Gyserite is a mineral that typically forms in the vicinity of hot springs and geysers, primarily composed of silica. It often appears as a white, amorphous, or fibrous substance and can create deposits around geothermal features. Gyserite is a significant indicator of geothermal activity and can contribute to the unique landscape found in areas like Yellowstone National Park. Its formation occurs through the precipitation of silica from hot, mineral-rich waters as they cool.