Final answer:
Multiple properties are used to identify an unknown mineral because each property provides different information about the mineral's characteristics. By combining multiple properties, geologists can make a more complete and objective identification.
Step-by-step explanation:
More than one property is often used to identify an unknown mineral because each property provides different information about the characteristics of the mineral. This helps to create a more complete picture of the mineral's identity. For example, the color of a mineral can vary, so using only color as a distinguishing factor would not be reliable. However, when combined with other properties like hardness, density, and crystal structure, a more accurate identification can be made.
By examining multiple properties, geologists can narrow down the possibilities and make a more confident identification. Two minerals may have the same color, but one may be significantly harder than the other. By considering these additional properties, the geologist can differentiate between the two minerals. It's like solving a puzzle, where each piece of information helps to complete the picture.
Additionally, using multiple properties provides a more objective approach to mineral identification. By considering a variety of physical properties, geologists can avoid making assumptions based on a single characteristic.