[What's New] [Mineral Galleries] [About Us] [Contacts] [Login] At AA Mineral Specimens, we source quality Mineral Specimens, Fossils, Gemstones, Decorative Stones, Lapidary Material and Specimen Sets world-wide General Dissakisite-(La) Information(Ca,Fe++,Th, La)(La,REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F) with La > Ce |
Molecular Weight = 551.33 gm |
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Sodium 0.01 % Na 0.01 % Na2O |
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Strontium 0.16 % Sr 0.19 % SrO |
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Calcium 8.69 % Ca 12.15 % CaO |
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Lanthanum 7.94 % La 9.31 % La2O3 |
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Cerium 6.66 % Ce 7.80 % Ce2O3 |
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Praeseodymium 0.49 % Pr 0.57 % Pr2O3 |
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Samarium 0.05 % Sm 0.06 % Sm2O3 |
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Gadolinium 0.03 % Gd 0.03 % Gd2O3 |
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Erbium 0.03 % Er 0.03 % Er2O3 |
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Thorium 3.79 % Th 4.31 % ThO2 |
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Magnesium 2.74 % Mg 4.55 % MgO |
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Scandium 0.02 % Sc 0.03 % Sc2O3 |
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Uranium 0.13 % U 0.15 % UO2 |
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Titanium 0.26 % Ti 0.43 % TiO2 |
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Manganese 0.09 % Mn 0.12 % MnO |
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Aluminum 9.00 % Al 17.00 % Al2O3 |
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Vanadium 0.07 % V 0.12 % VO2 |
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Zinc 0.18 % Zn 0.22 % ZnO |
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Chromium 1.40 % Cr 1.83 % CrO |
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Gallium 0.01 % Ga 0.02 % Ga2O3 |
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Iron 4.08 %
Fe 3.13 % FeO / 2.17 % Fe2O3 |
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Silicon 15.13 % Si 32.37 % SiO2 |
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Nickel 0.11 % Ni 0.14 % NiO |
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Phosphorus 0.04 % P 0.10 % P2O5 |
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Hydrogen 0.18 % H 1.63 % H2O |
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Neodymium 0.99 % Nd 1.16 % Nd2O3 |
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Oxygen 37.70 % O |
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Fluorine 0.03 % F 0.03 % F |
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- %
F -0.01 % -O=F2 |
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______ ______ |
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100.00 % 99.73 % = TOTAL OXIDE |
Ca1.19Mn2+0.009Sr0.01Na0.002Th0.09U0.003La0.31Ce0.26Pr0.01Nd0.03Sm0.002Gd0.001Er0.001Al1.81
Mg0.62Fe2+0.24Fe3+0.15Cr0.14(OH) |
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 |
Approved IMA 2003 (Dana # Added) |
Found in a peridotite body from the Ulten zone (Austroalpine domain, Eastern Alps. Link to MinDat.org Location Data. |
Named for its A2 site cation content and relationship to Dissakisite-(Ce). |
IMA2003-007 |
| | Dissakisite-(La) Image
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Dissakisite-(La) Crystallographya:b:c =1.5655:1:1.7879 |
a = 8.959, b = 5.7226, c = 10.232, Z = 2; beta = 115.19° V = 474.70 Den(Calc)= 3.86 |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m |
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){001} Imperfect |
Black, Very dark brown. |
3.79 |
Translucent |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
Aggregates - Made of numerous individual crystals or clusters. |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
Inclusions - Generally found as inclusions in other minerals. |
6.5-7 - Pyrite-Quartz |
Vitreous (Glassy) |
pale greenish gray |
| Optical Properties of Dissakisite-(La)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 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)Bulk Density (Electron Density)=3.62 gm/cc |
note: Specific Gravity of Dissakisite-(La) =3.79 gm/cc. Fermion Index = 0.01 |
Boson Index = 0.99 PEDissakisite-(La) = 167.08 barns/electron |
U=PEDissakisite-(La) x relectron= 605.18 barns/cc. |
GRapi = 87,782.70 (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)
346.50 ± 86.62 grams of pure Dissakisite-(La) .
Weight of pure Dissakisite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.79 gm/cc.* | Dissakisite-(La) Classification58.02.01c.05 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups |
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(58.02)with cations in [6] and higher coordination; single and double groups (n=1,2) |
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(58.02.01c)Epidote group (Allanite subgroup) |
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09.BG.05b 09 - SILICATES (Germanates) |
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09.B - Sorosilicates |
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09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups; |
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| Other Dissakisite-(La) InformationNAME( AmMin, v90, p 1177) PHYS. PROP.(AmMin, v90, p 1177, v91, p104) OPTIC PROP.(AmMin, v90, p 1177) |
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 10 - Ruff.Info Search for Dissakisite-(La) using: Visit our Advertisers for Dissakisite-(La) : AA Mineral SpecimensB & L Fine Minerals Crystalarium.com Dan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Desert Winds Gems and Minerals Excalibur Minerals Exceptional Minerals Fabre Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club Wrights Rock Shop Translate Dissakisite-(La) Mineral Data : Ask about Dissakisite-(La) here : Print or Cut-and-Paste your Dissakisite-(La) Specimen Label here :
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