Type of rock

Diorite is an intrusive igneous rock formed when magma rich in silica cools slowly deep within the Earth's crust.

What does it look like?

Diorite is a coarse-grained, intrusive igneous rock with a "salt and pepper" appearance, typically composed of large crystals of plagioclase feldspar mixed with dark minerals like hornblende and biotite, giving it a speckled black and white color.

How/where does it form?

Diorite is an intrusive igneous rock formed when magma rich in silica cools slowly deep within the Earth's crust.

Does it belong?

Diorite in this amount would NOT normally be found on an Island like Santorini (Thera).