| Marmatite is chemically a ferroan sphalerite. It contains, in addition
to zinc sulfide, up to twenty percent of iron. It appears to be an uncommon
mineral, but that may be because it is brilliant black, much like brilliant
black sphalerite, and for the most part may remain unrecognized. Marmatite
is seldom mentioned in the literature. In general it appears to be sphalerite,
varying only in its composition. The Stari Trg mine at Trepca, Serbia (formerly
Yugoslavia) has produced some of the better crystals, which are particularly
showy when combined with snow-white quartz crystals. |
