Warm-Up September 4
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Transcript of Warm-Up September 4
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Warm-Up September 4 True or False
Ice is a mineral. Explain your answer.True. It is a solid Specific chemical composition (H20) Crystal structure (cubic)
Naturally occurring (not made by man) Inorganic (never alive)
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Warm-Up September 5
The mineral on the left has a ______ luster,the one on the right, a ___________ luster.
metallic nonmetallic
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MYP Unit Question: What’s a world without rocks? Area of Interaction: Human Ingenuity
Learner Profile: Thinker
Standard: Students will investigate the scientific view of how the earth’s surface is formed. Learning Target: Today I am learning about the properties of minerals because minerals are in everything around me.
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Activator: Naica Crystal Cave – Mexico
Work Session Properties of Minerals Notes (continued) View mineral specimens
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Properties of MineralsGeologists use
characteristics to tell one mineral from
another
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Mineral Properties we will study
Luster Hardness
Cleavage Streak
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Luster• Refers to the way light reflects
from the surface of the mineral.
• There are two types of luster - Metallic: looks like polished metal. –Nonmetallic: can be shiny or dull.
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Pyrite has metallic luster
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Quartz has nonmetallic luster
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Hardness• Is measured by how easy it is to
scratch. • Geologists order the hardness by…
Moh’s Hardness Scale
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If the reference mineral scratches your mineral, the reference mineral is harder than your mineral.
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• Talc and Graphite are the softest minerals and can be scratched by a fingernail.
Talc Graphite
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Gypsum is soft, it can be scratched by a fingernail.
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Calcite is soft, but a little harder because it cannot be scratched by
a fingernail, but it can be scratched by a penny.
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Fluorite is harder. It can be scratched by a nail, but not a
penny or fingernail.
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Diamonds are the hardest mineral, so it scratches every mineral.
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Cleavage/FractureCleavage - Some minerals split
easily along a flat surface.
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Feldspar splits readily in two directions, always at or near right
angles.
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Calcite and galena cleave in three directions.
They are said to have three good cleavages.
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Fracture - an uneven break
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Streak
• Red chalk - red marks. • White chalk - white marks. • Not all minerals work this way.
The color of a mineral in powdered form.
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Gold• When gold is run
across a streak plate it makes a yellowish-gold color.
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Pyrite or “Fool’s Gold”• When pyrite is
run across a streak plate, it has a black or dark green streak.
• fool’s gold.
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Hematite• Hematite’s color is
grey, but its streak is red.
• The mineral was named hematite because it looked like it was bleeding when it was taken across a streak plate.
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One mineral property we will
not use…COLOR
The least reliable.
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A mineral can be many different colors. Below is Mica.
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Fluoritehas many colors
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Many minerals can be the same color. Below are gold colored minerals. Which one
is gold?
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The answer…None of them
were real gold.
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Other properties
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Density – the ratio of the mass of a substance
to the volume of a substance.• How many atoms are in a
specific amount of space.• Density = mass
volume
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Closing:
Turn to your table partner and share as many of the “other properties” of minerals that you can.