Check point 3: Rocks near Warwick Hotel
The rocks near the Warwick
Hotel are mainly granite,
which is a kind of well-jointed
and coarse grained rock. Its
mineral composition is mica,
feldspar and quartz. After long
time of weathering, parts of
the
rock
surface
are
significantly different in colour
with the parent rocks.
 Texture of weathered granite
Warick
Hotel is near
the sea, so
there
is
onshore wind
constantly. The
onshore wind
brings
water
and salt to the
rocks
and
accelerates
chemical
weathering. As
granite
is
 Examples of joints
well-jointed
and the rock surface is clearly marked with groups of parallel
fractures running across each other, it is susceptible to weathering.
The process first takes place along the joints and then proceeds
further inward. The minerals contained in granite react with air and
water to form materials like iron oxides. When such surfaces are
exposed, we can see they are darkened in colour.
 A marked surface of coarse grained granite
 Darkened surface after weathering