Rocks:

1
Rocks

• How to identify them

2
Classifying Rocks

• When we look at rocks we use the following things
  to help us classify them
• Mineral Composition
• Color
• Texture

3
Composition

• Composition refers to what minerals are in the
  rock. These are referred to as grains.
• If rocks were cookies and candies, the minerals
  or grains would be the ingredients.

4
Color

• Color on its own is not enough to help us
  identify a rock, but it can help us tell what
  minerals the grains are.

5
Texture

• Texture is the look and feel of the rock.
  Geologist use grain size, shape and pattern to
  help them distinguish one type of rock from
  another.

6
Grain Size

• Grain size come in fine, coarse, and non-visible.

Coarse grain
Non-visible
Fine grain
7
Grain Shape

• Grain shape comes in either Rounded or Jagged.

rounded
Jagged
8
Grain Pattern

• The grains of minerals in rocks can form
  patterns. They can have straight lines, bends
  swirls or just a random pattern. The two main
  types are Banded and Non-banded.

Random pattern
Banded