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Tufa is a deposit of calcium
carbonate, which is also what
makes up an eggshell. It is a
porous rock that often forms
around mineral springs.
Gneiss is a metamorphic rock
that can be identified by its
bands of varying composition.
Gneiss often forms around
convergent plate boundaries
and forms under very high
temperature and pressure.
7
Calcareous
Tufa
Gneiss
Muscovite is a mineral
belonging to the Mica family.
As a mineral, it can be found in
all three types of rock. It can be
sliced into thin, clear sheets and
therefore has been used to make
windows. It can also be crushed
and used to add a glitter effect
to paints or cosmetics.
Marble is a metamorphic
rock composed most commonly
of calcite. It is formed when
limestone is subjected to
heat and pressure inside the
earth. Marble is commonly
used for sculpting, construction,
and design.
Muscovite
Marble
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