the infinity stones
''Before the universe was created, the Infinity Stones existed as a singular force. Four Cosmic Entities created the stones: Death, Eternity, Entropy, and Infinity. Each of the stones possesses unique capabilities that have been enhanced and altered by various alien civilizations through the millennia.
Only beings of immense power can wield the stones, such as when the Celestials used the Orb to pass judgement on entire planets. Lesser beings are usually unable to grasp the full power of the stones and are destroyed by them when direct contact is made, such as the illness of Jane Foster when exposed to the Aether, the disintegration into Yggdrasil of Johann Schmidt by the Tesseract and the incineration of Carina by the Orb. Only once in recorded history has the power of all six stones been harnessed. This was achieved by six cosmic beings, each with one stone, linking themselves together. The effects were short-lived as the energy of the stones disintegrated all six beings after a few short moments.
Despite being referred to as "stones," the Infinity Stones appear in different shapes and states of matter. For example, the Tessaract appears to be almost glass like and the Aether has a liquid form. The Power Stone within the Orb is still in it's original stone form. It is possible that they were changed from that state of matter by those who used it such as Malekith with the Aether''
-Quoted From Marvel Movies Wiki
Only beings of immense power can wield the stones, such as when the Celestials used the Orb to pass judgement on entire planets. Lesser beings are usually unable to grasp the full power of the stones and are destroyed by them when direct contact is made, such as the illness of Jane Foster when exposed to the Aether, the disintegration into Yggdrasil of Johann Schmidt by the Tesseract and the incineration of Carina by the Orb. Only once in recorded history has the power of all six stones been harnessed. This was achieved by six cosmic beings, each with one stone, linking themselves together. The effects were short-lived as the energy of the stones disintegrated all six beings after a few short moments.
Despite being referred to as "stones," the Infinity Stones appear in different shapes and states of matter. For example, the Tessaract appears to be almost glass like and the Aether has a liquid form. The Power Stone within the Orb is still in it's original stone form. It is possible that they were changed from that state of matter by those who used it such as Malekith with the Aether''
-Quoted From Marvel Movies Wiki