Here's a breakdown:

* Radioactive decay is a process where an unstable atomic nucleus loses energy by emitting radiation, transforming into a different atom (or isotope). It's a natural phenomenon that happens spontaneously.

* Minerals are naturally occurring solid materials with a defined chemical composition and crystal structure.

* Subatomic particles are the particles that make up atoms (protons, neutrons, electrons).

In essence, some minerals contain radioactive isotopes within their structure. These isotopes undergo radioactive decay, emitting subatomic particles and transforming into other elements.

Here are some examples:

* Uranium is a radioactive element found in some minerals like pitchblende. It decays through a series of steps, ultimately ending up as lead.

* Potassium-40 is a radioactive isotope found in some minerals like feldspar. It decays into argon-40, which is used in radiometric dating.

Let me know if you'd like to learn more about radioactive decay or specific radioactive minerals!