Amethysts are found in geodes, which are the cavity of a rock in whose walls this rock appears embedded. The fact that it is a precious rock very susceptible to heat means that it can change color depending on the temperature. Thus, at 500 ° C it acquires an intense orange color, in which case it is known as burned amethyst. You have all the information in: «List of the most precious rocks and minerals on the planet«.
You have all the information in: "List of the most precious rocks and minerals on the planet".