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tritomite

A trigonal mineral, (Ce,La,Y,Th)5(Si,B,Al)3(O,OH,F)13(?) ; moderately radioactive; metamict; dark brown; in syenite with leucophanite, analcime, mosandrite, aegirine, and catapleiite. Formerly called spencite.

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  • ed.young
  • (Milwaukee, United States)

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