The Stone Flower is an artifact that can be found in all three S.T.A.L.K.E.R. games.
"Born in the Springboard anomaly. This artifact is found in only a few areas of the Zone. The bits of metallic compounds create a beautiful light play. It is very calming to study this artifact at night by the fire." - Stone Flower artifact Shadow of Chernobyl item description. The Stone Flower increases bullet protection by 3%, and radiation by 5%. Just like the Jellyfish, the advantage is nearly insignificant and the artifact is best sold than used.