1. MINERALS AND CRYSTALS
AUGUST 24, 2016

2. Why do materials glow in the dark?
Fluorescent materials – materials that have the ability to absorb invisible ultraviolet light and change it into light you can see.

3. Minerals
What are they?

4. Defining a Mineral? There are requirements… must be natural
not made by humans
must be inorganic
cannot be made from living tissue or remains of someone that was once living
must be a solid
not liquid or gas
must have a definite chemical makeup
example: salt is a compound made of the elements sodium and chlorine
must have crystal structure

5. Crystal???
What is it?
In a crystal, the atoms or ions in a substance are arranged in an orderly pattern that repeats over and over again.

6. Remember….
A material must possess all five of these characteristics to be classified as a mineral.

7. Crystal Formation Two ways that crystals may form…
Some form when melted or partially melted rock cools on or beneath Earth’s surface.

8. Crystal Formation Two ways that crystals may form…
Some form when minerals dissolved in water are left behind.