Hydrated normal arsenate, autunite group. Uranospinite may contain a parallel core of zeunerite, on which it is epitaxial (Mindat).
Specific gravity: 3.45
Hardness: 2 to 3
Streak: Very pale yellow
Colour: Yellow, lemon-yellow to greenish yellow
Uranospinite is a secondary mineral occurring in the oxidised zone of
arsenic-bearing and uranium-bearing hydrothermal deposits
At the type locality, the Walpurgis Flacher vein, Weißer Hirsch Mine, Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany, uranospinite has been found associated with metazeunerite, metauranocircite, uranophane, trögerite, walpurgite, uranosphaerite and asselbornite (HOM, Mindat, AM 38.1159-1168).
At the Cherkasar deposit, Uzbekistan, uranospinite has been found with schoepite, paraschoepite, arsenuranylite, metazeunerite and nováčekite (HOM).
Uranospinite is an alteration product of uraninite (Webmin). It may dehydrate to metauranospinite (Mindat).
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