Leaves

The glass leaves uses the birch leaves pattern, but uses the glass style and color. Unlike normal leaves, glass leaves don't burn, or even decay when the logs of the tree have been mined out. Glass leaves can drop saplings, but they don't drop apples. Despite there being a bone tree, it does not generate with leaves.

However, the manchineel tree does generate with leaves, and they are a dark red color. Upon walking through them, they will hurt you.

Obtaining
It isn't known if you can get them with shears or not.

Breaking glass leaves can give you a glass sapling, or a Glass Shard. Breaking manchineel leaves can give you a manchineel sapling or an apple.

Natural generation
Glass leaves generate as a part of the glass tree that can only be found in the Glassland biome. Manchineel leaves generate as a part of the manchinell tree that can only be found in the Death Forest biome.

Usage
Could be used to make nice hedges.