Identifying Minerals 3-2 pg 65-6711/19/14

1
Identifying Minerals 3-2 pg 65-67 11/19/14

• IN If you had to describe how one mineral is
  different from another, how might you describe
  its properties?

2
3-2 Identifying Minerals

• How are these two minerals are the same? How are
  they different?

3
Properties of Minerals

• Color
• Luster
• Streak
• Cleavage and Fracture
• Hardness
• Density
• Special Properties

4
Color

• The same mineral can come in different colors.
• Impurities
• Quartz-white, red, pink, and purple
• Weathering
• Pyrite turns black
• Color is not a very reliable indicator of a
  minerals identity.

5
Luster

• The way a surface reflects light. (How it
• Shines)
• There are 3 types
• Metallic
• Submetallic
• Nonmetallic (vitreous, silky, resinous, waxy,
• Pearly or Earthy)

6
Metallic Luster

• Looks shiny, like metal.

7
Nonmetallic Luster

• Does not look like metal.

Vitreous quartz
Pearly talc
Earthy psilomelane
8
Submetallic

• Has properties of both metallic and nonmetallic.

Hematite
9
Streak

• The color of a mineral in a powdered form. (shows
  its true color)
• The color of a mineral is not always the color of
  its streak.

10
Streak

• A minerals streak is not affected by weathering.
• Therefore, a minerals streak is much more
  reliable than its color.

11
Cleavage

• The tendency of some minerals to break along flat
  surfaces.

12
Cleavage
13
Fracture

• The tendency of some minerals to break unevenly
  along curved or irregular surfaces.

14
Hardness

• A minerals resistance to being scratched.

15
Density

• The measure of how much matter there is in a
  given amount of space.
• Remember the density of water1g/mL

16
Special Properties

• Properties that are particular to only a few
  types of minerals.

17
Special Properties

• Fluorescence

18
Chemical Reaction

• Calcite will fizz with acid

19
Optical Properties
20
Radioactivity

• Uranium

21
Magnetism

• Magnetite

22
Taste

• Halite
• Tastes salty

23
Check out these!
24

• OUT How would you summarize the seven
  properties of a mineral?