Gems of lightning and shadows. Rainbow fossils. Underground tunnel homes. Mysterious sedimentary origins. Aboriginal dreamtime stories. Armored snails. Questionable song lyrics. It’s opals, folks. And world expert geophysicist and University of Sydney professor Dr. Patrice Rey is here to talk about why he left France to explore the geological mysteries of the Outback. Should you get an opal engagement ring? Can they get wet? What’s the difference between an Australian and Ethiopian opal? What was one doing in a Kenyan cave 3000 years ago? What’s a Kyoto Opal vs. opalite? And why was your great grandma named Opal?

(Cultural warning to Aboriginal and Torres Strait Islander listeners: this episode mentions names and stories of people who have passed.)

Visit Dr. Rey’s website and follow him on Google Scholar

A donation went to the GO Foundation

More episode sources and links

Other episodes you may enjoy: Geology (ROCKS), Areology (MARS), Speleology (CAVES), Indigenous Pedology (SOIL SCIENCE), FIELD TRIP: I Go France and Learn Weird France Stuff, Gemology (GEMS & MINERALS), Volcanology (VOLCANOES), Biomineralogy (SHELLS)

400+ Ologies episodes sorted by topic

Smologies (short, classroom-safe) episodes

Sponsors of Ologies

Transcripts and bleeped episodes

Become a patron of Ologies for as little as a buck a month

OlogiesMerch.com has hats, shirts, hoodies, totes!

Follow Ologies on Instagram and Bluesky

Follow Alie Ward on Instagram and TikTok

Editing by Mercedes Maitland of Maitland Audio Productions and Jake Chaffee

Managing Director: Susan Hale

Scheduling Producer: Noel Dilworth

Transcripts by Aveline Malek

Website by Kelly R. Dwyer

Theme song by Nick Thorburn

Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.