Manganiandrosite-(La) Mineral Data

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General Manganiandrosite-(La) Information

Chemical Formula:

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

Composition:

Molecular Weight = 595.24 gm

Calcium 2.02 % Ca 2.83 % CaO

Lanthanum 11.67 % La 13.68 % La₂O₃

Cerium 4.71 % Ce 5.51 % Ce₂O₃

Manganese 25.38 % Mn 20.86 % MnO / 13.26 % Mn₂O₃

Aluminum 4.53 % Al 8.56 % Al₂O₃

Silicon 14.16 % Si 30.28 % SiO₂

Hydrogen 0.17 % H 1.51 % H₂O

Neodymium 2.42 % Nd 2.83 % Nd₂O₃

Oxygen 34.94 % O

______ ______

100.00 % 99.33 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.75Ca_0.3La_0.5Ce_0.2Nd_0.1AlMn³⁺Mn²⁺(SiO₄)(Si₂O₇)O(OH)

Environment:

Forms a series with piemontite. Found in a manganese-rich silicate-carbonate rock.

IMA Status:

Approved IMA 1994 (Dana # Added)

Locality:

Petalon Mountain, Andros Island, Cyclades, Greece. Link to MinDat.org Location Data.

Name Origin:

Named after its discovery locality.

Synonym:

Androsite

Androsite-(La) - Renamed to Manganiandrosite-(La) - Recommended nomenclature of epidote-group minerals, Eur. J. Mineral. 2006, 18, 551-567.

IMA1994-048

Manganiandrosite-(La) Image

Images:

Manganiandrosite-(La)

Comments: Orange glassy crystalline manganiandrosite-(La).
Location: Mt. Petalon, Andros Island, Cyclades, Greece. Scale: Thumbnail.
© Tom Loomis / Dakota Matrix

Manganiandrosite-(La) Crystallography

Axial Ratios:

a:b:c =1.559:1:1.767

Cell Dimensions:

a = 8.896, b = 5.706, c = 10.083, Z = 2; beta = 113.88° V = 468.00 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): 2.895(1), 2.616(0.53), 3.506(0.41),

Crystal Structure:

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Bonazzi P , Menchetti S , Reinecke T , American Mineralogist , 81 (1996) p.735-742, Solid solution between piemontite and androsite-(La), a new mineral of the, epidote group from Andros Island, Greece, Sample: AND-517, Note: Mineral name changed from androsite-(La)

Physical Properties of Manganiandrosite-(La)

Color:

Reddish brown.

Density:

4.21

Diaphaneity:

Transparent

Luster:

Vitreous (Glassy)

Optical Properties of Manganiandrosite-(La)

Gladstone-Dale:

CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2078,KPDmeas= 0.2083,KC= 0.2049
Ncalc = 1.86

Optical Data:

Biaxial (?), b=1.877

Calculated Properties of Manganiandrosite-(La)

Electron Density:

Bulk Density (Electron Density)=3.98 gm/cc
note: Specific Gravity of Manganiandrosite-(La) =4.22 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Manganiandrosite-(La)}= 97.27 barns/electron
U=PE_{Manganiandrosite-(La)} x r_electron= 387.34 barns/cc.

Radioactivity:

GRapi = 18,922.41 (Gamma Ray American Petroleum Institute Units)
Concentration of Manganiandrosite-(La) per GRapi unit = 52.85 (PPM)

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

**Estimated Radioactivity from Manganiandrosite-(La)** - 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	421,099	1.14E-05	18,922.41	6.22
100 gm / 3.56 cm	42,110	1.14E-06	1,892.24	0.62
10 gm / 1.65 cm	4,211	1.14E-07	189.22	0.06
1 gm / 7.68 mm	421	1.14E-08	18.92	0.01
0.1 gm / 3.56 mm	42	1.14E-09	1.89	0.00
0.01 gm / 1.65 mm	4	1.14E-10	0.19	0.00
0.001 gm / 0.77 mm	0	1.14E-11	0.02	0.00

Weight of pure Manganiandrosite-(La) 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 ( 0.94 % Th) From Sum REE Elements (18.80 % REE)

Manganiandrosite-(La) Classification

Dana Class:

58.02.01c.06 (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-(La) Information

References:

NAME( AmMin, Vol 81) PHYS. PROP.(Am.Min.,Vol.81,p735-742,1996) OPTIC PROP.(Am.Min.,Vol.81,p735-742,1996)

See Also:

Links to other databases for Manganiandrosite-(La) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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Manganiandrosite-(La)

(Mn,Ca)(La,Ce,Ca,Nd)AlMn+++Mn++(SiO4)(Si2O7)O(OH)
Dana No: 58.02.01c.06 Strunz No: 09.BG.05b
Locality:

Notes: