act turns first on the question of whether the claimant is an employee of the person or entity against whom the claim is brought there are a number of different statutory definitions for the nouns employer and employee in the act but no definition for the verb employ
Silicates are minerals that contain silicon atoms bonded to oxygen atoms. The basic building block for all silicate minerals is called a tetrahedron, where one silicon atom is bonded to 4 oxygen atoms (Figure 3.6).Silicate minerals also often contain other elements, such as calcium, iron, and magnesium.ilicates are minerals that contain silicon atoms bonded to oxygen atoms. The basic building block for all silicate minerals is called a tetrahedron, where one silicon atom is bonded to 4 oxygen atoms (Figure 3.6).
The vast majority of minerals in the Earth's rocks, from the crust down to the iron core, are chemically classed as silicates. The silicate minerals are all based upon a chemical unit called the silica tetrahedron.The silica tetrahedron consists of a silicon atom surrounded by four oxygen atoms.solated silica tetrahedra occur in many silicates such as olivine, where the tetrahedra are surrounded by iron and magnesium cations. Pairs of tetrahedra (SiO 7) occur in several silicates, the best known of which is probably hemimorphite.