1911 Encyclopædia Britannica/Copalite

COPALITE, or Copaline, also termed “fossil resin” and “Highgate resin,” a naturally occurring organic substance found as irregular pieces of pale-yellow colour in the London clay at Highgate Hill. It has a resinous aromatic odour when freshly broken, volatilizes at a moderate temperature, and burns readily with a yellow, smoky flame, leaving scarcely any ash.