Granitic Boulder in Outback of Queensland

June 26, 2004

Rock1

Provided and copyright by: Paul Michna, Earth Science Australia
Summary authors & editors: Paul Michna

The granitic boulder shown above near Charters Towers in the outback of Queensland, Australia seems to be coarser and more othoclase-rich toward its interior. The local climate here has a distinct wet and dry season, and it would appear that the coarser interior feldspar weathers more rapidly to clay than the more siliceous exterior. Expansion of the clay gives rise to very even sized plates on the rock's surface. This boulder is approximately 1 m in diameter.

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