That's a useful list.

Burrowing around the web (looking for an index for wine - anyone know? - I never found it), I made a note of a few others that I came across. Might be useful to somebody so I'll post them. I can't vouch for their accuracy (I'm no natural scientist), but they came from optics/physics/materials science sites.

salt (sodium chloride) 1.54
ashphalt 1.635
flint 1.7-1.98
lead 2.6
sea water 1.341-1.36
vinegar 1.305
malachite 1.655

Jane