Manganiandrosite-(Ce) Mineral Data

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General Manganiandrosite-(Ce) Information

Chemical Formula:

(Mn++,Ca)(Ce,REE)AlMn+++Mn++(Si2O7)(SiO4)O(OH)

Composition:

Molecular Weight = 599.53 gm

Strontium 1.02 % Sr 1.21 % SrO

Calcium 2.81 % Ca 3.93 % CaO

Lanthanum 5.33 % La 6.25 % La₂O₃

Cerium 10.75 % Ce 12.59 % Ce₂O₃

Samarium 0.25 % Sm 0.29 % Sm₂O₃

Magnesium 0.16 % Mg 0.27 % MgO

Titanium 0.80 % Ti 1.33 % TiO₂

Manganese 20.43 % Mn 18.46 % MnO / 8.82 % Mn₂O₃

Aluminum 4.50 % Al 8.50 % Al₂O₃

Iron 2.14 % Fe 3.06 % Fe₂O₃

Silicon 14.05 % Si 30.07 % SiO₂

Hydrogen 0.17 % H 1.50 % H₂O

Neodymium 2.89 % Nd 3.37 % Nd₂O₃

Oxygen 34.69 % O

______ ______

100.00 % 99.65 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.6Ca_0.4Ce_0.46La_0.23Nd_0.12Sm_0.01Sr_0.07Ca_0.02Mn³⁺_0.63Fe³⁺_0.23Ti_0.1Mg_0.04Al Mn²⁺_0.96Mn³⁺_0.04(Si₂O₇)(SiO₄)(OH)

Environment:

Found in a Mesozoic eclogite-facies ophiolitic unit of the western Alps. Manganiandrosite-(Ce) has dominant Mn+++ in the M1 site. Epidote group; structure determined

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Praborna manganese mine, Saint-Marcel, Aosta valley, Italy. Link to MinDat.org Location Data.

Name Origin:

Commission on New Minerals, Nomenclature and Classification (CNMNC)

Synonym:

IMA2002-049

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Manganiandrosite-(Ce) Crystallography

Axial Ratios:

a:b:c =1.5512:1:1.7546

Cell Dimensions:

a = 8.901, b = 5.738, c = 10.068, Z = 2; beta = 113.425° V = 471.83 Den(Calc)= 4.22

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): 2.896(1), 2.662(0.58), 2.707(0.43),3.51(0.37), 2.713(0.34), 2.591(0.32), 2.185(0.31),

Crystal Structure:

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Cenki-Tok B , Ragu A , Armbruster T , Chopin C , Medenbach O , European Journal of Mineralogy , 18 (2006) p.569-582, New Mn- and rare-earth-rich epidote-group minerals in metacherts:, manganiandrosite-(Ce) and vanadoandrosite-(Ce), Locality: Praborna manganese mine, Saint-Marcel, Aosta valley, Alps, Italy

Physical Properties of Manganiandrosite-(Ce)

Cleavage:

None

Color:

Dark brown.

Diaphaneity:

Transparent

Luster:

Vitreous - Adamantine

Streak:

reddish brown

Optical Properties of Manganiandrosite-(Ce)

Gladstone-Dale:

CI calc= 0.149 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1754,KC= 0.206
Ncalc = 1.87

Optical Data:

Biaxial (+), a=1.74, 2V(Meas)=80.6. Dispersion RI > 1.74.

Calculated Properties of Manganiandrosite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.99 gm/cc
note: Specific Gravity of Manganiandrosite-(Ce) =4.22 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Manganiandrosite-(Ce)}= 102.75 barns/electron
U=PE_{Manganiandrosite-(Ce)} x r_electron= 409.48 barns/cc.

Radioactivity:

GRapi = 19,371.54 (Gamma Ray American Petroleum Institute Units)
Concentration of Manganiandrosite-(Ce) per GRapi unit = 51.62 (PPM)

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

**Estimated Radioactivity from Manganiandrosite-(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 / 7.68 cm	430,783	1.16E-05	19,371.54	6.37
100 gm / 3.56 cm	43,078	1.16E-06	1,937.15	0.64
10 gm / 1.65 cm	4,308	1.16E-07	193.72	0.06
1 gm / 7.68 mm	431	1.16E-08	19.37	0.01
0.1 gm / 3.56 mm	43	1.16E-09	1.94	0.00
0.01 gm / 1.65 mm	4	1.16E-10	0.19	0.00
0.001 gm / 0.77 mm	0	1.16E-11	0.02	0.00

Weight of pure Manganiandrosite-(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 ( 0.96 % Th) From Sum REE Elements (19.22 % REE)

Manganiandrosite-(Ce) Classification

Dana Class:

58.02.01c.09 (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 Manganiandrosite-(Ce) Information

References:

NAME( AmMin, v92:705) PHYS. PROP.(AmMin, v92:705) OPTIC PROP.(AmMin, v92:705)

See Also:

Links to other databases for Manganiandrosite-(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 Manganiandrosite-(Ce) Specimen Label here :

Manganiandrosite-(Ce)

(Mn++,Ca)(Ce,REE)AlMn+++Mn++(Si2O7)(SiO4)O(OH)
Dana No: 58.02.01c.09 Strunz No: 09.BG.05b
Locality:

Notes: