Manacore
Manacore is a mineral that is almost 'pure' magic. A magical battery of sorts. In its raw form, Manacore is the most valuable. However, other forms of Manacore are created naturally by exposure to the elements and minerals around the deposit.
For example, if Manacore was found near a vein of silver, then that Manacore would have curative properties. While being beneficial to the healing arts, it would become useless in something meant to deal damage or poison.
Manacores can be found in the wild or dug up from the ground, much like other minerals. Manacores are crucial in forging magical items and gear.
Sagegrass
Sagegrass is unremarkable except for its distinct 'blue' color which occurs in all seasons. The plant itself would be harmless except it contains a large amount of magic for being a simple plant.
Sagegrass is considered a rare commodity. Beyond being blue in color, it grows in areas where magic seems to be prevalent, and only in clumps. The plant either concentrates magic or actually creates its own magical energy.
Typically, if you're near a Manacore, you're going to find bits of Sagegrass. It can be lethal if consumed in large amounts raw. Sagegrass is crucial in alchemy.