Elaterite

Elaterite (also known as Aeonite,[1] 'elastic bitumen' , 'mineral caoutchouc' or Wurtzilite) 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 at sites around the Coorong lagoon in South Australia, and is hence termed coorongite.

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Cave and elaterite, Windy Knoll quarry