MINERALS.

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Presentation transcript:

MINERALS

DO NOW TASK Look at the minerals and the tools inside the container. Based on their characteristics, attempt to place them (classify) in two separate groups!

We use rocks & minerals every day…

What are Minerals?

Minerals are: A single element  S = Sulfur or C = Graphite Two or more elements chemically combined  SiO2 = Quartz NaCl = Halite

They are also: Naturally occurring- NOT man made! Inorganic – Never once living Crystalline – Definite internal arrangement of atoms!

MINERAL OR NOT?

How to Identify Minerals:

1. Color The COLOR of the mineral!!!!!

Sulfur

Olivine

Potassium Feldspar

Calcite comes in many different colors.

WHICH IS GOLD?

WHY DO I NEED MORE THAN COLOR?? Many minerals have similar colors! A single mineral may have multiple colors!

White minerals: Talc Gypsum Quartz Calcite

2. Streak Test The color of the mineral fragments when ran across a ceramic plate

How is using a pencil a streak test? What mineral is used in a pencil?

What is the difference?

3. Luster Metallic Non-Metallic The way a mineral reflects light Metallic or non-metallic Metallic Non-Metallic

4. Moh’s Hardness Scale – A minerals resistance to scratching

Which mineral will scratch the other? GALENA (2.5) vs OLIVINE (6.5)

5. Cleaving vs. fracture – The way a mineral breaks

If the mineral Cleaves: It breaks along even planes.

If the mineral has fracture: Broken pieces are jagged and irregular

6. Hydrochloric (HCl) Acid test on Calcite Fizzes on contact