DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Allanite in its host rock. Allanite, also known as orthite, is a sorosilicate mineral. It is one of the most ubiquitous rare earth minerals known and an important ore for a number of rare earth elements, like cerium, lanthanum, yttrium and thorium. It is usually black with a high lustre. This specimen, from Snarum, Norway, measures 120 millimetres wide.
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