2. • Igneous rocks are formed from
solidification of magma or lava
which flows out from depth.
• Minerals such as quartz, feldspar,
pyroxene, olivine, amphibole, and
mica are the components of almost
all types of igneous rocks.
IGNEOUS ROCKS
Example of Igneous Rock
Volcanic
3. • Igneous rocks are characterized by intergrowth of crystals
and/or volcanic glass.
• Crystal size is directly proportional to the cooling rate of
magma.
FORMATION OF IGNEOUS ROCK
4. • Big crystals are formed
deep underground, while
smaller crystals are
formed near the surface.
FORMATION OF IGNEOUS ROCK
Cooling and crystal formation
5. Bowen’s reaction series is a general model is created to show the
progression of silicate crystallization at specific temperature.
6. • An extrusive igneous rock forms
when magma or volcanic fragments
erupt and solidify on Earth’s surface
which results to very fine-grained
rock with very small crystals that
could not be seen through naked
eye.
TYPES OF IGNEOUS ROCKS
Example of Extrusive
Igneous Rock
7. • An intrusive igneous rock
forms when magma
crystallizes within the crust
and is composed of
medium to coarse grains. It
is also known as a plutonic
rock.
TYPES OF IGNEOUS ROCKS
Formation of Intrusive
Igneous Rock
8. • Igneous rocks can be named using the binary system which
is mainly based on its texture and composition of the
rock.
NAMING OF IGNEOUS ROCKS
Classifying igneous rocks based on texture and composition.
Texture
Composition (silica content)
Felsic Intermediate Mafic
extrusive (volcanic) rhyolite andesite basalt
intrusive (plutonic) granite diorite gabbro
9. Igneous rock is formed from solidification of
magma or lava which flows out from depth.
1
Igneous rocks can be classified based on the
temperature-pressure condition.
2
3
Bowen’s reaction series shows the progression of
silicate minerals crystallization at specific
temperature condition.
10. WRITE THE NAME OF THE IGNEOUS ROCK BASED
ON THE DESCRIPTION GIVEN.
1. high silica content, coarse-grained texture
2. low silica content, fine-grained texture
3. high silica content, fine-grained texture
4. equal amounts of dark and light colored minerals, fine-
grained texture
5. low silica content, coarse-grained texture
11. BY JUST OBSERVING A
ROCK SAMPLE, HOW
WOULD YOU KNOW IF IT
IS AN INTRUSIVE OR
EXTRUSIVE ROCK?
