The Drinking fountain, composed mainly of Granite is placed between the cenotaph and the Edward Colston statue.
This water feature is a highly polished example of granite in different colours.
Granite is formed from Magna and is an intrusive igneous rock.
MAGMA
Magma is molten and semi-molten rock, containing minerals such as quartz and feldspar, also dissolved gases.
Formed from high temperatures and pressures in the Earth.
Extrusive rock - Magma is expelled from fissures or volcanoes and cools quickly, not allowing much time for minerals to Crystallize.
Very small crystals present.
Intrusive - Magma is cooled slowly under the Earths surface in a magma chamber and minerals Crystallize, as visible in Granite.
The minerals present in the magma, are responsible for the variety of colours.
An abundance of certain minerals creates different colours., a mixture of minerals may create slightly different shades .
Quartz - Milky white
Feldspar - off white
Potassium Feldspar - Salmon pink
Amphibole - Black/dark green
Muscovite - Gold/yellow
Biotite -Black/Dark Green
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All the information above will help you answer these.
1) What minerals could have created the colour of the water collection bowls?
2) Why do we know this is an intrusive rock, that has not been expelled from a volcano?
Information next to Feature will tell you this one.
3) What does this fountain commemorate?