I recall having heard of him but I've never seen pictures. I own a tiny opalized Nautilus shell, though, so I can imagine what he might look like.
Opals are a pretty cool variation of quartz! I've always been a bit envious as we don't have an opals here. But then we have rose quartz, amethysts, citrin, sceptre quartz, rutil quartz, layer quartz, hyalithe etc.
I used to collect everything in the quartz-line but now my collection is quite complete. Most of it I found myself. Only the opals are bought. I have a black one, a few sparkly white ones and a few pieces of opal matrix (mostly black opal and the milky variant)