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Dissakisite-(La) Mineral Data

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General Dissakisite-(La) Information

Help on Chemical  Formula: Chemical Formula: (Ca,Fe++,Th, La)(La,REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F) with La > Ce
Help on Composition: Composition: Molecular Weight = 551.33 gm
   Sodium          0.01 %  Na    0.01 % Na2O
   Strontium       0.16 %  Sr    0.19 % SrO
   Calcium         8.69 %  Ca   12.15 % CaO
   Lanthanum       7.94 %  La    9.31 % La2O3
   Cerium          6.66 %  Ce    7.80 % Ce2O3
   Praeseodymium   0.49 %  Pr    0.57 % Pr2O3
   Samarium        0.05 %  Sm    0.06 % Sm2O3
   Gadolinium      0.03 %  Gd    0.03 % Gd2O3
   Erbium          0.03 %  Er    0.03 % Er2O3
   Thorium         3.79 %  Th    4.31 % ThO2
   Magnesium       2.74 %  Mg    4.55 % MgO
   Scandium        0.02 %  Sc    0.03 % Sc2O3
   Uranium         0.13 %  U     0.15 % UO2
   Titanium        0.26 %  Ti    0.43 % TiO2
   Manganese       0.09 %  Mn    0.12 % MnO
   Aluminum        9.00 %  Al   17.00 % Al2O3
   Vanadium        0.07 %  V     0.12 % VO2
   Zinc            0.18 %  Zn    0.22 % ZnO
   Chromium        1.40 %  Cr    1.83 % CrO
   Gallium         0.01 %  Ga    0.02 % Ga2O3
   Iron            4.08 %   Fe    3.13 % FeO /  2.17 % Fe2O3
   Silicon        15.13 %  Si   32.37 % SiO2
   Nickel          0.11 %  Ni    0.14 % NiO
   Phosphorus      0.04 %  P     0.10 % P2O5
   Hydrogen        0.18 %  H     1.63 % H2O
   Neodymium       0.99 %  Nd    1.16 % Nd2O3
   Oxygen         37.70 %  O
   Fluorine        0.03 %  F     0.03 % F
                    -   %   F    -0.01 % -O=F2    
                 ______        ______ 
                 100.00 %       99.73 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.19Mn2+0.009Sr0.01Na0.002Th0.09U0.003La0.31Ce0.26Pr0.01Nd0.03Sm0.002Gd0.001Er0.001Al1.81 Mg0.62Fe2+0.24Fe3+0.15Cr0.14(OH)
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. Mg-analogue of allanite-(L
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Found in a peridotite body from the Ulten zone (Austroalpine domain, Eastern Alps. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its A2 site cation content and relationship to Dissakisite-(Ce).
Help on Synonym: Synonym: IMA2003-007
 

Dissakisite-(La) Image

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  Dissakisite-(La)

Comments: B&W macrophotograph of dissakisite-(La) from the as matrix constituents and Cr-rich spinel in a peridotite matrix. AmMin, v90 p 1178.
Location: Ulten zone, Eastern Alps, Italy. Scale: See Image.
© American Mineralogist

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  Dissakisite-(La)

Comments: B&W thin section image showing radial cracks from dissakisite-(La) (dik) propagating into the surrounding olivine (ol). AmMin, v90 p 1178.
Location: Ulten zone, Eastern Alps, Italy. Scale: See image.
© American Mineralogist

Dissakisite-(La) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5655:1:1.7879
Help on Cell Dimensions: Cell Dimensions: a = 8.959, b = 5.7226, c = 10.232, Z = 2; beta = 115.19° V = 474.70 Den(Calc)= 3.86
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.926(1)(113 ), 2.86(0.53)(020 ), 2.553(0.51)(202 ),3.526(0.49)(211 ), 2.699(0.44)(120 ),
 

Physical Properties of Dissakisite-(La)

Help on Cleavage: Cleavage: {001} Imperfect
Help on Color: Color: Black, Very dark brown.
Help on Density: Density: 3.79
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 6.5-7 - Pyrite-Quartz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: pale greenish gray
 

Optical Properties of Dissakisite-(La)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1928,KPDmeas= 0.1963,KC= 0.1976
Ncalc = 1.75 - 1.76
Help on Optical Data: Optical Data: Biaxial (+), a=1.7395, b=1.7434, g=1.7495, bire=0.0100, 2V(Calc)=78, 2V(Meas)=77. Dispersion r < v medium.
 

Calculated Properties of Dissakisite-(La)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.62 gm/cc
note: Specific Gravity of Dissakisite-(La) =3.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEDissakisite-(La) = 167.08 barns/electron
U=PEDissakisite-(La) x relectron= 605.18 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 87,782.70 (Gamma Ray American Petroleum Institute Units)
Concentration of Dissakisite-(La) per GRapi unit = 11.39 (PPM)

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) 346.50 ± 86.62 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 / 7.96 cm 1,928,865 5.21E-05 87,782.70 28.86
100 gm / 3.69 cm 192,887 5.21E-06 8,778.27 2.89
10 gm / 1.71 cm 19,289 5.21E-07 877.83 0.29
1 gm / 7.96 mm 1,929 5.21E-08 87.78 0.03
0.1 gm / 3.69 mm 193 5.21E-09 8.78 0.00
0.01 gm / 1.71 mm 19 5.21E-10 0.88 0.00
0.001 gm / 0.80 mm 2 5.21E-11 0.09 0.00

Weight of pure Dissakisite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.79 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: 58.02.01c.05 (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
Help on  Strunz Class: 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 Dissakisite-(La) Information

Help on References: References: NAME( AmMin, v90, p 1177) PHYS. PROP.(AmMin, v90, p 1177, v91, p104) OPTIC PROP.(AmMin, v90, p 1177)
Help on See Also: See Also: Links to other databases for Dissakisite-(La) :
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 Dissakisite-(La) Specimen Label here :

Dissakisite-(La)

(Ca,Fe++,Th, La)(La,REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F) with La > Ce
Dana No: 58.02.01c.05 Strunz No: 09.BG.05b
Locality:

 

Notes:

 

 
   
 


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