这是什么？
The softest metal, liquid on a warm day, and the element that defines the second.
为何重要？
The international definition of a second is a count of caesium-133 transitions, so GPS, financial timestamps and the internet's clocks all trace back to this element.
该材料的深度文字内容尚未发布。以下所有内容均直接提取自原始数据集，内容完整。
正确读取数据。
Production is not published; supply comes from very few pollucite deposits.
Caesium formate drilling fluid, and metal for atomic clocks.
储量持有方
"储量"是一个严格的术语。它是指已知矿床中，按当前价格和当前技术，在经济上可行的可采部分——而非地下所有存量。当价格上涨或新工艺出现时，储量增加；当价格下跌时，储量减少。
Australia, Canada, China, and Namibia were estimated to have reserves totaling less than 200,000 tons
Australia, Canada, China, and Namibia were estimated to have reserves totaling less than 200,000 tons tons
2025
USGS Mineral Commodity Summaries 2026 · 来源 ↗
国家/地区 储量 占全球份额
Other countries
<200,000 —
概览
符号 Cs
原子序数 55
密度 1.93 g/cm³
熔点 28.50 °C
大陆架 航空航天与国防材料
有据事实
Primary applications (USGS)
Atomic clocks for global positioning systems and research and development.
2026 edition · USGS Mineral Commodity Summaries 2026
U.S. net import reliance
100 % of apparent consumption
2025 (estimated) · USGS Mineral Commodity Summaries 2026
Leading U.S. import sources
China, Germany
2021-2024 · USGS Mineral Commodity Summaries 2026
美国，近年数据
USGS 为每种大宗商品发布详细的国家分类表。本页为摘录内容，每行保留原始来源的单位与年份。
计量单位 年份 数值
The United States was 100% net import reliant for its cesium needs 2025 100.0 1?gram ampoules of 99.8% (metal basis) cesium 2025 104.0 1?gram ampoules of 99.9% (metal basis) cesium 2025 132.0 25 grams of 98% (metal basis) cesium formate 2025 56.10 50 grams of 99.9% (metal basis) cesium acetate 2025 161.0 50 grams of 99.9% (metal basis) cesium bromide 2025 111.0 50 grams of 99.9% (metal basis) cesium carbonate 2025 146.4 50 grams of 99.9% (metal basis) cesium chloride 2025 166.0 50 grams of 99.9% (metal basis) cesium iodide 2025 185.8 cesium-plasma standard solution (10,000 micrograms per milliliter) , 100 milliliters 2025 155.0
USGS Mineral Commodity Summaries 2026
