Organic: As it pertains to chemistry, this term refers to compounds that are derived from plants or animals. Petroleum is the liquid remains of ancient forests and consists of complex mixtures of hydrocarbons.

Definition used with Permission, from
The New Clay : Techniques and Approaches to Jewelry Making
by Nan Roche, Chris Roche (Photographer), Sue Roche (Illustrator), Seymour Bress (Editor)
Paperback - 144 pages Reprint edition (March 1992)
Flower Valley Press, Inc.; ISBN: 0962054348