Unformatted text preview: (http://mineral.galleries.com/minerals/property/color.htm ) The four types: Submetallic Luster, Vitreous Luster, Dull Luster and Resinous Luster 3. What are cleavage and fracture? What is the difference between them? Cleavage – result of a mineral breaking. Fracture – how the mineral breaks. How hard is a fingernail? On the Mohs Hardness Scale, 2.5 ( Gypsum ) How hard id a penny? On the Mohs Hardness Scale, 3.5 ( Calcite ) How hard is glass? On the Mohs Hardness Scale, 5.5 ( Apatite ) How hard are diamonds? ( Diamond ) 5. Is the streak of a mineral always the same as the color of it? Why? While streak is often closely linked to color, it is a different property. Streak is “the color of the powder of a mineral. It is called streak because the proper way to test for streak is to rub a mineral across a tile of white unglazed porcelain and to examine the color of the "streak" left behind.”...
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- Spring '10
- Mineralogy, Mohs scale of mineral hardness, streak, Mohs Hardness Scale