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?&nbsp;(Cultural warning to Aboriginal and Torres Strait Islander listeners: this episode mentions names and stories of people who have passed.)Visit Dr. Rey’s <a href="https://geoscience-prey.sydney.edu.au/" rel="noopener noreferrer">website</a> and follow him on <a href="https://scholar.google.com.au/citations?user=7OFZoyAAAAAJ&hl=en" rel="noopener noreferrer">Google Scholar</a>&nbsp;A donation went to the <a href="https://www.gofoundation.org.au/" rel="noopener noreferrer">GO Foundation</a><a href="https://www.alieward.com/ologies/silificationgeology" rel="noopener noreferrer">More episode sources and links</a>Other episodes you may enjoy: <a href="https://www.alieward.com/ologies/geology" rel="noopener noreferrer">Geology (ROCKS)</a>, <a href="https://www.alieward.com/ologies/areology" rel="noopener noreferrer">Areology (MARS)</a>, <a href="https://www.alieward.com/ologies/speleology" rel="noopener noreferrer">Speleology (CAVES)</a>, <a href="https://www.alieward.com/ologies/indigenouspedology" rel="noopener noreferrer">Indigenous Pedology (SOIL SCIENCE)</a>, <a href="https://www.alieward.com/ologies/france" rel="noopener noreferrer">FIELD TRIP: I Go France and Learn Weird France Stuff</a>, <a href="https://www.alieward.com/ologies/gemology" rel="noopener noreferrer">Gemology (GEMS & MINERALS)</a>, <a href="https://www.alieward.com/ologies/volcanology" rel="noopener noreferrer">Volcanology (VOLCANOES)</a>, <a href="https://www.alieward.com/ologies/biomineralogy" rel="noopener noreferrer">Biomineralogy (SHELLS)</a>&nbsp;<a href="https://www.alieward.com/ologies-by-topic" rel="noopener noreferrer">400+ Ologies episodes sorted by topic</a><a href="https://pod.link/1746567248" rel="noopener noreferrer">Smologies (short, classroom-safe) episodes</a>&nbsp;<a href="https://alieward.com/ologies-sponsors" rel="noopener noreferrer">Sponsors of Ologies</a><a href="https://alieward.com/ologies-extras" rel="noopener noreferrer">Transcripts and bleeped episodes</a><a href="https://www.patreon.com/ologies" rel="noopener noreferrer">Become a patron of Ologies</a> for as little as a buck a month<a href="https://www.ologiesmerch.com/" rel="noopener noreferrer">OlogiesMerch.com</a> has hats, shirts, hoodies, totes!Follow Ologies on <a href="https://www.instagram.com/ologies" rel="noopener noreferrer">Instagram</a> and <a href="https://bsky.app/profile/ologies.bsky.social" rel="noopener noreferrer">Bluesky</a>Follow Alie Ward on <a href="https://www.instagram.com/alieward" rel="noopener noreferrer">Instagram</a> and <a href="https://www.tiktok.com/@alie_ologies" rel="noopener noreferrer">TikTok</a>Editing by Mercedes Maitland of <a href="http://maitlandaudio.com/" rel="noopener noreferrer">Maitland Audio Productions</a> and <a href="https://www.jecmusic.com/" rel="noopener noreferrer">Jake Chaffee</a>Managing Director: Susan HaleScheduling Producer: Noel DilworthTranscripts by Aveline MalekWebsite by <a href="https://www.kellyrdwyer.com/photo" rel="noopener noreferrer">Kelly R. Dwyer</a>Theme song by Nick Thorburn Hosted by Simplecast, an AdsWizz company. See <a href="https://pcm.adswizz.com">pcm.adswizz.com</a> for information about our collection and use of personal data for advertising.

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