corundum corundum is a very valuable mineral and it comes in many different colors
TRANSCRIPT
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CORUNDUM
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CORUNDUM
Corundum is a very valuable mineral and it comes in many different colors.
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CORUNDUM’S PROPERTIES
Color: Frequently gray, but also white, red, blue, yellow, and green.
Streak: Colorless.
Luster: Vitreous* and pearly.
Hardness: 9 on the scale. It is harder than topaz and quartz, but softer than diamond and moissanite.
*Vitreous: Glassy
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IT’S CRYSTAL SHAPE
Corundum has a hexagonal shape.
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WHERE YOU CAN FIND CORUNDUM
Corundum can be found in metamorphic and volcanic rocks in places like Burma, Thailand, and Sri Lanka.
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THE FORMULA OF CORUNDUM
The formula of corundum is AI203. (Aluminum Oxide)
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FUN FACTS
• Did you know that a red corundum is a ruby and a blue corundum is a sapphire?
• Corundum has no cleavage.
• Corundum is the 3rd hardest mineral.
• It was named "corinvindum" in 1725 by John Woodward. Richard Kirwan used the current spelling "corundum" in 1794.
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RESOURCES USED
http://geology.com/minerals/
http://www.ask.com/question
http://www.answers.com/
http://answers.yahoo.com/question
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CREDITS
Presented and created by: Helen and Elizabeth.
Helpers: Asad Soomro, Ben Rosenfeld, and Luke Capello.
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Properties Where is it found?
Moh’s Scale Random
100 100 100 100
200 200 200 200
300 300 300 300
BONUS
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WHAT IS CORUNDUM’S STREAK?
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COLORLESS
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WHAT IS CORUNDUM’S LUSTER?
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VITREOUS(GLASSY) AND PEARLY
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WHAT IS CORUNDUM’S USUAL COLOR?
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USUALLY GRAY
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TRUE OR FALSE: CORUNDUM IS FOUND IN BURMA.
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TRUE
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IS CORUNDUM FOUND IN METAMORPHIC/VOLCANIC ROCKS OR IN SEDIMENTARY ROCKS?
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METAMORPHIC/VOLCANIC ROCKS
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TRUE OR FALSE: SRI LANKA IS ONE PLACE CORUNDUM IS FOUND.
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TRUE
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TRUE OR FALSE: CORUNDUM IS 9 ON THE MOH’S SCALE.
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TRUE
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DAILY DOUBLESee Problem
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WHAT 2 MINERALS ARE HARDER THAN CORUNDUM?
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DIAMOND AND MOISSANITE
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WHAT NUMBER IS CORUNDUM ON THE MOH’S SCALE?
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9
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WHAT MINERAL IS NUMBER 8 ON THE MOH’S SCALE?
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TOPAZ
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WHAT IS A RED CORUNDUM CALLED?
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RUBY
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CORUNDUM’S SHAPE IS…
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HEXAGONAL
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TRUE OR FALSE: CORUNDUM IS THE 3RD HARDEST MINERAL.
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TRUE
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WHAT IS CORUNDUM’S FORMULA?
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AI203 (ALUMINUM OXIDE)
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