This specimen features rare, partly broken octahedrons of gahnite, a zinc-rich spinel mineral, from the historic Franklin Mine in New Jersey. Gahnite, known for its black green to blue hues, is often found as massive or microcrystals, making even these cleavage-dominated examples relatively uncommon and desirable. Some intact faces can be seen on the octahedron on the top. The specimen’s calcite matrix fluoresces bright orange under shortwave UV light, a classic feature of minerals from Franklin, which is renowned worldwide for its rich mineral diversity and unique fluorescent specimens. This piece exemplifies the rare crystallized form of gahnite typically encountered in trace amounts in Franklin's zinc ore deposits.
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