DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Gadolinite, a complex silicate mineral, chemical formula Y2FeBe2Si2O10. It is monoclinic with prismatic crystals in red to greenish black. Of industrial importance because it contains yttrium. From Evje in Iveland, Norway. Height 45mm.
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