hardness, luster, and color are?
a. mineral properties
b. mineral characteristics

pretty sure the answer is B..

Explanation:

The properties of matter include any traits that can be measured, such as an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more

Most minerals can be characterized and classified by their unique physical properties: hardness, luster, color, streak, specific gravity, cleavage, fracture, and tenacity.

Hardness and color fit into both categories, but I think luster is only in the second one..

hope this helps!

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex