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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 0:00 – Hook: Why clay minerals matter in everyday life 0:24 – Clay minerals 101: structure and “superpowers” (surface area, absorption) ​1:15 – Kaolinite: ceramics, paper, cosmetics, and why it doesn’t swell ​2:05 – Smectite/bentonite: swelling, drilling muds, liners, cat litter, face masks ​3:05 – Illite: the workhorse clay in soils and construction materials ​3:45 – How we identify clays: XRD as a mineral “fingerprint” ​4:15 – Everyday uses: from porcelain and bricks to face masks and drywall ​5:15 – Clays as geothermometers: smectite–illite transition and Kubler index ​6:25 – Vectoring to ore: Oyu Tolgoi and advanced argillic alteration halos ​7:25 – “Shazam for rocks”: SWIR spectroscopy and spectral scalars ​8:05 – Clays in lithium and REE exploration (Thacker Pass, ion-adsorption clays) ​9:05 – Overpressure and drilling hazards in basins (smectite–illite dehydration) ​9:55 – Human story of clays and origin-of-life hypotheses ​10:35 – Field tricks: tooth, tongue, and “eating” tests for clays ​11:20 – Final message: tiny clays, billion‑dollar decisions, and call to subscribe In this video, we explore how clay minerals serve as sophisticated geochemical indicators for hydrothermal alteration mapping and mineral exploration vectoring toward porphyry copper, lithium, and rare earth element (REE) deposits. We dive deep into the geochemistry and structural geology of phyllosilicates, demonstrating how Short-Wave Infrared (SWIR) spectroscopy and machine learning are revolutionizing the identification of economic mineralization in complex terrains. Understanding the molecular architecture of these minerals is critical, as they are classified by their tetrahedral-octahedral sheet combinations into 1:1 layer types like kaolinite or 2:1 layer types such as smectite and illite. These clays act as precise mineralogical geothermometers and pH indicators, recording the physicochemical evolution of hydrothermal systems. 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 #valls_geoconsultant #ClayMineralogy #EconomicGeology #mineralexploration Some references Bozkaya, O., Bozkaya, G., Uysal, T., & Banks, D. A. (2016). Illite occurrences related to volcanic-hosted hydrothermal mineralization in the Biga Peninsula, NW Turkey: Implications for the age and origin of fluids. Ore Geology Reviews. Carvalho, J. d. A., Silva, A. M., Toledo, B., & Filho, C. A. d. M. (2025). Hydrothermal footprint of the Salobo Profundo Cu-Au orebody, Carajás mineral province, Brazil. Economic Geology. Corbett, G. J. (2018). 2.1 Alteration minerals. Corbett Geology. https://corbettgeology.com/wp-content/uploads/2018/02/chapter_2_interactive_single_page_18_feb_2018.pdf Earle, S. (2021). 10.5 Clay minerals. In Environmental geology. Pressbooks. https://environmental-geol.pressbooks.tru.ca/chapter/clay-minerals/ Fulignati, P. (2020). Clay minerals in hydrothermal systems. Minerals, 10(10), 919. https://doi.org/10.3390/min10100919 Kim, C. S., Kim, Y. H., Choi, S. G., Ko, K. B., & Han, K. S. (2017). Mineral identification and field application by short wave infrared (SWIR) spectroscopy. Economic and Environmental Geology, 50(1), 1–14. https://doi.org/10.9719/EEG.2017.50.1.1 Malvern Panalytical. (2021, October 27). In-field mineral identification: Easier than ever. https://www.malvernpanalytical.com/en/learn/knowledge-center/insights/mining-mineral-identification-nir Mat, M. (2018, April 21). Clay minerals: Formation, properties, uses, occurrence. Geology Science. https://geologyscience.com/minerals/clay-minerals/ Spectral Evolution. (2025). Identifying clays in mining exploration. https://spectralevolution.com/application-notes-exploration/identifying-clays-in-mining-exploration/ Thompson, A. J. B., Hauff, P. L., & Robitaille, A. J. (1999). Alteration mapping in exploration: Application of short-wave infrared (SWIR) spectroscopy. SEG Discovery, 39(1), 16–27. https://doi.org/10.5382/SEGnews.1999-39.fea Valls, R. (n.d.). Tactical identification and characterization of clay minerals in mineral exploration.