A semi-hard stone the entire dimension is made of.

Smoothed / polished version of liminus stone

Stalagmite / Stalactite made of exotic crystal ; which can be smelted into exotic crystal

A climbable rope studded with exotic crystal beads

An altar fueled with Opalium that raises your Attunement by 1 on use ; found fully fueled inside of Temples

Blocks of Opalium

Catalyst pearl amalgams use several of these blocks as part of their models.