Uedaite-(Ce) Mineral Data

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General Uedaite-(Ce) Information

Chemical Formula:

Mn++CeAl2Fe++(Si2O7)(SiO4)O(OH)

Composition:

Molecular Weight = 584.87 gm

Calcium 1.78 % Ca 2.49 % CaO

Lanthanum 2.61 % La 3.06 % La₂O₃

Cerium 9.34 % Ce 10.94 % Ce₂O₃

Praeseodymium 1.69 % Pr 1.97 % Pr₂O₃

Samarium 1.29 % Sm 1.49 % Sm₂O₃

Gadolinium 0.54 % Gd 0.62 % Gd₂O₃

Yttrium 0.61 % Y 0.77 % Y₂O₃

Thorium 0.40 % Th 0.45 % ThO₂

Magnesium 0.04 % Mg 0.07 % MgO

Manganese 4.79 % Mn 6.19 % MnO

Aluminum 8.72 % Al 16.47 % Al₂O₃

Iron 12.80 % Fe 16.46 % FeO

Silicon 14.41 % Si 30.82 % SiO₂

Hydrogen 0.17 % H 1.54 % H₂O

Neodymium 5.67 % Nd 6.62 % Nd₂O₃

Oxygen 35.15 % O

______ ______

100.00 % 99.97 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.51Ca_0.26Ce_0.39Nd_0.23La_0.11Pr_0.07Sm_0.05Y_0.04Gd_0.02Th_0.01Al_1.89Fe²⁺_1.34Mg_0.01 (Si₂O₇)(SiO₄)O_0.85(OH)

Environment:

Found in a granite at a quarry. Epidote group

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Marutoku quarry, Shodoshima Island in Seto Inland Sea, Kagawa Prefecture, Japan Link to MinDat.org Location Data.

Name Origin:

Named for Tateo Ueda (1912-2000), who was the first to solve the crystal structure of allanite.

Synonym:

IMA2006-022

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Uedaite-(Ce) Crystallography

Axial Ratios:

a:b:c =1.5567:1:1.7741

Cell Dimensions:

a = 8.939, b = 5.742, c = 10.187, Z = 2; beta = 115.1° V = 473.50 Den(Calc)= 4.10

Crystal System:

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

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

By Intensity(I/I_o): 2.92(1), 3.53(0.54), 2.71(0.43),2.62(0.39), 8.03(0.26), 9.23(0.24), 2.87(0.23), 2.14(0.19),

Crystal Structure:

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Miyawaki R , Yokoyama K , Matsubara S , Tsutsumi Y , Goto A , European Journal of Mineralogy , 20 (2008) p.261-269, Uedaite-(Ce), a new member of the epidote group with Mn at the A site, from, Shodoshima, Kagawa Prefecture, Japan, Locality: Shodoshima Island, Kagawa Prefecture, western Japan

Physical Properties of Uedaite-(Ce)

Cleavage:

{001} Poor

Color:

Black, Dark brown.

Diaphaneity:

Translucent to Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

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

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous - Greasy

Streak:

gray

Optical Properties of Uedaite-(Ce)

Gladstone-Dale:

CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1878,KC= 0.1889
Ncalc = 1.77

Optical Data:

Biaxial (-), b=1.77

Calculated Properties of Uedaite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.88 gm/cc
note: Specific Gravity of Uedaite-(Ce) =4.10 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Uedaite-(Ce)= 125.07 barns/electron
U=PE_Uedaite-(Ce) x r_electron= 485.62 barns/cc.

Radioactivity:

GRapi = 8,088.79 (Gamma Ray American Petroleum Institute Units)
Concentration of Uedaite-(Ce) per GRapi unit = 123.63 (PPM)

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

**Estimated Radioactivity from Uedaite-(Ce)** - mild
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 / 7.75 cm	179,369	4.85E-06	8,088.79	2.66
100 gm / 3.60 cm	17,937	4.85E-07	808.88	0.27
10 gm / 1.67 cm	1,794	4.85E-08	80.89	0.03
1 gm / 7.75 mm	179	4.85E-09	8.09	0.00
0.1 gm / 3.60 mm	18	4.85E-10	0.81	0.00
0.01 gm / 1.67 mm	2	4.85E-11	0.08	0.00
0.001 gm / 0.78 mm	0	4.85E-12	0.01	0.00

Weight of pure Uedaite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.10 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

Uedaite-(Ce) Classification

Dana Class:

58.02.01a.10 (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)

(58.02.01a)Epidote group (Clinozoisite subgroup)

58.02.01a.01 Clinozoisite! Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01a.02 Epidote! Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01a.03 Epidote-(Pb)! (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01a.04 Mukhinite Ca2Al2V(SiO4)3(OH) P 2₁/m 2/m

58.02.01a.05 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01a.06 Piemontite-(Sr)! (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01a.07 Manganipiemontite-(Sr)! CaSr(Mn,Fe)2Al[Si3O12](OH) P 2₁/m 2/m

58.02.01a.08 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 2₁/a 2/m

58.02.01a.09 Clinozoisite-(Sr)! CaSrAl3(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.02.01a.10 Uedaite-(Ce)! MnCeAl2Fe(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.02.01a.11 Epidote-(Sr)! CaSrAl2Fe(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 Uedaite-(Ce) Information

References:

NAME( AmMin, v93:1944) PHYS. PROP.(AmMin, v93:1944) OPTIC PROP.(AmMin, v93:1944)

See Also:

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

Mn++CeAl2Fe++(Si2O7)(SiO4)O(OH)
Dana No: 58.02.01a.10 Strunz No: 09.BG.05b
Locality:

Notes: