From Wikipedia, the free encyclopedia. The chemical compound silicon dioxide, also known as silica, is the oxide of silicon, chemical formula SiO2.It is found in nature in several forms, including quartz and opal. In fact, silica has 17 crystalline forms.he chemical compound silicon dioxide, also known as silica, is the oxide of silicon, chemical formula SiO2.
Windsor is home to 217,188 people, according to the 2016 census. Windsor's population has grown by three per cent in the past five years, but the city still fell behind the national growth rate, according to data collected during the 2016 census.
Sponsored Topics. Windsor is a borough in York County, Pennsylvania, United States. The population was 1,331 at the 2000 census. Windsor is located at 39Â°54â²56â³N 76Â°34â²59â³W / 39.91556Â°N 76.58306Â°W / 39.91556; -76.58306 (39.915577, -76.582973). According to the United States Census Bureau, the borough has a total area of 0.5 square miles (1.3 kmÂ²), all of it land.