DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Jasper mineral rock deposits. Jasper is a variety of chalcedony (also known as chert), an impure variety of silica (SiO2). It is opaque and occurs in many different colours. This deposit is near Marble Bar, a small village in the middle of the West Australian desert. The deposit, in an exposed rock formation, includes parallel red and white bands. These formed when a finely bedded sedimentary rock was converted into chalcedony by metamorphic geological processes involving high pressures and temperatures at great depth underground. This is a large mass of jasper relative to other deposits.
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