Full Idea
For Kripke an object's essence simply consists of its necessary properties. ...His essential properties of individual objects follow from our intuitions about their identity. ...They are of three sorts: of origin, of sortals, and of material.
Gist of Idea
An essence is the necessary properties, derived from an intuitive identity, in origin, type and material
Source
report of Saul A. Kripke (Naming and Necessity lectures [1970]) by Charlotte Witt - Substance and Essence in Aristotle 6 n3
Book Reference
Witt,Charlotte: 'Substance and Essence in Aristotle' [Cornell 1994], p.181
A Reaction
This is because Kripke is only interested in identity, whereas Aristotle is interested in explanation. The sorts are efficient, formal, material. Big Q: could Aristotle's account of essence do all the work that is required of essences by Kripke?