Hi, I have 40 years experience cutting precious and semi-precious stone and may be able to help a bit. Most of your bead is "country rock" while a small potion , the brightly colored area, is jasper, a type of opaque quartz.On the left of the bead in the first image you have what looks to be a vug, a small gas cavity that is now filled with what looks like small quartz crystals , quite standard. No agate at all. Agate is translucent to a degree and is often banded as it is deposited in layers by fluids , usually ground water saturated with silica leached from the host rock.