From Marissa Zappas:

Petrichor is the word for the smell after it rains, when sun, water and land exhale all together. Orris, the root of the iris flower, fuels this blend: cold dark soil. Petrichor embodies the sensation of nature in wild repose– fresh, yet classic, evocative yet familiar, modern yet ancient. 

Notes:
Cold Earth, Lemon, Immortelle, Orris, Vetiver, Ambergris, Sandalwood, Moss, Musk