Presentation on theme: "Chapter 3 Minerals. Mineral Naturally occurring Inorganic Solid Definite structure – crystalline – solid in which the atoms are arranged in a repeating."— Presentation transcript:
Formation of minerals 1. Cooling magma – cooling slows particles which cause them to move closer together and form compounds. - molecules arrange themselves into repeating patterns - type and amt of minerals depend on the composition of the magma - many different minerals form - quicker magma cools, faster crystals form, smaller crystal size/or no apparent crystal
2. Crystal from solution – minerals dissolved in liquids - when liquid evaporates the mineral is left behind 3. Crystals from supersaturated solution – molecules of the mineral fall out of the solution.
98% of the earth’s crust is made of only 8 elements Silicates – most common rock forming elements - minerals that contain O and Si
Mineral Identification Physical properties – observable properties Hardness – how easily mineral can be scratched Talc – soft mineral -scratch with fingernail - talcum powder Diamond – hardest of all minerals - only another diamond can scratch it - used in special cutting tools