Trees comprised entirely of crystal, they used to grow exclusively in Alidia, until one was introduced to Equestria

Their trunks and branches are usually variations of dark and light blue, respectively

No smell can be associated with this flora, as it does not have one

Now who the fuck would lick a giant crystal tree? ':l

The crystal gems that grow from this tree are strong magical enhancers

Geometrical teardrops

It's light can heal
It creates a harmonious environment in the area it has taken root (wild, dark and chaos magic are dulled)

Crystal Trees thrive out of sunlight, namely in caves or underground.