We don't have synonyms for rare metals yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are rare metal, bare metal and base metals.
(adj) :
pertaining to a distinct variety of organism; made from a single specific variety (especially of grapes in wine)
(n) :
a wine made primarily from or exclusively from a single variety of grape, which carries the name of that grape; by extension, a coffee made primarily from or exclusively from a single variety of coffee bean
"the varietal Merlot has rich red color and a robust fruity taste. Cabernet Sauvignon is a varietal that descended from Cabernet Franc and Sauvignon Blanc."
(adj) :
pertaining to a distinct variety of organism; made from a single specific variety (especially of grapes in wine)
(n) :
a wine made primarily from or exclusively from a single variety of grape, which carries the name of that grape; by extension, a coffee made primarily from or exclusively from a single variety of coffee bean
"the varietal Merlot has rich red color and a robust fruity taste. Cabernet Sauvignon is a varietal that descended from Cabernet Franc and Sauvignon Blanc."