ˈslavə̇ˌkīt noun
( -s )
Etymology: Czech slavíkite, from František Slavik died 1957 Czech mineralogist + Czech -ite
: a mineral (Na, K) 2 Fe 10 (OH) 6 (SO 4 ) 13 .63H 2 O(?) consisting of a hydrous basic sodium ferric sulfate and occurring as small greenish yellow rhombohedral crystals on weathered shales from Bohemia