It is a mixture of Alpine Ash, Messmate, and Mountain Ash.
Australian Oak (Victorian Ash or Tasmanian Oak) is a light colored and medium density hardwood, pale straw through to lighter browns, with excellent staining qualities. Used extensively for T&G flooring and paneling, and interior joinery. Victorian Ash when from Victoria or Tasmanian Oak when from Tasmania, this is not an Oak either, but a mixture of three very similar Eucalyptus species that are marketed together.
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