Another Marbley colour. The name quartz might imply some translucency - but not so far as I can see in the colour.
It's a beigey grey'y colour with a darker core.
The texture of the rods I got is a little rough - just fyi. Again - just to help you ID that mystery glass.
It stays fairly the same colour, and again, some brown and blue-grey marbling. You can see you get more of it when you work it and mash (the leaf on the left) vs the waves on the right, in which the glass get laid down in a more organized fashion.