minerals mrs. fritts 7 th grade science. fluorite fluorite is used in: toothpaste “fluoride”...
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Minerals
Mrs. Fritts7th Grade Science
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Fluorite
Fluorite is used in:• Toothpaste “Fluoride”• Pottery• Ceramics• Paint Pigment
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Halite (Rock Salt)
• Evaporation of lakes, seas• Commonly recognized as salt, halite is used in
human and animal diet, food seasoning and food preservation
• Mineral waters• Soap • Home water softeners • Highway de-icer• Ice Cream production
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Marble
• Used as stone in building construction and for making decorative items such as pillars, floor and bath tiles, table tops etc.
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Talc
• Softest • Baby powder
– Astringent for rashes
• Soapstone• Gymnastics to grasp Bars
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Copper
• Conductor• Currency• Electrical wires• Sculptures• Computer circuits and chips
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Quartz
• Gemstones• Glass manufacturing• Radios• Computers• Electronic equipment
– Piezoelectric property– Quartz clock
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Diamond
• Hardest Mineral• Cutting tools
– Dentist Drill
• Blades• Saws• Commercial Items
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Mining for Ores• A cheap way of locating ore deposit and bringing it
to the surface is to blast away the soil and rock which is called “overburden”
• Toxins - mercury, arsenic, selenium and lead • When gold is extracted, it is crushed and sprayed
with cyanide, which bonds with the gold. Cyanide then leaches. A dose of cyanide the size of a grain of rice is enough to kill a human while one millionth of a gram per liter of water is enough to kill fish.
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• The damage to land after a large-scale mining operation has finished is devastating and leaves the landscape so polluted that it cannot properly sustain life for thousands of years.
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Mineral ID Lab Introduction
• Performing Two Physical Property Tests– Hardness Test– Streak Test
• Use these two tests to identify a mineral
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Streak Test
• Often, minerals have a different color streak than the original color of the mineral.
• Test the streak of the minerals with a Streak Plate and write down the streak you see.
• Also, identify the color of the mineral
• Sometimes minerals have the same color and streak , so geologists use another test….
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Color and Streak Test
• Identifying six minerals using color and streak-– Garnet– Olivine– Red Hematite– Malachite– Magnetite– Hornblende
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Example TableNumber Name Color Streak
Garnet Red White
Olivine Green White
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Hardness Test1 = Talc2 = Gypsum3 = Calcite4 = Fluorite5 = Apatite6 = Feldspar7 = Quartz8 = Topaz9 = Corundium10 = Diamond
Finger Nail = 2.5 Copper Penny = 3.0Nail = 5.5 Glass Plate = 5.5Steel File = 6.5
Which minerals can scratch other minerals?