Full Idea
Leibniz was not an essentialist.
Gist of Idea
Leibniz was not an essentialist
Source
report of Gottfried Leibniz (works [1690]) by David Wiggins - Sameness and Substance Renewed 4.2 n4
Book Reference
Wiggins,David: 'Sameness and Substance Renewed' [CUP 2001], p.109
A Reaction
Assuming this is right, it is rather helpful, because you can read mountains of Leibniz without ever being quite sure. Mackie says he IS an extreme essentialist, treating all properties as essential. Wiggins makes more sense there.
Related Idea
Idea 11878 Leibniz's view (that all properties are essential) is extreme essentialism, not its denial [Leibniz, by Mackie,P]