Dictionary.net

• A mineral of resinous lustre and yellowish-green color. It is a native silicate of zinc. It is of rare occurrence in Europe, but is found in New Jersey, in rock-masses constituting a very valuable and important zincore.

1899 - The american dictionary of the english language.
By Daniel Lyons

• A mineral of resinous lustre and yellowish colour, a silicate of zinc.

1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.