Notable locations in Williamsburg: Williamsburg Sport Complex (A), Sport Hill Country Club (B), Iowa County Ambulance Williamsburg (C), Williamsburg First Responders (D), Williamsburg Public Library (E), Williamsburg Police Department (F), Williamsburg Fire Department (G). Display/hide their locations on the map.
Types of Opal. Opal is a hydrated amorphous form of silica; its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid, unlike the other crystalline forms of silica, which are classed as minerals.
Conflict minerals are minerals mined in conditions where armed conflict and human rights abuses occur. The term is often used to refer to four minerals â tungsten, tantalum, tin and gold (also known as 3TG) â that are mined in the eastern region of the Democratic Republic of the Congo (DRC). These minerals are used in the production of various goods such as jewelry and virtually all electronic devices.