War Memorial #2496- Perth 51st Highland Division EarthCache

The 51st Highland Division Memorial in Perth, Scotland, commemorates the The 51st (Highland) Division Memorial is located in Perth's North Inch park and pays tribute to all who served in the Division during both World Wars. The bronze sculpture, by Alan Herriot, depicts a kilted Highland piper being offered a rose by a young Dutch girl, symbolizing the Division's role in the liberation of European Allies in 1945.

Looking at the memorial, the are two plinths on either side. The feature you are looking at is on the left hand plinth.

1) Part of the plinth looks different to the rock that surrounds it. Can you describe it - mention the colour compared to the rock of the plinth and the shape and size.
2) Of the Veins, Enclaves and Xenoliths (see the description below for information on how to recognise them) which do you think this feature is?
3) Is the feature younger or older than the rock of the plinth?
4) Take a photo of yourself at GZ, or an identifying item, being careful not to reveal any of the answers to the questions. 

Please submit your answers via message though the Geocaching website or via email - there is no need to wait for a response before logging your find.

Granite Features

Enclaves

Enclaves form while the larger host rock, like granite, is still a molten magma body deep beneath the surface. This process begins when a blob of a different, usually darker and hotter, magma is injected into the cooler, more viscous granitic magma. Because the two magmas are chemically different, they do not fully mix, and the darker magma chills rapidly into a distinct, fine-grained inclusion. These blobs often stretch and become rounded as the surrounding granitic magma continues to flow before it finally solidifies, leaving behind the globular shape of the enclave.

Veins

Veins are geological features that form due to the movement of fluids within Earth's crust. First, cracks or fractures open up in existing, solid rock  because of intense pressure and stress. Superheated water, often carrying dissolved minerals like quartz or calcite, then flows through these new voids. As this mineral-rich solution cools down or undergoes a chemical change, the minerals start to precipitate out and crystallize, effectively filling the entire crack and leaving a vein, often appearing different to the rock that surrounds it due to the different chemicals that have formed it.

Xenoliths

Xenoliths, are foreign rock inclusions found within igneous rock formations, such as granite. Their formation begins deep within the Earth's crust, where molten magma slowly cools and solidifies to form granite. During this process, pockets of magma may intrude into existing rock formations, incorporating fragments of the surrounding rock into the cooling magma. These fragments, known as xenoliths, are often of different composition and texture compared to the surrounding granite. As the magma cools and crystallises over time, the xenoliths become trapped within the granite.

Xenoliths are usually visible. They have a different colour and density than the surrounding igneous rock. Xenoliths can be as small as a grain of sand or as large as a football, and as long as several meters.