Whiter than white

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>I would imagine that the use of chalk is simply because of the sheer whiteness of the material.

I presume that Silbury Hill is made of chalk because that's what the ground is.

Like the White Cliffs of Dover.

Chalk blocks and small sarsen pibbles used as the walling.
Must have been white for ooooh a month?

Exactly!

"I presume that Silbury Hill is made of chalk because that's what the ground is".

True nuff baza
but thornbro isn't made of gypsum. I read this thread as a question of why the henge builders of Wessex and N. yorks used the white material to create a visual effect.