Formula: Al(VO4).3H2O
Hydrated vanadate
Crystal System: Monoclinic
Specific gravity: 2.52 to 2.58 measured, 2.58 calculated
Hardness: 2½ to 3
Colour: Canary-yellow, greenish yellow, olive-green
Solubility: Readily soluble in dilute mineral acids forming a deep cherry-red solution; insoluble in water

Sedimentary environments
Metamorphic environments
Hydrothermal environments

Steigerite is a secondary mineral occurring either as impregnations in sandstone or as a weathering product from vanadium-rich schist (Mindat).


At the Balasauskandyk V Deposit, Shieli, Kyzylorda Region, Kazakhstan and the Kurumsak V Deposit, Aksumbe, Turkistan Region, Kazakhstan, in several mines in these areas steigerite occurs as a weathering product in vanadium-rich schist. Associated minerals include vanalite, hewettite, delvauxite, satpaevite, gypsum, vashegyite, variscite, halloysite and alunite (HOM).

At the Monument No. 2 Mine, Monument No. 2 channel, Yazzie Mesa, Cane Valley Mining District, Apache County, Arizona, USA, steigerite is associated with navajoite, tyuyamunite, rauvite and hewettite (HOM).

At the type locality, the Sullivan Brothers claims, Gypsum Valley Mining District, San Miguel County, Colorado, USA, bright yellow, powdery steigerite was found in the uranium and vanadium claims coating cracks in nodular concretions of corvusite in the sandstone. Steigerite, fervanite and gypsum fill the minute fractures in the corvusite concentrations and are the last vanadium minerals deposited. It appears that the following sequence of vanadium minerals occurred:
Vanoxitecorvusitesteigeritefervanite (AM 20.769-772)).

Back to Minerals