👉 Hyalite is a mineral that occurs in many forms and colors, including black, brown, grayish-brown, white, and white-gray. It is often found in volcanic areas and can be found in various rock types such as quartz, feldspar, and olivine. The term "hyalites" refers to the appearance of this mineral in rocks or minerals that are formed from volcanic activity. It is a type of hydrate, which means it is composed of hydrated minerals