Tiberium is a dense "dynamic proton lattice" held together by exotic heavy particles. When Tiberium comes into contact with other matter, the heavy particles randomly collide with the nuclei of the target matter, smashing it to pieces (in the case of smaller nuclei) or incrementally knocking off protons or neutrons (in the case of heavier nuclei). Tiberium captures a fraction of the protons that are ejected during this collision process and incorporates them into its own structure, thus transmuting matter into more Tiberium. Whenever one of the heavy particles—a muon or tauon—collides with an atomic nucleus, fission occurs, which results in the production of alpha, beta, and gamma radiation as well as other forms of electromagnetic radiation (like infra-red). During the transmutation process, nuclei that Tiberium has come into contact with may be changed into nuclei with different (usually fewer) numbers of protons or neutrons.
— Mike Verdu, Living with Tiberium
What happens if you're exposed to Tiberium? Nothing good. If you come into direct contact with Tiberium, the green matter will start to fuse with your skin within about 20 seconds. You'll feel an intense burning sensation, similar to touching a hot pan or spilling acid on your skin. A full blown infection will manifest if you aren't treated immediately. Your flesh will begin to take on a glassy-greenish appearance as it begins to crystallize; eventually your internal organs will shut down as Tiberium extends rigid crystalline runners throughout your body. If you breathe in the crystal, then it will become embedded in your lungs. You'll lose the ability to process oxygen as your lung tissue crystallizes. Eventually you'll start coughing up blood and will hemorrhage to death.
— Mike Verdu, Living with Tiberium
Since real Tiberium is really dangerous, i settled with an artificial Tiberium cluster created form mountain crystal. Spoiler Alert: I really like the outcome. I will take some more time to complete the Built logs soon :-)
P.S.: Don't mistake Tiberium for Kryptonite! Kryptonite doesn't grow on planet earth... ;-)
Tiberium, known as Ichor to the Scrin, is a fictional substance that is central to the plot of much of the Command & Conquer series of real-time strategy computer games.