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Allanite

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, where the A sites can contain large cations such as Ca2+, Sr2+, and…

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2V angle
Measured: 40° to 80°
Birefringence
δ = 0.018–0.031
Category
Sorosilicates
Cleavage
Imperfect to poor
Color
Brown to black
Crystal class
Prismatic (2/m) (same H-M symbol)

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Allanite

Nodes28
Edges27
Triples27
Avg. degree1.93
Density0.071429
Components1

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Allanite

Top relations

2V angle · 1
Allanite → Measured: 40° to 80°
Birefringence · 1
Allanite → δ = 0.018–0.031
Category · 1
Allanite → Sorosilicates
Cleavage · 1
Allanite → Imperfect to poor
Color · 1
Allanite → Brown to black
Crystal class · 1
Allanite → Prismatic (2/m) (same H-M symbol)
Crystal habit · 1
Allanite → Crystals tabular, prismatic to acicular; granular, massive; commonly metamict
Crystal system · 1
Allanite → Monoclinic
Diaphaneity · 1
Allanite → Translucent to opaque
Dispersion · 1
Allanite → r v; strong

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Important terminology

elements also minerals rare-earth mineral often radioactive group ce monoclinic contain amount large others present radiation grains discovered metamict formula

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Allanite2V angleMeasured: 40° to 80°1.00infobox
AllaniteBirefringenceδ = 0.018–0.0311.00infobox
AllaniteCategorySorosilicates1.00infobox
AllaniteCleavageImperfect to poor1.00infobox
AllaniteColorBrown to black1.00infobox
AllaniteCrystal classPrismatic (2/m) (same H-M symbol)1.00infobox
AllaniteCrystal habitCrystals tabular, prismatic to acicular; granular, massive; commonly metamict1.00infobox
AllaniteCrystal systemMonoclinic1.00infobox
AllaniteDiaphaneityTranslucent to opaque1.00infobox
AllaniteDispersionr > v; strong1.00infobox
AllaniteFormula(Ce,Ca,Y,La)2(Al,Fe+3)3(SiO4)3(OH)1.00infobox
AllaniteFractureConchoidal to uneven1.00infobox
AllaniteIMA symbolAln1.00infobox
AllaniteLusterVitreous, resinous to submetallic1.00infobox
AllaniteMohs scale hardness5.5–61.00infobox
AllaniteOptical propertiesBiaxial (−)1.00infobox
AllaniteOther characteristicsRadioactive if uranium and/or thorium-rich1.00infobox
AllanitePleochroismX = pale olive-green, reddish brown; Y = dark brown, brownish yellow; Z = dark reddish brown, greenish brown1.00infobox
AllaniteRefractive indexnα = 1.715–1.791, nβ = 1.718–1.815, nγ = 1.733–1.8221.00infobox
AllaniteSpace groupP21/m1.00infobox
AllaniteSpecific gravity3.5–4.21.00infobox
AllaniteStreakGrey1.00infobox
AllaniteStrunz classification9.BG.05b1.00infobox
AllaniteTenacityBrittle1.00infobox
AllaniteTwinningPolysynthetic, common on {100}1.00infobox
AllaniteUnit cella = 8.927, b = 5.761 c = 10.15 [Å]; β = 114.77°; Z = 21.00infobox

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