Which of the following is NOT a part of mineral properties?

The property of gravity is not considered a standard mineral property in the same way that color, streak, and hardness are. Color refers to the visible hue of a mineral, which can vary significantly due to impurities or structural variations. Streak is the color of the powdered form of the mineral, obtained by rubbing it on a streak plate, and can provide more reliable identification than color alone, especially for minerals that may appear in different colors. Hardness measures the resistance of a mineral to scratching, often assessed using Mohs scale, which ranks minerals based on their relative hardness.

While gravity, or more accurately, specific gravity, can be used to help identify minerals, it is not one of the primary properties typically emphasized when discussing mineral characteristics in a foundational context. The standard mineral properties focus on color, streak, and hardness, making gravity less essential in introductory mineral classification.