Choose three physical properties that might vary considerably between samples of the same mineral and explain why such variability might exist.

Overall, the physical properties of minerals provide a reliable means to identify common minerals. However, certain properties can exhibit a range of characteristics or values making them less useful for identification purposes. Choose three physical properties that might vary considerably between samples of the same mineral and explain why such variability might exist.

Considering the various processes involved in mechanical and chemical weathering, what are some of the factors that influence or control the weathering of earth materials?

Considering the various processes involved in mechanical and chemical weathering, what are some of the factors that influence or control the weathering of earth materials? Also, discuss which of these factors would be most important and why?