Nonmetallic Minerals

Nonmetallic Minerals - Figure 1.8 Two varieties of the...

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Figure 1.7 Hematite. An ore of iron that has both a metallic (left) and nonmetallic (right) form. Regardless of luster or color, the streak of the mineral is characteristically red-brown. (Photo by E. J. Tarbuck) Figure 1.9 Muscovite mica (light color) and biotite mica (black) are similar in appearance, except for color. Both of these rock-forming minerals have a nonmetallic, glassy luster and one direction of cleavage. (Photo by E. J. Tarbuck)
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Unformatted text preview: Figure 1.8 Two varieties of the mineral quartz. Rose quartz (left) and smoky quartz (right) each have a hardness of seven and fracture when broken. (Photo by E. J. Tarbuck) Figure 1,10 Hornblende. A generally green to black, rock-forming, amphibole mineral that often occurs in prismatic crystals (left) and has two directions of cleavage at 56 and 124 (right). (Photo by E. J. Tarbuck)...
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