This picture shows the appearance of uranium hexafluoride. Square form for use in galleries and other special purposes (example from the Finnish Wikipedia).

This image is a work of a United States Department of Energy (or predecessor organization) employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain. Please note that national laboratories operate under varying licences and some are not free. Check the site policies of any national lab before crediting it with this tag. العربية ∙ Deutsch ∙ English ∙ français ∙ 日本語 ∙ македонски ∙ മലയാളം ∙ Nederlands ∙ русский ∙ українська ∙ Tiếng Việt ∙ 中文（简体） ∙ 中文（繁體） ∙ +/−

This picture came from Argonne National Laboratory [1]^{[dead link]}