2.1 guided reading. c. solid d. crystal structure e. definite chemical composition b. streak c....
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2.1 Guided Reading
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C. SolidD. Crystal StructureE. Definite chemical composition
B. StreakC. Luster
E. HardnessF. Crystal systemsG. Cleavage & fracture
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1. Because minerals are formed by processes that occur in the natural world, they are said to be naturally occurring.
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a. Inorganicb. Solidc. Crystal structured. Definite chemical composition
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4. A substance that keeps its shape because its particles can’t flow freely is a solid.
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3. Because minerals do not come from living things, they are said to be inorganic.
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5. A solid with flat sides that meet at sharp edges and corners is called a crystal.
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6. Is the following sentence true or false?
A mineral always contains certain elements in definite proportions.
TRUE
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7. Is the following sentence true or false?
Very few minerals are compounds.
FALSE
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8. A substance formed when two or more elements combine and lose their distinct properties is a COMPOUND.
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9. In what two ways can elements occur in nature?
In a pure form and as a part of a compound
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10. What are some examples of minerals that occur as elements instead of compounds?
Copper, silver, and gold
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11. Is the following sentence true or false?
Geologists have identified about 3oo minerals.
FALSE
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12. Is the following sentence true or false?
Each mineral has its own specific properties.
TRUE
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13. What can’t color alone be used to identify most minerals?
Different minerals may have the same color.
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14. The color of a mineral’s powder is its STREAK.
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15. The term that describes how a mineral reflects light from its surface is luster.
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16. Is the following sentence true or false?
Minerals containing metals often have a shiny luster.
TRUE
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17. Circle the letter of each sentence that is true about the density of a mineral.
C. Each mineral has a characteristic density.
D. The density of a mineral is its mass divided by its volume.
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18. What is the Mohs hardness scale?
A scale that ranks ten minerals from softest to hardest
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19. The softest mineral known is TALC. The hardest known mineral is DIAMOND.
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20. Is the following sentence true or false?
A mineral can scratch any mineral harder than itself.
FALSE
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21. Is the following sentence true or false?
Each piece of a mineral has the same crystal structure?
TRUE
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22. How do geologists classify crystal structures?
Into six groups based on the number and angle of the crystal faces
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23.
Cleavage – (a) a mineral’s ability to split easily along flat surfaces
Fracture – (c) the way a mineral looks when it breaks
Fluorescence – (b) a mineral’s ability to glow under ultraviolet light
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Cleavage vs Fracture
http://www.kidsloverocks.com/html/mineral_cleavage.html
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Mineral Overview
https://www.youtube.com/watch?v=8a7p`1NFn64s