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Properties of MineralsIntegrated Science
7 PropertiesCrystal FormHardnessCleavage and FractureLusterColorSpecific GravityStreak
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
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
Vitreous (Glassy)
Metallic
Dull
Pearly
Waxy
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.
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.
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.
Making A Simple Dichotomous MapThink about the important
characteristics that would define these animals!!!
Making A Simple Dichotomous Map
How would we make a Key for these organisms?
Notice we always are dividing these into two main characteristics!!!
Dichotomous Keys help identify things!!!
Can you figure out what these are?