Transcript Metamorphic Rock

•The
process by which existing
rock is changed by heat and
pressure is called
metamorphism
•Original
sedimentary or
igneous rock is known as parent
rock
•Limestone
marble
is the parent rock of
 Shale
transforms to many different rock
forms because of heat and pressure.
 Shale turns to slate then to phyllite. Then
after high temperatures phyllite changes
to schist. Deep within the crust schist
finally changes to gneiss.
 Heat
and pressure can break down the
bonds that join atoms in minerals. Then
the atoms join together differently as new
bonds form, this
is crystallization.
 Recrystallization
occurs when shale is
formed from silt and clay.
 Metamorphic rock
can occur over large
areas were both
heat and pressure
are high
 The
metamorphic rock slate is used for
tiles and some roof materials.
 Slate is useful for tiles because it displays
foliation.
 Foliation is an arrangement of minerals in
flat or wavy parallel line.
 With
high pressure and heat minerals can
develop such as mica to make the rocks
look shiny.
 Nonfoilated
rocks are rocks that don’t
show foliation are mainly made up of one
mineral. This type of rock such as marble
doesn’t split into layers.
 Another reason
nonfoilated rock
lacks foliation is
it lacks pressure.