The Study of Minerals *Use upload for pictures 1. Name the physical property (hardness, color, streak, etc.) described by each of the following statements. DESCRIPTION: PHYSICAL PROPERTY: Breaks along smooth planes: ___________________________________ Scratches glass: _______________________________________ Shines like metal: __________________________________ Scratching produces a red powder: _____________________________ Looks like broken glass: ______________________________ 2. What term is used to describe the shape of a mineral that has three directions of cleavage that intersect at 90-degree angels? _______________________________ 3. Describe the cleavage fo the minerals listed below. include the number of directions and degrees of cleavage angles (if appropriate). MINERAL: CLEAVAGE: Muscovite: _____________________ Calcite: _______________________ Halite: ______________________ Feldspar: _____________________ 4. What physical feature most distinguishes biotite mica from muscovite mica? __________________________ 5. Name a mineral that exhibits the physical properties listed below. (use the Photos in the upload, if needed) PROPERTY: MINERAL: One direction of cleavage: ________________________ Striations: ________________________ Multiple Colors: __________________ Cubic cleavage: ______________________ Nonmetallic, vitreous luster: ______________________ Fracture: _____________________ Metallic luster: _____________________ 6. Figure 1.32 illustrates the common crystal form of the mineral fluorite and the characteristic shape of a cleaved sample of fluorite. Identify each specimen (A or B) next to its appropriate description below. Cystal form of fluorite: ____________ Cleavage specimen of fluorite: ___________ 7. Refer to the photo in Figure 1.33 to complete the following. a. Describe the crystal form (habit) of this specimen. ______________________________________________________________________________ b. What term is applied to the lines on this sample? ______________________________________________________________________________ c. Based on what you can determine from this photo, use the mineral identification key (see figure 1.24) to identify this mineral. ______________________________________________________________________________ 8. A photo of agate, a variety of quartz composed of microscopically small crystals, is provided in Figure 1.34. Based on this image, describe the habit of this sample. _______________________________________________________________________________ _______________________________________________________________________________ 9. If a mineral can be scratched by a penny but not by a fuman fingernail, what is its hardness on the Mohs scale? ____________________________ 10. What term is used to describe the tenacity of muscovite? _________________________________________ 11. Use the mineral identification key (see Figure 1.24) to identify a mineral that is nonmetallic, dark colored, harder than glass, lacks cleavage, and is green in color. _________________________________ 12. For each mineral listed below, list at least one diagnostic property. MINERAL NAME: DIAGNOSTIC PROPERTY Halite: ______________________________________ Galena: ______________________________________ Magnetite: _____________________________________ Muscovite: _____________________________________ Hematite: ______________________________________ Fluorite: _______________________________________ Talc: _________________________________________ Graphite: ______________________________________ Calcite: _______________________________________ 13. List the two most common rock-forming mineral groups. _____________________________________ _____________________________________ 14. Providean economic use for each mineral listed below. Galena: _______________________ Hematite: _____________________ Graphite: ______________________ Sphalerite: _____________________ Gypsum: ______________________ Calcite: _______________________
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