To the chagrin of New York antiques dealers, lawmakers in Albany have voted to outlaw the sale of virtually all items containing more than small amounts of elephant ivory, mammoth ivory or rhinoceros horn. The legislation, which is backed by Gov. Andrew M. Cuomo, will essentially eliminate New York’s central role in a well-established, nationwide trade with an estimated annual value of $500 million.

Lawmakers say the prohibitions are needed to curtail the slaughter of endangered African elephants and rhinos, which they say is fueled by a global black market in poached ivory, some of which has turned up in New York.