Which of the following is a quantitative property of minerals?
a. cleavage
b. hardness
c. luster
d. streak

B. Hardness

Explanation:

Qualitative properties are properties that are observed and can generally not be measured using a numerical value. Example : Cleavage,  Luster , streak

Quantitative properties are properties that are observed and can generally  be measured using a numerical value. Example: hardness

Hardness of minerals is the resistance of a material to deformation. It is measured using Moh's scale which ranges from 1 to 10 and thus have a numerical value.

Thus Hardness is a quantitative property of minerals.

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