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Do Now – SILENTLY!. Take out your agenda Sheet, Science folder, packet, and 2 pencils What is a mineral? (Write all 5 characteristics) Draw a picture of a mineral. Look at the following minerals. Which do you think are the same types of minerals and which do you think are different?. - PowerPoint PPT Presentation
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Do Now – SILENTLY!Take out your agenda Sheet, Science folder, packet, and 2 pencils
1. What is a mineral? (Write all 5 characteristics)
2. Draw a picture of a mineral.
Look at the following minerals. Which do you think are the same types of minerals and which do you think are different?
HAHA! I tricked you!These are all the SAME type of mineral! These are all examples of the mineral QUARTZ!
Why is it so difficult to tell minerals apart!?There are at least 4,000 minerals
that we know of in the Earth’s crustAs you can see with quartz, often
times the same kind of mineral can look very different!
Therefore, geologists use several types of tests to determine the type of mineral they have found!
How to identify mineralsThere are many different ways, but we will explore the main ways!
Today’s objectiveKnow: Mineral Identification
Show: Explain how minerals are identified by their properties
LOT: Comprehension
How to take notes
Mineral property
How to test this property
Picture
ColorColor is the most noticeable characteristic of a mineral. However, it is also the least reliable characteristic.
ColorWith the colored pencils at your desk, draw a picture of two different minerals of two different colors (like Quartz)
Streak
Streak is the color of the line a mineral makes when it is scraped on a tile. (This is a better clue to a mineral’s identity than the surface color.)
StreakDraw a picture:
Fun fact: one way to tell the difference between pyrite (Fool’s gold) and real gold is by streak. Pyrite leaves a greenish-black streak while real gold leaves a yellow streak.
LusterLuster is the way a mineral reflects light from its surface. The two types of luster are:1. Metallic2. Non-Metallic
Luster – 2 types!
Draw a picture:Metallic: Non-Metallic:
HardnessHardness is a measure of how easily a mineral can be scratched.
Measured on Mohs scale 1-10
Mohs Scale – Fun facts! Your fingernail has a
hardness of about 2.5 A steel file has a
harness of about 6.5 A diamond is the
hardness mineral only another diamond can scratch a diamond
Hardness
Draw a picture
How a mineral breaksA mineral can break in two ways:
1. Cleavage: breaks into regular, flat pieces
2. Fracture: breaks into irregular, jagged pieces.
How a mineral breaks
Cleavage Fracture
What are the different ways we can test a mineral??????
There are FIVE major ways!
The tests:
1. COLOR2. LUSTER: Metallic or Non-
Metallic3. STREAK: color on tile4. HARDNESS: Mohs’ scale5. How a mineral b-r-e-a-k-s:
cleavage or fracture
CFU!What is the least most reliable
of all the properties? Why?What is the difference between
cleavage and fracture?What would happen if you
rubbed a mineral of a Mohs’ value 7 with a Mohs’ value 5?
Let’s Brain Pop! First watchThen fill out the quiz!
http://www.brainpop.com/science/earthsystem/mineralidentification/
CFUWhat is the streak test? How do
you perform it?What are the two different
types of luster? How do you know which is which?
Challenge question: Any other ideas of how we could test minerals!?!?!!?
How else can we tell minerals apart?DENSITY! (how tightly packed it is!)
ACID Test! (might form bubbles)
Fluorescence (normal light vs. ultraviolet light)
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