ERS120H5 Lecture Notes - Lecture 5: Crystal Habit, Hornblende, Viscosity
Document Summary
Lecture 5: compare the crystal structure of diamond and graphite and relate the structure to the mineral properties. Diamond: covalent bonds, isometric, shiny glassy, colourless. Graphite: covalent and van der waal bonds, hexagonal, metallic, silver-black: relate the properties of quartz to its mineral structure. Know its chemical composition, the type of bonding involved, and the approximate arrangements of atoms in its crystal structure. Earth: iron, silica and oxygen the core is full of iron and oxygen is naturally occurring. Earth"s crust: silica and oxygen almost every rock contains oxygen and silica is the building block for many rocks: describe the arrangement of silica tetrahedra in isolated tetrahedra, single chain, and double chain, sheet and network silicates. Know examples of minerals that correspond to each arrangement, and relate the arrangement to the physical properties of these minerals such as crystal habit and cleavage. Isolated: do not share oxygen atoms (olivine and garnet), no cleavage, orthorhombic and dodecahedron, stubby crystals.
