The calorific value of air-dried (15% m.c. wet basis) leucaena wood is about 3,900 kcal/kg (4,640 kcal/kg oven dried), similar to that of other non-resinous hardwoods.    From Wordnik.com.  [Chapter 10] Reference

The bed of the riffle, however, is constructed of some porous material, such as leather, non-resinous wood, or cement, which serves as the diaphragm upon which the mercury rests, and separates the fluid metal from the electrolyte beneath.    From Wordnik.com.  [Scientific American Supplement, No. 433, April 19, 1884] Reference

As noted, this should be made from a soft, non-resinous wood.    From Wordnik.com.  [Outside Magazine Gear Reviews] Reference

Second, carve a flat fireboard of soft, non-resinous wood that is about the same thickness as your drill's diameter.    From Wordnik.com.  [Outside Magazine Gear Reviews] Reference

1) Soft, non-resinous wood like yucca, cedar, or cottonwood must be used for the drill and fireboard.    From Wordnik.com.  [Outside Magazine Gear Reviews] Reference