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In page Eucalyptus marginata:

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Jarrah wood is very similar to that of Karri, Eucalyptus diversicolor. Both trees are found in the southwest of Australia, and the two woods are frequently confused. They can be distinguished by cutting an unweathered splinter and burning it: karri burns completely to a white ash, whereas jarrah forms charcoal. This property of jarrah was critical to charcoal making and charcoal iron smelting operations at Wundowie from 1948 to 1981.[4] Most of the best jarrah has been logged in southwestern Australia.[citation needed]