What is special about the mineral composition the clay has that stopped the Cs+ from migrating to the aquifer?

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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The Hanford Site in Washington is a decommissioned nuclear production complex where tons of cesium waste was stored in tanks that were not properly lined. These tanks then corroded and the cesium waste leaked into the soils below toward the aquifer. However, the radioactive Cs+ stopped migrating toward the aquifer after a while because of the clay mineral composition of the soil in the subsurface. 

What is special about the mineral composition the clay has that stopped the Cs+ from migrating to the aquifer?

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