Obsidion mirror

Friends,

I’ve been commissioned to create an obsidian and silver mirror and
am seeking a source for the obsidian mirror part. Ideally, this
would be a round slab of obsidian about 4" in diameter, flat and
unpolished on the back with a polished, shallowly concave face, . If
any of you know of a source for such an item or someone who could
custom cut this, I’d appreciate hearing from you.

Walk in beauty!
Susannah Ravenswing
Jewels of the Spirit
Winston-Salem, NC