Transcript Document

Standard/Objective: S6E5.b.
Investigate the contribution of
minerals to rock composition.
.
EQ: What are rocks
made of?
Minerals are
not made by
people; they
are …
…naturally occurring
substances.
What is a mineral?
• Naturally occurring (No human
input)
• Non-organic (they are not made by
life processes)
• Characteristic chemical
composition
• Distinctive physical properties
• Crystalline structure
Name four properties (or
clues) that scientists use
to identify minerals.
Color, luster, streak,
and hardness
Which property means
the way the light bounces
off the mineral?
Luster:
How minerals reflect light
What words can be
used to describe a
mineral’s luster?
Glassy, dull,
shiny, greasy
Why is color not a good property to
use to identify a mineral?
slate
limestone
Many minerals have
the same color.
Cleavage & Fracture
• Cleavage: planes of weakness along which
minerals can break
•
• Fracture: surfaces along which minerals can
break
Cleavage & Fracture
Best identified on a fracture surface
Streak:
• The powdered form of a mineral
What are three testers that
can be used to determine a
mineral’s hardness?
fingernail, penny, nail
Hardness
Based on Moh’s scale of
hardness
Find the Definition for the following
vocabulary word in the Text.
• Mineral-Naturally occurring inorganic solid that has a definite
•
•
•
•
•
•
•
•
chemical composition and an orderly internal atomic structure.
Crystal- solid in which the atoms are arranged in orderly ,
repeating pattern.
Silicate- minerals that contain silicon and oxygen and usually
one or more other elements
Hardness-Measure oh how easily a mineral can be scratched
Luster-describes the way a mineral reflects light from its
surface; can be metallic or nonmetallic
Streak-color of a mineral when it is in powdered from.
Cleavage- minerals that break along smooth, flat surfaces
Fracture- minerals that break with uneven, rough or jagged
surfaces
Specific gravity- the ratio of its weight compared with the
weight of an equal volume of water.