Dissakisite-(La) Mineral Data (original) (raw)

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+0.009Sr0.01Na0.002Th0.09U0.003La0.31Ce0.26Pr0.01Nd0.03Sm0.002Gd0.001Er0.001Al1.81Mg0.62Fe2+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

Click Here for Larger Dissakisite-(La) Image in a New Browser Window Images:

Click Here for Larger Dissakisite-(La) Image 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

Click Here for Larger Dissakisite-(La) Image in a New Browser Window Images:

Click Here for Larger Dissakisite-(La) Image 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 - 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)(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

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor 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: