👉 The term "opilio" is used in geology to refer to a mineral that forms when magma from an eruption cools and solidifies. This process is known as metamorphism, and it occurs in the Earth's crust where magma rises to the surface after a volcanic eruption. Ophiolites are found on the surface of rocks like granite, basalt, or gneiss and they are composed primarily of quartz, feldspar, and少量的少量的白云石。
