beckelite
noun
beck·e·lite
ˈbe-kə-ˌlīt
plural -s
: a mineral Ca3(Ce,La,Y)4(SiZr)3O15 consisting of the cerium metals and calcium and occurring in wax-yellow isometric crystals (hardness 5, specific gravity 4.15)
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Merriam-Webster unabridged
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