HÜBNERITE & QUARTZ ON FLUORITE
ABOUT THE SPECIMEN
Excellent combination piece of hübnerite, fluorite, and quartz out of the Mundo Nuevo mine in Peru. This particular combination of minerals has only ever been discovered at this one mine, and I'm not sure if I've seen one so attractive - very unique in the least! A well-formed crystal of hübnerite is protruded perfectly out of a large piece of fluorite. The fluorite consists of multiple generations of octahedral growths, with color zoning ranging from light pink to white. It's also etched all around, giving it a gorgeous, satiny sheen. Under the most lenient conditions many would consider it a floater - not really by my book, though it essentially looks as if it were. Sharp, clear, and undamaged crystals of needle quartz protrude all around, giving it extra dimension, and there's even a few growing right from the backside of the hübnerite. The specimen is complete and undamaged all around, and displays beautifully from every angle.
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The Mundo Nuevo district sits roughly 30 km northwest of Huayllapon near Huamachuco in the Peruvian Andes, where multiple family-operated adits work the same hydrothermal vein system in Mesozoic sedimentary rocks - the "Mundo Nuevo Mine" label in the trade encompasses Labor Teo, Labor Yaqui, La Gringa, and several other individually worked openings rather than a single operation. Hübnerite is the manganese end-member of the wolframite series, its deep blood-red to black color intensifying with increasing manganese purity; Hyršl's 2011 Mineralien-Welt account designated the district among the world's finest sources for the species. Crystals are tabular to bladed monoclinic prisms, typically on needle quartz matrix, with the most prized examples doubly terminated and freestanding. Fluorite occurs as small, transparent pale blue to colorless octahedra perched directly on hübnerite crystal faces - a paragenetically late phase that documents continued hydrothermal activity after the wolframite crystallized. A subset of matrix pieces also carries scheelite, occasionally as epimorphs beneath hübnerite where the calcium tungstate crystallized first and was subsequently replaced, leaving hollow wolframite casts. Multiple named adits continue producing sporadically, making supply ongoing but deeply inconsistent; fine doubly terminated hübnerite floaters with intact fluorite associates are a small fraction of total recovery.