crystals, grown from sugar
No, crystals are chemical compounds that are not considered to be alive.
No the color of rock color candy does not change the speed in which it grows.
It is a solution.
It's easy to grow your own sugar crystals! Sugar crystals are also known as rock candy since the crystallized sucrose (table sugar) resembles rock crystals and because you can eat your finished product. You can grow beautiful clear sugar crystals with sugar and water or you can add food coloring to get colored crystals. It's simple, safe, and fun. Boiling water is required to dissolve the sugar, so adult supervision is recommended for this project.
there are materials inside of the crystal to help them grow
You mean, like the crystals you get when you put a seed crystal of sugar on the end of a string and put the string into a saturated sugar solution? (This is how to make rock candy. It's really cool. You should try it.) The longer you leave the crystals in the saturated solution, the larger they'll get.
Rock candy (pure sugar crystals).
some say it was around 200 C.E but actually that was when the crystals were discoverd but the candy was first made in the 18 century
It is a mixture.
Mixture
I really know actually! all i know is that i'm doing it for my science project! and it's made by seed crystals.