Pucherite

pucherite

schumacherite

beyerite

bismutite

Images

Formula: Bi(VO4)
Anhydrous normal vanadate, the orthorhombic paramorph of clinobisvanite (monoclinic) and dreyerite (tetragonal). It changes to the monoclinic form above 500oC (Dana).
Specific gravity: 6.69 calculated
Hardness: 4
Streak: Yellow
Colour: Reddish brown, dark reddish brown, greenish-brown, orange, yellowish brown, yellow-brown in transmitted light
Solubility: Soluble in hydrochloric acid with evolution of chlorine to give a deep red solution, which turns green upon dilution and deposits a yellow basic chloride (Mindat)
Environments:

Pegmatites
Hydrothermal environments

Pucherite is a rare alteration product of other bismuth minerals in the oxidised zone of some hydrothermal ore deposits, and in zoned granite pegmatites. Associated minerals include bismuth, bismutite, beyerite, bismuthinite, schumacherite and clinobisvanite (HOM, Mindat, Webmin).

Localities

At the Sand Prince shaft, Sand Queen mines, Comet Vale, Menzies Shire, Western Australia, crystals of pucherite to 25 microns on vein quartz associated with jarosite and traces of gold have been found on the dumps. Pucherite typically occurs as a secondary alteration product of native bismuth and bismuth sulphides in hydrothermal veins and pegmatites (AJM 12.1.21).

At the type locality, the Pucher Shaft, Wolfgang Maaßen mines, Schneeberg, Erzgebirgskreis, Saxony, Germany, pucherite is associated with schumacherite, clinobisvanite bismutite, bismuthinite, bismuth and beyerite (Mindat).

At Mt Ibity, Ibity massif, Ibity, Antsirabe II, Vakinankaratra, Madagascar, pucherite is found in pegmatites with native bismuth (Dana).

At the Ampangabé pegmatite, Miandrarivo, Faratsiho, Vakinankaratra, Madagascar, pucherite is found with bismuthinite (Dana).

At the Stewart Mine, Tourmaline Queen Mountain, and the Pala Chief Mine, Chief Mountain, both at Pala, Pala Mining District, San Diego County, California, USA, pucherite is found in a pegmatite as an alteration product of native bismuth (Dana).

Back to Minerals