Named for Fred Donald Bloss, who lived to be 100 years old. He was born shortly after the first world war, and during his lifetime plastic began to be mass-produced, the first transatlantic passenger flight happened (it took four days), the first electronic computer was built, and man went into space for the first time. What a life!


Formula: Cu2V5+2O7
Anhydrous vanadate, paramorph of ziesite
Crystal System: Orthorhombic
Specific gravity: 3.95 to 3.97 measured, 4.051 calculated
Streak: Red-brown
Colour: Black



The type locality, the Izalco Volcano, Sonsonate Department, El Salvador, is a basaltic stratovolcano that has been intermittently active since its birth in 1770, with the latest eruption in 1966. Analyses of condensates demonstrated that copper and vanadium were distinctive elements in the fumarolic gases. The high-temperature vanadium mineral shcherbinaite, was first discovered at Izalco.
Blossite was collected from the "Y" fumarole in the summit crater, in the outer sulphate zone of the fumarole, indicating a sublimation temperature between 100oC and 200oC. Associated copper vanadates in the fumarole include stoiberite, ziesite, fingerite and mcbirneyite. Only a few crystals of blossite had been isolated to the time of writing (1987), generally 100 to 150 microns in size (AM 72.397-400).

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