mud - soil with mud, muck, or mire; The child mucked up his shirt while playing ball in the garden muck up, muck, mire begrime, bemire, colly, dirty, grime, soil - make soiled, filthy, or dirty; don't soil your clothes when you play outside!
Quartz is one of the most common minerals in the Earth's crust. It is made up of silicon dioxide (SiO2), otherwise known as silica. White sand is primarily made from quartz. Click here to find out more.
The most abundant mineral group, characterized by the presence of silica tetrahedra in their structures. Silicon-oxygen tetrahedron The silicate anion composed of one silicon atom and four oxygen atoms (SO42-) arranged as a tetrahedron. Single-chain structure An atomic arrangement in which each silicate tetrahedron shares one oxygen atom with another tetrahedron, forming a chain of tetrahedra.