Elaterite, also known as Aeonite[1], 'elastic bitumen' or 'mineral caoutchouc'.

Elaterite is a brown hydrocarbon varying somewhat in consistency, being sometimes soft, elastic and sticky, like India rubber, and occasionally hard and brittle. It is usually dark brown in color and slightly translucent. A substance of similar physical character is found in the Coorong district of South Australia, and is hence termed coorongite.[2] It is said to be carcinogenic.[citation needed]

Occurrence in nature

Strawberry, Utah, USA: Flows from the ground in a soft elastic form, also exists in the brittle form from various veins in the canyon walls.[citation needed]

Castleton in Derbyshire: Windy Knoll Cave. The lead mines of Odin.[citation needed]

References

Attribution
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Further reading