Silverwood Tree (Thaumcraft 3)

These are trees added by Thaumcraft. They sometimes spawn with pure nodes in the center, which makes them and their saplings incredibly useful. It's worth noting, however, that these nodes will break (and yield some ethereal essences) if you break the Silverwood log they reside in. Bear this in mind before you chop the tree haphazardly.

Thaumonomicon Entry
These rare and magical trees are a wondrous sight. Their leaves shimmer with magical energy and their pale, soft wood is valued for its purifying properties.

The trees magical nature is such that aura nodes often form within their hearts - this feature alone makes a silverwood sapling a prize beyond measure.