You are correct, Beth- I googled it- although the material which I
always thought of as zincite is a secondary product of zinc smelting
and is formed in the chimneys of zinc smelting facilities in Poland,
I now know that zincite also occurs naturally, the best known
sources being the zinc and manganese mines of Sterling Hill and
Franklin, New Jersey.
Here is the link-
http://mineral.galleries.com/minerals/oxides/zincite/zincite.htm
Lee Einer