The components are still being studied and are not determined with absolute certainty. Stacte is variously described as being the extract of the transparent portion of the myrrh resin which exudes spontaneously from the tree, or a balsam from a tree such as opobalsamum or a styrax. Onycha, which in Greek means “nail,” is variously described as being the operculum from a shell found in the Red Sea (which are said to resemble a fingernail), the exudation from the rock rose bush called labdanum (both petals and markings which are said to resemble a fingernail), Styrax benzoin, bdellium, or even cloves.