preobrazhenskite
/ˌpriːəʊbrəˈʒɛnskʌɪt/Mineralogy
noun
A rare mineral of the orthorhombic crystal system consisting of a basic magnesium borate, Mg3B11O15(OH)9, and occurring as colourless, lemon-yellow, or dark grey nodules in salt deposits in Kazakhstan.
Origin
1950s; earliest use found in American Mineralogist. From Russian preobraženskit from the name of Pavel Ivanovič Preobraženskij, investigator of Russian salt deposits + -it.