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• Allanite abstract "Allanite (also called orthite) is a sorosilicate group of minerals within the broader epidote group that contain a significant amount of rare earth elements. The mineral occurs mainly in metamorphosed clay rich sediments and felsic igneous rocks. It has the general formula A2M3Si3O12[OH] where the A sites can contain large cations such as Ca2+, Sr2+, and rare earth elements and the M sites admit Al3+, Fe3+, Mn3+, Fe2+, or Mg2+ among others. However, a large amount of additional elements, including Th, U, Zr, P, Ba, Cr and others may be present in the mineral. The International Mineralogical Association lists three minerals in the allanite group, each recognized as a unique mineral: allanite-(Ce), allanite-(La) and allanite-(Y), depending on the dominant rare earth present, cerium, lanthanum or yttrium. Allanite contains up to 20% rare earth elements and is a valuable source of them. The inclusion of thorium and other radioactive elements in allanite results in some interesting phenomena. Allanite often has a pleochroic halo of radiation damage in the minerals immediately adjacent. Also highly radioactive grains of allanite often have their structure disrupted or are metamict. The age of allanite grains that have not been destroyed by radiation can be determined using different techniques.Allanite is usually black in color, but can be brown, brown-violet. It is often coated with a yellow-brown alteration product, likely limonite. It crystallizes in the monoclinic system and forms prismatic crystals. It has a Mohs hardness of 5.5–6 and a specific gravity of 3.5–4.2. It is also pyrognomic, meaning that it becomes incandescent at a relatively low temperature of about 95 °C.It was discovered in 1810 and named for the Scottish mineralogist, Thomas Allan (1777–1833). The type locality is Aluk Island, Greenland where it was first discovered by Karl Ludwig Giesecke.".
• Allanite thumbnail Allanite-(Ce)_-_Mary_Kathleen_Mine,_Mount_Isa,_Queensland,_Australia.jpg?width=300.
• Allanite wikiPageID "1895477".
• Allanite wikiPageLength "5208".
• Allanite wikiPageOutDegree "36".
• Allanite wikiPageRevisionID "679876902".
• Allanite wikiPageWikiLink Aluk_Island.
• Allanite wikiPageWikiLink Austrium.
• Allanite wikiPageWikiLink Category:Aluminium_minerals.
• Allanite wikiPageWikiLink Category:Calcium_minerals.
• Allanite wikiPageWikiLink Category:Epidote_group.
• Allanite wikiPageWikiLink Category:Iron_minerals.
• Allanite wikiPageWikiLink Category:Lanthanide_minerals.
• Allanite wikiPageWikiLink Category:Monoclinic_minerals.
• Allanite wikiPageWikiLink Category:Yttrium_minerals.
• Allanite wikiPageWikiLink Cerium.
• Allanite wikiPageWikiLink Epidote.
• Allanite wikiPageWikiLink Felsic.
• Allanite wikiPageWikiLink Greenland.
• Allanite wikiPageWikiLink Igneous_rock.
• Allanite wikiPageWikiLink International_Mineralogical_Association.
• Allanite wikiPageWikiLink Ion.
• Allanite wikiPageWikiLink Karl_Ludwig_Giesecke.
• Allanite wikiPageWikiLink Lanthanum.
• Allanite wikiPageWikiLink Limonite.
• Allanite wikiPageWikiLink Metamictization.
• Allanite wikiPageWikiLink Metamorphic_rock.
• Allanite wikiPageWikiLink Mohs_scale_of_mineral_hardness.
• Allanite wikiPageWikiLink Monoclinic_crystal_system.
• Allanite wikiPageWikiLink Pyrognomic.
• Allanite wikiPageWikiLink Radiohalo.
• Allanite wikiPageWikiLink Rare_earth_element.
• Allanite wikiPageWikiLink Scottish_people.
• Allanite wikiPageWikiLink Silicate_minerals.
• Allanite wikiPageWikiLink Specific_gravity.
• Allanite wikiPageWikiLink Thomas_Allan.
• Allanite wikiPageWikiLink Thorium.
• Allanite wikiPageWikiLink Yttrium.
• Allanite wikiPageWikiLink File:Allanite-Quartz-39466.jpg.
• Allanite wikiPageWikiLinkText "Allanite".
• Allanite wikiPageWikiLinkText "allanite".
• Allanite 2v "Measured: 40° to 80°".
• Allanite birefringence "δ = 0.018–0.031".
• Allanite caption "Allanite from the Mt. Isa – Cloncurry area, Queensland, Australia".
• Allanite category Silicate_minerals.
• Allanite cleavage "Imperfect to poor".
• Allanite color "Brown to black".
• Allanite diaphaneity "Translucent to opaque".
• Allanite formula "233".
• Allanite fracture "Conchoidal to uneven".
• Allanite gravity "3.5".
• Allanite habit "Crystals tabular, prismatic to acicular; granular, massive; commonly metamict".
• Allanite luster "Vitreous, resinous to submetallic".
• Allanite mohs "5.5".
• Allanite name "Allanite".
• Allanite opticalprop "Biaxial".
• Allanite other "May be radioactive".
• Allanite pleochroism "X = pale olive-green, reddish brown;".
• Allanite pleochroism "Y = dark brown, brownish yellow;".
• Allanite pleochroism "Z = dark reddish brown, greenish brown".
• Allanite refractive "nα = 1.715–1.791, nβ = 1.718–1.815, nγ = 1.733–1.822".
• Allanite streak "Grey".
• Allanite strunz "9".
• Allanite symmetry "Monoclinic 2/m".
• Allanite system Monoclinic_crystal_system.
• Allanite tenacity "Brittle".
• Allanite twinning "Polysynthetic, common on {100}".
• Allanite unitCell "a = 8.927 Å, b = 5.761 Å, c = 10.15 Å; β = 114.77°; Z = 2".
• Allanite wikiPageUsesTemplate Template:Infobox_mineral.
• Allanite wikiPageUsesTemplate Template:Reflist.
• Allanite subject Category:Aluminium_minerals.
• Allanite subject Category:Calcium_minerals.
• Allanite subject Category:Epidote_group.
• Allanite subject Category:Iron_minerals.
• Allanite subject Category:Lanthanide_minerals.
• Allanite subject Category:Monoclinic_minerals.
• Allanite subject Category:Yttrium_minerals.
• Allanite hypernym Group.
• Allanite type Band.
• Allanite type ChemicalSubstance.
• Allanite type Group.
• Allanite type Mineral.
• Allanite type Group.
• Allanite type Sorosilicate.
• Allanite type ChemicalObject.
• Allanite type Thing.
• Allanite type Q7946.
• Allanite comment "Allanite (also called orthite) is a sorosilicate group of minerals within the broader epidote group that contain a significant amount of rare earth elements. The mineral occurs mainly in metamorphosed clay rich sediments and felsic igneous rocks. It has the general formula A2M3Si3O12[OH] where the A sites can contain large cations such as Ca2+, Sr2+, and rare earth elements and the M sites admit Al3+, Fe3+, Mn3+, Fe2+, or Mg2+ among others.".
• Allanite label "Allanite".
• Allanite sameAs Q168227.
• Allanite sameAs Al·lanita.
• Allanite sameAs Allanit.
• Allanite sameAs Αλλανίτης.
• Allanite sameAs Allanita.
• Allanite sameAs Allaniit.
• Allanite sameAs آلانیت.
• Allanite sameAs אלניט.
• Allanite sameAs Ortit.
• Allanite sameAs Օրթիտ.
• Allanite sameAs Ортит.

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