New Mexico Mineral Symposium — Abstracts

The famous zinc deposits of Franklin—Ogdensburg, Sussex County, New Jersey, are uniquely composed of willemite, zincite, and franklinite as the primary ore minerals. The deposits are world renowned for the large number of outstanding fluorescent minerals and complex, rare mineral assemblages. One of these assemblages is the arsenate minerals found between about 1972 and 1985 from the Sterling Hill mine. Many new species were found including sterlinghillite, parabrandtite, kraisslite, and kolicite, as well as superb examples of known arsenates such as sarkinite, allactite, chlorophoenicite, koettigite, brandtite, legrandite, and holdenite. It was observed that the arsenates of Sterling Hill were found in substantially separate distributions, depending on whether they were in red ore, black ore, or adjacent marble. A summary of these observations will be presented, along with slide images of some of the Sterling Hill arsenates and associated minerals.