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https://www.youtube.com/@valls_geoconsultant?sub_confirmation=1 For more videos about geology, geochemistry, AI, and much more, please visit and subscribe for free here: Golden droplets- https://shorturl.at/fetV1 Geovoices- https://tinyurl.com/m23pp4pb News about geology- https://tinyurl.com/3979urhy Geo News Radio: https://shorturl.at/MwdSK Timestamps 0:00 - Introduction to Field Mineralogy 1:15 - The Geologist's Toolkit (Hardness & Lustre) 2:45 - Diamond Diagnostics: Adamantine Lustre 4:10 - Identifying Gold in Quartz Veins 6:00 - Sapphire vs. Quartz: The Density Test 8:30 - How to Identify Meteorites from Space 10:45 - Market Value Indicators & Rarity 12:00 - Summary Checklist for Field Work Ever found a shiny rock in a riverbed or a heavy stone on a hillside and wondered if it was a diamond, gold, or even a meteorite? In this video, we break down the exact diagnostic physical properties used by professional geologists to identify high-value materials in the field. Leveraging over 43 years of experience in geochemistry and mineralogy, I’ll show you how to move beyond "looks" and use empirical testing—such as the Mohs scale, specific gravity, and crystal habit—to distinguish real treasures from common look-alikes like quartz and pyrite. What you will learn in this guide: Diamond Identification: Why the "Fog Test" and thermal conductivity are your best friends. Identifying Raw Gold: How to distinguish native gold from "Fool's Gold" (Pyrite) using malleability and magnet tests. The Sapphire Secret: Why density (Specific Gravity) is the key to identifying Corundum. Meteorite Hunter Basics: How to spot a fusion crust and why "thumb-prints" (regmaglypts) matter. Synthetic Challengers: How to tell the difference between natural Diamonds and Moissanite. The bridge between Academy and Industry! P. Geo. Ricardo A Valls, M. Sc. and Geo Gadfly Valls Geoconsultant ORCID ID- https://orcid.org/0000-0002-5421-0914 Scopus Author ID: 7003369619/35335510700 ResearcherID: S-6604-2018 If you like this content, please "buy me a coffee" https://www.buymeacoffee.com/goldendroplets