Placing a mineral on the Mohs scale requires 
strength magnesium as a base transportation scratching it classified periodic table photographing it
A B C D E F G H
For ranking the hardness of minerals, the Mohs scale is generally used.
Scratching a mineral  allows one to determine the ranking on the Mohs scale
Placing a mineral on the Mohs scale requires  (A) strength (B) magnesium (C) as a base (D) transportation (E) scratching it (F) classified (G) periodic table (H) photographing it