Allanite
Definition
A mineral belonging to the epidote group, black, brown, or gray in color, with a resinous or submetallic luster, containing significant percentages of rare-earth elements (cerium, lanthanum, neodymium, yttrium), alongside traces of thorium or uranium, which give it a weakly radioactive nature. It crystallizes in the monoclinic system and occurs as an accessory mineral in igneous (granites, pegmatites) and metamorphic rocks.
Bilingual Equivalents
- Allanite
- Orthite
Grammatical & Source Details
| Inflection Type | Common singular or plural noun stable across standard syntactic structures. |
| Formation | Named in honor of the Scottish mineralogist Thomas Allan, who first identified and described the mineral species in Greenland. |
| Spelling / Pronunciation | [ˈælənaɪt] |
| Source | Encyclopedia of Mineralogy and International Mineralogical Association Index |
Contextual Usage Examples
RO: Geologul a identificat incluziuni microscopice de allanit în secțiunea subțire de granit analizată la microscop.
EN: The geologist identified microscopic inclusions of allanite in the thin section of granite analyzed under the microscope.
RO: Deoarece conține toriu, acest eșantion de allanit prezintă un metamictism avansat al structurii cristaline.
EN: Because it contains thorium, this allanite specimen exhibits advanced metamictization of its crystalline structure.
RO: Allanitul este studiat intens ca sursă secundară pentru extragerea ceriului și a lantanului în industrie.
EN: Allanite is intensively studied as a secondary source for the industrial extraction of cerium and lanthanum.
Idioms & Phrases
Cristal de allanit / Allanite crystal
RO: Formă prismatică sau tabulară de dezvoltare a mineralului, adesea neagră și opacă, cu fețe slab striate.
EN: Prismatic or tabular growth form of the mineral, often black and opaque, with faintly striated faces.
Allanit metamictic / Metamict allanite
RO: Stare a mineralului în care rețeaua cristalină internă a fost distrusă din cauza auto-radiațiilor emise în timp.
EN: A state of the mineral where the internal crystal lattice has been destroyed due to self-radiation emitted over time.
Grupul epidot-allanit / Epidote-allanite group
RO: Serie de minerale silicatice izomorfe ce împart proprietăți structurale similare, dar diferă prin conținutul de pământuri rare.
EN: A series of isomorphic silicate minerals sharing similar structural properties but differing in their rare-earth content.
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