Ferrimolybdite Big Cottonwood Canyon, Salt Lake County, Utah, USA Dimensions: 3.4 × 2.6 × 0.9 cm Provenance: Older collection specimen; original catalog label No. 325 included.
Yellow to golden-yellow Ferrimolybdite occurs abundantly as earthy to finely crystalline coatings across a contrasting gray and translucent matrix. Scattered metallic gray mineralization remains visible throughout, while the richly developed yellow coatings highlight fractures and crystal surfaces across the specimen.
Ferrimolybdite is a secondary iron molybdate mineral that typically forms through the oxidation and alteration of molybdenum-bearing minerals such as Molybdenite. Its characteristic yellow coloration makes it a distinctive secondary mineral in oxidized molybdenum deposits.
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