Use table to answer question.

Question

Use table to answer question.
MINERAL/ HARDNESS
Obsidian.   5
Halite.        2.5
Flourite.     4
CLEAVAGE/FRACTURE /LUSTER
Fracture.                            Vitreous
Cubic cleavage.                 Vitreous
Pctohedral.                         Vitreous

An unknown mineral specimen is not scratched by a penny and does not exhibit cleavage. This mineral is most likely to be:
a. obsidian
b. halite
c. fluorite

GPT 3.5 · Answer

Based on the information provided, the unknown mineral specimen is most likely to be obsidian since it is the only mineral listed that has a hardness of 5 and does not exhibit cleavage.