Androsite-(La) Mineral Data

Androsite-(La) Mineral Data +

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General Androsite-(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.

IMA Status:

Approved IMA 1994 (Dana # Added)

Locality:

Found in a manganese-rich silicate-carbonate rock, Petalon Mountain, Andros Island, Cyclades, Greece. Link to MinDat.org Location Data.

Name Origin:

Named after its discovery locality.

Synonym:

ICSD 81640

IMA1994-048

PDF 49-1826

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Androsite-(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

Physical Properties of Androsite-(La)

Color:

Reddish brown.

Density:

4.21

Diaphaniety:

Transparent

Luster:

Vitreous (Glassy)

Optical Properties of Androsite-(La)

Optical Data:

Biaxial (?), b=1.877

Calculated Properties of Androsite-(La)

Electron Density:

r_electron=3.98 gm/cc
note: r_{Androsite-(La)}=4.22 gm/cc.

Fermion Index

Fermion Index = 0.01187
Boson Index = 0.98813

Photoelectric:

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

Radioactivity:

GRapi = 18,922.41 (Gamma Ray American Petroleum Institute Units)

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

**Estimated Radioactivity from Androsite-(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 Androsite-(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)

Androsite-(La) Classification

Dana Class:

58.2.1a.13 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

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

(58.2.1a)Epidote group (Epidote subgroup)

58.2.1a.1 Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

58.2.1a.2 Allanite-(La)! Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.3 Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

58.2.1a.4 Clinozoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.5 Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 2₁/m 2/m

58.2.1a.6 Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 2₁/m 2/m

58.2.1a.7 Epidote Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.8 Hancockite (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.9 Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 2₁/m 2/m

58.2.1a.10 Mukhinite Ca2Al2V(SiO4)3(OH) P 2₁/m 2/m

58.2.1a.11 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.12 Strontiopiemontite (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.13 Androsite-(La) ! (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.14 Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 2₁/m 2/m

58.2.1a.15 Tweddillite! CaSr(Mn,Fe)2Al[Si3O12](OH) P 2₁/m 2/m

58.2.1a.16 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 2₁/a 2/m

58.2.1a.17 Niigataite! CaSrAl3(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.2.1a.18 Vastmanlandite-(Ce)! Ce3CaMg2Al2Si5O19(OH)2F P 2₁/m 2/m

58.2.1a.19 IMA2002-049! (Mn,Ca)(Ce,REE)AlMnMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.2.1a.20 Dissakisite-(La)! (Ca,Fe,Th)(REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F)withLa>Ce P 2₁/m 2/m

58.2.1a.22 IMA2004-015! (Mn,Ca)(REE)VAlMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

Strunz Class:

VIII/C.23-52 VIII - Silicates

VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups

VIII/C.23 - Epidote group

VIII/C.23-10 Clinozoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-20 Epidote Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-30 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-40 Strontiopiemontite (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-43 Niigataite! CaSrAl3(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

VIII/C.23-45 Tweddillite! CaSr(Mn,Fe)2Al[Si3O12](OH) P 2₁/m 2/m

VIII/C.23-50 Mukhinite Ca2Al2V(SiO4)3(OH) P 2₁/m 2/m

VIII/C.23-52 Androsite-(La) (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-55 Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 2₁/m 2/m

VIII/C.23-58 Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 2₁/m 2/m

VIII/C.23-60 Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

VIII/C.23-65 Allanite-(La)! Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-80 Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

VIII/C.23-85a Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 2₁/m 2/m

VIII/C.23-85 Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 2₁/m 2/m

VIII/C.23-87 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 2₁/a 2/m

VIII/C.23-90 Hancockite (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-100 Zoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) Pnmc 2/m 2/m 2/m

Other Androsite-(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 Androsite-(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 - WWW-MINCRYST

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Androsite-(La)

(Mn,Ca)(La,Ce,Ca,Nd)AlMn+++Mn++(SiO4)(Si2O7)O(OH)
Dana No: 58.2.1a.13 Strunz No: VIII/C.23-52
Locality:

Notes: