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Mineral Worksheet _1 Answers and Exam Review - Lincoln Park ...ppt

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Mineral Worksheet _1 Answers and Exam Review - Lincoln Park ...ppt Powered By Docstoc
					 Mineral Worksheet #1
Answers and Exam Review


   Exam Tomorrow,
     March 14th
1.   m   The way a mineral reflects or “reacts” to light.                                             a. Native Element
2.   j   A mineral’s resistance to being scratched.                                                   b. Cubic
3.   o   Magnetic                                                                                     c. Hexagonal
4.   k   This crystal system has three axes that all intersect at oblique angles.                     d. Effervesces

5.   l   The color of a mineral’s powder when rubbed across an unglazed porcelain plate.              e. Monoclinic

6.   g   When minerals don’t break along cleavage lines.                                              f. Crystalline Solid

7.   i   This crystal system has three axes of different length that intersect at 90 degree angles.   g. Fracture

8.   a   When a mineral exists as a single element.                                                   h. Color

9.   b   This crystal system has 3 axes of equal length that intersect at 90 degree angles.           i. Orthorhombic
         This crystal system has three horizontal axes that are the same length and intersect at
10   c   60 degree angles, and one longer vertical axis.
                                                                                                      j. Hardness

         This crystal system has three axes, two of which intersect at right angles and one that
11   e   intersects the other two a an oblique angle.
                                                                                                      k. Triclinic

12   d   This is when a mineral reacts with a weak acid to produce bubbles.                           l. Streak
13   p   This is the plane or planes in which a mineral tends to split.                               m. Luster

14   n   Glows when a black light is shined on a mineral                                              n. Fluorescence


15   h   The most misleading property of a mineral, in terms of determining its identity              o. Magnetic

16   f   This is something that has its atoms arranged in a repeating pattern.                        p. Cleavage
17. What are four conditions that
    define a mineral?
  • naturally occurring
  • abiotic
  • repeating pattern of atoms
    (crystal)
  • definite chemical composition
18. What is 1 reason that color isn’t a
    good method of identifying minerals?
  • more than one mineral can have a
    particular color
  • a mineral can exist as more than
    one color
  • some minerals change color over
    time
19. What are the two types of luster?

  • metallic
  • non-metallic
20. List as many of the acceptable adjectives for
    luster as you can. Next to each adjective, write
    a description and give one mineral that can be
    used as an example of that type of luster.
• waxy          • like a candle     • rose quartz
• vitreous      • glassy            • crystal quartz
• dull          • well, dull        • red hematite
• earthy        • no luster         • limonite
• adamantine • most brilliant       • diamond
• pearly        • like a pearl      • muscovite
• silky         • like a silk shirt • malachite
• greasy        • an oily sheen     • talc
• resinous      • syrupy-shiny      • sulfur
21. List as many of the acceptable adjectives for
    fracture as you can. Next to each, write a
    description and give one mineral that can be
    used as an example of that type of fracture.
•   conchoidal   •   like sea-shell   •   rose quartz
•   even         •   smooth           •   kaolinite
•   fibrous      •   stringy          •   gypsum
•   splintery    •   needles          •   malachite
•   uneven       •   less smooth      •   magnetite
•   brittle      •   crumbly          •   limonite
•   sectile      •   can be carved    •   sulfur
22. For properties of luster and fracture, we are
    restricted in the words we can use. Explain
    why do we use a reduced vocabulary?

   • a reduced vocabulary increases
     the objectivity and improves
     accuracy.
23. There are a few minerals that you have
    worked with over the past week that are
    very distinctive and should be able to be
    identified by sight only. Name one
    mineral that you can (or should be able
    to) identify simply by looking at it.
    Explain what is so distinctive about this
    mineral, that allows you (or should) to do
    this.
24. There are two ways to describe
    cleavage, describe what they are and
    how they are used.
  • quality of the cleavage (how easily it is
    seen or detected)
  • the planes (& angles) of the cleavage.
25. Name one mineral that has an
   easy to see cleavage.
26. List three tests that you could
    perform on a mineral to help
    identify it.

- hardness (Moh’s hardness scale)
- streaking (to see the color)
- weak acid test (effervescence)
- black light (fluorescence)
27. Of all the tests that can be
   performed on a mineral to help
   identify it, which one is the most
   useful? Why?
28. Write the defining mineral for each level
    of the Moh’s Hardness Scale in the table
    below.
Moh’s Hardness Number      Defining Mineral
          1                     Talc
          2                   Gypsum
          3                    Calcite
          4                   Fluorite
          5                    Apatite
          6              Orthoclase Feldspar
          7                    Quartz
          8                    Topaz
          9                  Corundum
         10                   Diamond
29. List the tools that are used to determine
    hardness. Write the Moh’s hardness
    number next to each tool.


        Tool            Moh’s Hardness Number
     Fingernail                 2.5
      Steel Nail                4.5
     Glass Plate                5.5
     Streak Plate               5-8
30. Why does the hardness of some
   minerals have such a large range?

 - minerals naturally occurring and
   can vary in hardness because of
   natural variation
31. List six of the eight most common
   elements in the earth’s crust?
  - oxygen (O)
  - silicon (Si)
  - aluminum (Al)
  - iron (Fe)
  - calcium (Ca)
  - sodium (Na)
  - potassium (K)
  - magnesium (Mg)
32. Define the word abiotic?



 Natural, but not from or of any
 biological or living organism.
33. What is one way that minerals
   form?

 - hot magma or lava cools
 - water containing minerals evaporates
 - sustained heat and pressure change one
   mineral into another
34. Why do we study minerals?


 - minerals are the starting point
   for understanding ALL geologic
   phenomena
35. You have studied minerals for
   approximately two weeks. What
   is a rock and how is it different
   than a mineral?

 Rocks are made of an aggregate
 (gathering or mixture bound into one
 object) of minerals.

				
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