Stanleyite

stanleyite

patronite

vanadium

alum-(K)

Images

Formula: V⁴⁺O(SO₄).6H₂O
Hydrated sulphate, vanadium-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 1.95 measured, 2.01 calculated
Hardness: 1 to 1½
Streak: White
Colour: Light blue to greenish blue
Solubility: Easily soluble in water
Environments

Sedimentary environments
Hydrothermal environments

Localities

At the type locality, the Ragra Mine, Huayllay District, Pasco Province, Pasco, Peru, initially stanleyite was found on a museum specimen of patrónite from a rich vanadium deposit. Associated minerals include patronite, pyrite, alum-(K) and quartz. The patrónite occurs as 1.5 mm fragments or efflorescences (HOM, AM 68.644-645).

Back to Minerals