A recently introduced class of 5d superconformal field theories (SCFTs), dubbed 5d conformal matter (CM) in reference to the well known 6d CM theories, is constructed in M-theory on Calabi-Yau threefolds (CY3s) which can be viewed as intersecting ADE singularities. I will address the classification of these theories - based on the weight lattice of ADE algebras - which fall into three classes: Atoms, Molecules, and so called Hybrids. I will show how these three types are distinguished by their geometric construction. Further we will explore the brane constructions dual to the CY3s where possible, the quantum Higgs branch of the 5d CM theories, and the circle reduction to 4 dimensions.