Seems Clear to Me, page-14

https://minerals.usgs.gov/minerals/pubs/commodity/cesium/mcs-2017-cesiu.pdf

again to clarify how scarce and expensive cesium minerals are from the usgs...

​

Salient Statistics—United States: Consumption, import, and export data for cesium have not been available since the late 1980s. Because cesium metal is not traded in commercial quantities, a market price is unavailable. Only a few thousand kilograms of cesium are consumed in the United States every year. The United States is 100% import dependent for its cesium needs. In 2016, one company offered 1-gram ampoules of 99.8% (metal basis) cesium for $61.49 and 99.98% (metal basis) cesium for $76.41, an increase of 3.0% and 4.1%, respectively, from those in 2015. The prices that the company offered for 50 grams of 99.9% (metal basis) cesium acetate, cesium bromide, cesium carbonate, cesium chloride, and cesium nitrate were $114.74, $70.33, $99.50, $100.06, and $173.00, respectively. The price for a cesium-plasma standard solution (10,000 micrograms per milliliter) was $65.12 for 50 milliliters and $127.72 for 100 milliliters.
Recycling: Cesium formate brines are typically rented by oil and gas exploration clients. After completion of the well, the used cesium formate brine is returned and reprocessed for subsequent drilling operations. Cesium formate production from Canada was estimated to be 5,630 tons per year, including 3,890 tons of cesium from 17,300 tons of pollucite ore. The formate brines are recycled with a recovery rate of 85%, which can be retrieved for further use.
Import Sources (2012–15): Canada is the chief source of pollucite concentrate imported by the United States.