10 help me with this i pay right away it earth science 6th grade

Assignment: Mineral Identification Investigation

Mineral Identification Data Table
Sample Number	Color	Cleavage or Fracture	Luster
25
26
27
13
7
23

Analysis

Sample 7:  

Sample 13:  

Sample 23:  

Sample 25:  

Sample 26:  

Sample 27:  

Questions

1.  Which mineral above would be the most difficult to scratch?

2.  Give two examples of minerals that have a property in common.

3.  Could you have identified any of the minerals after having described only a few, rather than all, of the properties you tested? If so, give an example.

4.  Why is it still a good idea to test more properties than might be necessary?