Sphalerite mineral is the most
important zinc ore.
It is often found with
galena which is a major lead ore.
The two are easily
confused, particularly because they occur together and can be
There are a couple of
varieties of sphalerite mineral.
by Ian Geoffrey Stimpson via Flickr
red varieties are called ruby jack, iron rich varieties are called
marmatite, and the massive banded varieties are called schalenblende.