This lovely rock has been used as the splashback for my friends kitchen. It was sold to her as 'black granite' but you and I know there is no such thing.
A closer inspection shows that the white veins are composed of feldspars while the darker matrix contains a significant amount of greyish quartz. The rock has undergone a significant amount of stress as shown by the sigmoidal shape of the feldspar vein in the image above. I'd love to get my hands on a raw edge of this rock, or perhaps see it in strong sunlight so I can determine the composition better. It is however, a lovely rock.
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