'What is this rock?’ is a commonly asked question here at the South Australian Museum.

To help answer your questions – and celebrate the diversity of the geological world – we’ll be running 'What's That? Wednesdays' on the first Wednesday of each month. Watch this space for upcoming sessions.

If you have a favourite rock or a fossil you'd like to be identified or verified, our expert geologist will be on hand to answer as many queries as possible and help explain these fascinating natural wonders.

For other identification enquiries, visit our Identification FAQs page.