 9.87 % CaO

Cerium 21.00 % Ce 24.60 % Ce₂O₃

Titanium 1.09 % Ti 1.82 % TiO₂

Manganese 0.63 % Mn 0.81 % MnO

Aluminum 2.99 % Al 5.65 % Al₂O₃

Iron 19.74 % Fe 10.89 % FeO / 16.13 % Fe₂O₃

Silicon 13.45 % Si 28.78 % SiO₂

Hydrogen 0.16 % H 1.47 % H₂O

Oxygen 33.88 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_0.97Ce_0.03Ce_0.89Ca_0.11Fe³⁺_0.8Ti_0.14Al_0.06Al_0.56Fe³⁺_0.44Fe²⁺_0.93Mn²⁺_0.07Si_0.94 Al_0.06O₄(Si₂O₇)O(OH)

Environment:

In an alkaline granitic pegmatite.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Mount Ylyn Khuren, Altia Range, Mongolian People's Republic. Link to MinDat.org Location Data.

Name Origin:

Named as the Fe3+ analogue of allanite-(Ce)

Synonym:

Cerine

IMA2000-041

Ferriallanite-(Ce) Image

Images:

Ferriallanite-(Ce) Kainosite-(Y)

Comments: Short prismatic black crystals of ferriallanite-(Ce) in white slightly weathered kainosite-(Y). Orange prisms are zircons of the first generation. Fragment of the holotype specimen.
Location: Neprimetnyi pegmatite, Mount Ulyn Khuren, Khaldzan Buragtag Massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia. Scale: Crystal Size 2 mm.
© Pavel M. Kartashov

Images:

Fergusonite-(Nd) Ferriallanite-(Ce)

Comments: Orange-brown ferusonite-(Nd) grains in ferriallanite-(Ce) zone of the vein. Main black inclusions are ferriallanite-(Ce) crystals. White matrix is mixture of calcian strontianite and strontian calcite.
Location: Tornebohmite vein, Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: FOV 1 cm.
© Pavel M. Kartashov

Ferriallanite-(Ce) Crystallography

Axial Ratios:

a:b:c =1.5356:1:1.7446

Cell Dimensions:

a = 8.962, b = 5.836, c = 10.182, Z = 2; beta = 115.02° V = 482.57 Den(Calc)= 4.22

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 2.18(1)(112,123,401), 2.14(0.8)(221,403,223,02.72(0.8)(120,013), 2.93(0.65)(113), 2.63(0.6)(311), 3.55(0.55)(211), 2.34(0.55)(

Physical Properties of Ferriallanite-(Ce)

Cleavage:

None

Color:

Black.

Density:

4.22

Diaphaneity:

Opaque to translucent

Fracture:

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

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.

Hardness:

6 - Orthoclase

Luster:

Vitreous - Resinous

Streak:

brown

Optical Properties of Ferriallanite-(Ce)

Gladstone-Dale:

CI meas= 0.049 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.049 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2022,KPDmeas= 0.2022,KC= 0.2127
Ncalc = 1.9

Optical Data:

Biaxial (-), a=1.825, b=1.855, g=1.88, bire=0.0550

RL Color:

Black with red or orange internal reflections.

Calculated Properties of Ferriallanite-(Ce)

Electron Density:

Bulk Density (Electron Density)=4.00 gm/cc
note: Specific Gravity of Ferriallanite-(Ce) =4.22 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Ferriallanite-(Ce)}= 110.12 barns/electron
U=PE_{Ferriallanite-(Ce)} x r_electron= 440.92 barns/cc.

Radioactivity:

GRapi = 21,252.92 (Gamma Ray American Petroleum Institute Units)
Concentration of Ferriallanite-(Ce) per GRapi unit = 47.05 (PPM)

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

**Estimated Radioactivity from Ferriallanite-(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 / 7.68 cm	470,393	1.27E-05	21,252.92	6.99
100 gm / 3.56 cm	47,039	1.27E-06	2,125.29	0.70
10 gm / 1.65 cm	4,704	1.27E-07	212.53	0.07
1 gm / 7.68 mm	470	1.27E-08	21.25	0.01
0.1 gm / 3.56 mm	47	1.27E-09	2.13	0.00
0.01 gm / 1.65 mm	5	1.27E-10	0.21	0.00
0.001 gm / 0.77 mm	0	1.27E-11	0.02	0.00

Weight of pure Ferriallanite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.22 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 ( 1.05 % Th) From Sum REE Elements (21.00 % REE)

Ferriallanite-(Ce) Classification

Dana Class:

58.02.01c.07 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)

(58.02.01c)Epidote group (Allanite subgroup)

58.02.01c.01 Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

58.02.01c.02 Allanite-(La)! Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01c.03 Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

58.02.01c.04 Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 2₁/m 2/m

58.02.01c.05 Dissakisite-(La)! (Ca,Fe,Th,La)(La,REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F)withLa>Ce P 2₁/m 2/m

58.02.01c.06 Manganiandrosite-(La)! (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01c.07 Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 2₁/m 2/m

58.02.01c.08 Vastmanlandite-(Ce)! (Ce,La)3CaAl2Mg2[Si2O7][SiO4]3F(OH)2 P 2₁/m 2/m

58.02.01c.09 Manganiandrosite-(Ce)! (Mn,Ca)(Ce,REE)AlMnMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.02.01c.10 Vanadoandrosite-(Ce)! (Mn,Ca)(REE)VAlMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

Strunz Class:

09.BG.05b 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;

09.BG.05b Allanite-(La)! Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

09.BG.05b Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

09.BG.05b Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

09.BG.05b Manganiandrosite-(La)! (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

09.BG.05b Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 2₁/m 2/m

09.BG.05b Manganiandrosite-(Ce)! (Mn,Ca)(Ce,REE)AlMnMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

09.BG.05b Vanadoandrosite-(Ce)! (Mn,Ca)(REE)VAlMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

09.BG.05b Dissakisite-(La)! (Ca,Fe,Th,La)(La,REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F)withLa>Ce P 2₁/m 2/m

09.BG.05b Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 2₁/m 2/m

09.BG.05b Uedaite-(Ce)! MnCeAl2Fe(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

Other Ferriallanite-(Ce) Information

References:

NAME( CanMin, 41:809) PHYS. PROP.(CanMin, 41:809) OPTIC PROP.(CanMin, 41:809)

See Also:

Links to other databases for Ferriallanite-(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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Ferriallanite-(Ce)

CaCe(Fe+++,Fe++,Al)3[SiO4][Si2O7]O(OH)
Dana No: 58.02.01c.07 Strunz No: 09.BG.05b
Locality:

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