There are numerous varieties of oak but it seems that they are all harder than eucalyptus. There is a test that measures what is called the Janka scale where a steel ball is pressed half way into a piece of whatever wood is being tested and the pressure is measured.
Brazilian Eucalyptus comes in at 1125 on the Janka scale.
Red Oak is a 1290. White Oak is a 1360, and Brazilian Oak is a 1650 on the Janka scale.
Since Brazilian woods seem to be a popular choice (and for the sake of comparison), Brazilian Tiger Mahogany comes in at a whopping 3840!
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