Answer:
1. C- Pyrite has a nickname that has become famous - "Fool's Gold." The mineral's gold color, metallic luster, and high specific gravity often cause it to be mistaken for gold by inexperienced prospectors.
2. B- If a mineral's structure is equally strong in all directions it will not have any cleavage planes. Instead it will break unevenly, or fracture. There are different types of fracture. In the example below, quartz has a conchoidal (shell-shaped) fracture.
3. A- The perfect cleavage into thin elastic sheets is probably the most widely recognized characteristic of the micas. The luster of the micas is usually described as splendent, but some cleavage faces appear pearly. Mohs hardness of the micas is approximately 21/2 on cleavage flakes and 4 across cleavage.
4. C- Hardness. The ability to resist being scratched—or hardness—is one of the most useful properties for identifying minerals. Hardness is determined by the ability of one mineral to scratch another.
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