RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Olivine mineral sample. Fractured olivine 'bomb', showing the internal structure of this mineral formation. Olivine is a magnesium iron silicate. In this case, a 'bomb' is a chunk of rock that has been ejected from a volcano during an eruption. The outside of the 'bomb' is weathered and dark grey. Olivine crystals are usually green as seen here, but can also be red.
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