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Quartz is a hard, crystalline mineral composed of silica ( silicon dioxide ). The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2. Quartz is, therefore, classified structurally as a framework silicate mineral and ...
Berlin[ a] is the capital and largest city of Germany, both by area and by population. [ 11] Its more than 3.85 million inhabitants [ 12] make it the European Union 's most populous city, as measured by population within city limits. [ 13] The city is also one of the states of Germany, and is the third smallest state in the country in terms of ...
On January 6, 2021, the United States Capitol Building in Washington, D.C. was attacked by a mob [39] [40] [41] of supporters of then-U.S. president Donald Trump, two months after his defeat in the 2020 presidential election.