Dissakisite-(La) Mineral Data

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General Dissakisite-(La) Information
Help on Chemical Formula: Chemical Formula: (Ca,Fe,Th)(REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F) with La > Ce
Help on Composition: Composition: Molecular Weight = 582.97 gm
   Calcium           5.84 %  Ca    8.18 % CaO
   La,Ce,Pr,Nd,Sm,  18.53 %  RE   21.61 % REE2O3
   Thorium           3.98 %  Th    4.53 % ThO2
   Magnesium         2.50 %  Mg    4.15 % MgO
   Titanium          1.64 %  Ti    2.74 % TiO2
   Aluminum          6.02 %  Al   11.37 % Al2O3
   Chromium          5.35 %  Cr    7.82 % Cr2O3
   Iron              5.75 %  Fe    8.22 % Fe2O3
   Silicon          14.45 %  Si   30.92 % SiO2
   Hydrogen          0.13 %  H     1.16 % H2O
   Oxygen           34.99 %  O
   Fluorine          0.81 %  F     0.81 % F
                      -   %   F    -0.34 % -O=F2
                   ______        ______ 
                   100.00 %      101.17 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.6Fe3+0.3Th0.1REE0.75Ca0.25Al1.2Cr0.6Ti0.2Mg0.6Fe3+0.3Al0.1Si3O12(OH)0.75F0.25
Help on Environment: Environment: Occurs in peridotite incorporated in a Variscan subducted crustal slab which crystallised under eclogite-facies conditions or during the early stage of retrogression in the amphibol ite facies. Epidote group
Help on IMA Status: IMA Status: Proposed IMA 2003 (Dana # Added)
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Commission on New Minerals and Mineral Names (CNMMN)
Help on Synonym: Synonym: IMA2003-007
 

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Dissakisite-(La) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.5649:1:1.7873
Help on Cell Dimensions: Cell Dimensions: a = 8.9616, b = 5.7265, c = 10.2353, Z = 2; beta = 115.193° V = 475.30 Den(Calc)= 4.07
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.926(1), 2.86(0.53), 2.553(0.51),3.53(0.49), 2.699(0.44), 2.714(0.41), 2.623(0.38),
 

Physical Properties of Dissakisite-(La)

Help on Color: Color: Black, Very dark brown.
Help on Diaphaniety: Diaphaniety: Opaque
Help on Luster: Luster: Vitreous (Glassy)
 

Optical Properties of Dissakisite-(La)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.14 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1828,KC= 0.2127
 

Calculated Properties of Dissakisite-(La)

Help on Electron Density: Electron Density:

relectron=3.87 gm/cc
note: rDissakisite-(La) =4.07 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.05239
Boson Index = 0.94761
Help on Photoelectric: Photoelectric:

PEDissakisite-(La) = 203.18 barns/electron
U=PEDissakisite-(La) x relectron= 786.58 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 80,834.30 (Gamma Ray American Petroleum Institute Units)

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

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 376.28 ± 94.07 grams of pure Dissakisite-(La) .

Estimated Radioactivity from Dissakisite-(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 / 7.77 cm 1,784,664 4.82E-05 80,834.30 26.58
100 gm / 3.61 cm 178,466 4.82E-06 8,083.43 2.66
10 gm / 1.67 cm 17,847 4.82E-07 808.34 0.27
1 gm / 7.77 mm 1,785 4.82E-08 80.83 0.03
0.1 gm / 3.61 mm 178 4.82E-09 8.08 0.00
0.01 gm / 1.67 mm 18 4.82E-10 0.81 0.00
0.001 gm / 0.78 mm 2 4.82E-11 0.08 0.00

Weight of pure Dissakisite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.07 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
 

Dissakisite-(La) Classification
Help on Dana Class: Dana Class: 58.2.1a.20 (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
Help on Strunz Class: Strunz Class: VIII/CX.00-00 VIII - Silicates
  VIII/CX - Unclassified Strunz Sorosilicates
  VIII/CX.00 - Epidote group
 

Other Dissakisite-(La) Information
Help on See Also: See Also: Links to other databases for Dissakisite-(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

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Dissakisite-(La)

(Ca,Fe,Th)(REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F) with La > Ce
Dana No: 58.2.1a.20 Strunz No: VIII/CX.00-00
Locality:

 

Notes:

 
 
   
 
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