properties of minerals
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Properties of Minerals. Integrated Science. 7 Properties. Crystal Form Hardness Cleavage and Fracture Luster Color Specific Gravity Streak. 2 Properties We Will Not Use. Crystal Form Crystal Shapes Cleavage and Fracture Cleavage = breaks into pieces that are the same shape - PowerPoint PPT PresentationTRANSCRIPT
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Properties of MineralsIntegrated Science
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7 PropertiesCrystal FormHardnessCleavage and FractureLusterColorSpecific GravityStreak
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2 Properties We Will Not UseCrystal Form
◦Crystal ShapesCleavage and Fracture
◦Cleavage = breaks into pieces that are the same shape
◦Fracture = breaks into random shaped pieces
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5 Properties We Will UseHardness
◦Mohs’ Scale is 1-10◦1 is very soft and 10 is very hard
Luster◦How the light is reflected off the mineral◦Types
Vitreous (Glass-Like) Metallic Dull Pearly Waxy
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Vitreous (Glassy)
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Metallic
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Dull
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Pearly
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Waxy
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5 Properties We Will UseColorSpecific Gravity
◦A value greater than 1 means it sinks in water. ( Will feel “heavy.”)
◦A value less than 1 means it floats in water.
Streak◦Color left by a mineral when streaked on a
porcelain plate.◦Not always the same color as the mineral.
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Dichotomous KeysA dichotomous key is a tool used
to classify or identify certain items.◦In the natural world they help to
determine names of trees, wildflowers, mammals, reptiles, rocks, and fish.
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Dichotomous KeysKeys consist of a series of choices
that lead the user to the correct name of a given item.
"Dichotomous" means "divided into two parts".
Therefore, dichotomous keys always give two choices in each step.
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Making A Simple Dichotomous MapThink about the important
characteristics that would define these animals!!!
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Making A Simple Dichotomous Map
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How would we make a Key for these organisms?
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Notice we always are dividing these into two main characteristics!!!
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Dichotomous Keys help identify things!!!
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Can you figure out what these are?