properties used to identify minerals
DESCRIPTION
Properties Used To identify minerals. Remember ! Rarely is a mineral identified by a single property . Physical Properties Color Streak Luster Hardness. color. Color is the most easily observed mineral property and the least useful! . - PowerPoint PPT PresentationTRANSCRIPT
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PROPERTIES USED
TO IDENTIFYMINERALS
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Remember!Rarely is a mineral
identified by a single property.
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Physical Properties
Color Streak Luster Hardness
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Color is the most easily observed mineral
property and the least useful!
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Color is not a good property to use to identify a mineral?
Many minerals have the same color.
slate limestone
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Color
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Some exceptions to the color rule would be cinnabar, which is always red, and
malachite, which is green.
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Many minerals have a similar color.
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Pure quartz is colorless or white, impurities can make the mineral rose, purple or
pink!
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Streak of a mineral is the color of its powder when rubbed on an unglazed white tile.
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The streak is often not the same color as the mineral.
A minerals color may vary, but the streak rarely will!
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The property that means the way the light bounces off the mineral?
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Luster refers to the way a mineral shines in reflected light.
Notice the difference between these two minerals?
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LusterHow minerals reflect light
Non-metallic
Metallic
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The mineral on the left has a metallic luster, the one on the
right, a nonmetallic luster.
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There are several terms used to describe nonmetallic luster.
Examples could be vitreous, like the quartz on the left, or pearly,
like the gypsum on the right.
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Words that can be used to describe a mineral’s luster?*Glassy *Shiny
*Dull *Greasy
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Other terms that might be used include greasy, dull, and earthy.
Can you tell which of these has an earthy luster and which has a
vitreous luster?
Earthy
Vitreous
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Earth Science 2nd, 3rd, 4thMonday, October 4, 2010
+ Collected homework assignment from Friday, October 1, 2010 * Read 9.2 {pages 163-169}
* Outline section 9.2+ Began class notes regarding “Properties used to Identify Minerals” + Read or reread section 9.2, then answer Critical Thinking questions 1-5 and Application 1-4 on page 171.