Download Coarse Igneous rocks are classified according to their origin, texture

Classification of Rocks
Classifying Rocks
Igneous rocks are classified according to their origin,
texture, and mineral composition.
Origin Did it harden inside the earth or on the earth’s surface?
Texture Is it fine or coarse grained?
Mineral Composition
Is it dark colored, which is low in
silica or light colored, which is
high in silica?
from
lava
from
magma
Which of the following igneous rocks
are extrusive? How do you know?
1
2
3
4
5
6
7
8
9
This
sediment can
include
minerals,
small pieces
of plants or
other organic
matter. It is
compressed
over a long
period of
time before
creating a
rock.
Sedimentary
rocks are
formed by
sediment
that is
deposited
over time,
usually as
layers at the
bottom of
lakes and
oceans.
Fossils can be found in sedimentary rock.
Sedimentary Rock
clastic
chemical
organic
from
from
from
rock particles
once living
organisms…
plants & animals
dissolved minerals
in solutions or
water that
crystallizes
Categorized by:
particle size
plant
• shale
•
coal
•
rock salt
• sandstone
•
limestone
•
gypsum
• conglomerate
animal
Metamorphic Rocks
Metamorphic rocks are formed
when other rocks are exposed
to years of heat and pressure.
Foliated: grains are
arranged in layers, or
“bands.”
slate
Non-foliated: no
layered “bands.”
marble
schist
phylite
gneiss
quartzite
Metamorphic Rocks
Follow the arrows!
granite
marble
limestone
Metamorphic Rocks
Shale
Slate
Sandstone
Quartzite
That was fun!