1. Pyrite is a yellowish mineral that looks like gold and is commonly calledfool's gold. What is the property of mineral exhibited by pyrite wherein itreflects light and with a metallic look?A. ColorB. HardnessC. LusterD. StreakQuartz can break other than along planes of cleavage. What propertyof minerals is shown in this situation?A. CleavageC. HardnessB. FractureD. StreakSome minerals like mica has surfaces with planes of weak bonds in thecrystals. Thus, its crystals can be peeled like layers of onion. What is tproperty exhibited by mica?A. CleavageC. HardnessB. FractureD. TenacityThich property refers to the resistance of minerals to scratching?A. CleavageC. HardnessB. FractureD. LusterAnswer1.C -luster2.B- fracture3.A- cleavage4.C -hardness5.B -minerals6.D -streak7.C -opaque8.C -luster9.C -mineral10.B -hardness11..A -aragonite12. D -texture13.C -organic14.A -cleavage15.A -crystal
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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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