Properties of Minerals

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Presentation transcript:

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 Fracture = breaks into random shaped pieces

5 Properties We Will Use Hardness Luster 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 Use Color Specific Gravity Streak 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 Keys A 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 Keys Keys 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 Map Think 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?