They were reportedly the largest silica sinter deposits on earth. Examples of siliceous sinter are geyserite and fiorite. The colourful deposits are in sharp contrast to the grey-white silica sinter surrounding Champagne Pool. Calcareous speleothems may be regarded as a form of calcareous sinter. Volcanic rock fragments such as plagioclase and quartz are found within cavities of the sinter. El Tatio is a geothermal field with many geysers, hot springs, and associated sinter deposits. Alternatively, iron or bronze sinter friction layers can be used. Microorganisms and material like pollen is found integrated within the sinter deposits. Fresnel lenses can be used to sinter sand, allowing 3D printing in glass. The purpose of sinter are to be used converting iron into steel. Instead it forms a sinter cone on the pedestal. The rate at which sinter is deposited has been estimated at . Wawa suffered a population decline after the closures of Helen Mine and the sinter plant. Cahnite has also been identified in sinter deposits. Material is put on a sinter machine in two layers.