Rhyolite is an extrusive igneous rock that is primarily composed of silica (SiO₂), with a high percentage of quartz and feldspar. It is typically light-colored, ranging from gray, pink, to light brown, and can sometimes contain small amounts of minerals like mica and hornblende. Rhyolite forms from the cooling and solidification of lava that erupts at the Earth's surface. Its texture can vary from fine-grained to porphyritic, where larger crystals are embedded in a finer matrix. Rhyolite has a Mohs hardness of about 6, making it durable for use in stone carving and decorative pieces. Major sources include regions with volcanic activity, such as **the United States (Yellowstone), New Zealand, and parts of Mexico.