It occurs as efflorescences in mine tunnels or as a product leached out of surficial vanadium oxides by ground water.

[8] Pascoite can be easily synthesized by leaching oxides of calcium and vanadium with water to produce an orange-colored solution with an pH of about 4.6.

[9] Pascoite was discovered in the Ragra mine near Cerro de Pasco, Peru, where the mineral formed on the walls of an exploratory tunnel after its excavation.

[7] The specimens were transported by D. Foster Hewett from Peru to the United States Geological Survey laboratory for analysis.

[7] The type material is held in the United States at Harvard University in Massachusetts and the National Museum of Natural History in Washington, D.C.[3] Media related to Pascoite at Wikimedia Commons