Gingergrass could work to fatten up and smooth a metallic accord.
Here are a variety of notes that have metallic facets to them
top notes:
cedar leaf (metallic, extremely aromatic, slightly 'green' in aroma)
lime steam distilled (more metallic smelling than the cold pressed, in my experience)
ho wood or rosewood (both very linalool heavy)
elemi (peppery, lemony frankincense top note)
white spruce (less tree-like than the others)
black spruce (more of a flinty/stone note, combine with pepper, capsicum oil, or cepes absolute to enhance the mineralic effect)
middle:
some cheaper rose ottos (rosa gallica, some russian extractions, etc. These smell less like rose and are more metallic. Can have unpleasant top notes though that need to be masked with something strongly aromatic like cedar leaf or white spruce)
helichrysum oil, not the absolute (more haylike/white musky but could be seen as metallic)
ylang absolute (can be used to round off a blend, sort of minty/floral/white smelling. Much more minty smelling than any of the oil extractions. Use extreeemely small amounts)
juniper berry/juniper SC02 (the regular oil is a bit 'dirtier' but has more of a berry like presence to it than the SC02 extraction)
base notes:
frankincense
opoponax (more 'white musky' to my nose in the latter stages of the drydown but can augment a metallic accord)
capsicum oil (more peppery/flinty, can create a pepper like base note)
