Mohs - 1 Hardness Less than 2.5 Description A mineral that...

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Description Hardness A mineral that can be scratched by your fingernail (hardness = 2.5). Less than 2.5 A mineral that cannot be scratched by your fingernail (hardness = 2.5), and cannot scratch glass (hardness = 5.5). 2.5 to 5.5 A mineral that scratches glass (hardness = 5.5). Greater than 5.5 Use the hardness guide in Table 1.2 to find an ex- ample of a mineral supplied by your instructor that falls in each of the three categories. Color Color, although an obvious feature of minerals, may also be misleading. For example, slight impurities in a mineral may result in one sample of the mineral having one color while a different sample of the same mineral may have an entirely different color. Thus, color is one of the least reliable physical properties. Observe the minerals in Figure 1.8. Both of the minerals shown are varieties of the same mineral, quartz. What is the reason for the variety of colors that quartz exhibits? '-
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Mohs - 1 Hardness Less than 2.5 Description A mineral that...

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