Stolzite

Stolzit, under different, outdated, mining terms as Scheelbleierz, Wolframbleierz, Scheelbleispat (h) and Scheel Acid Lead is known, a rarely occurring mineral from the mineral class of " sulfates, selenates, tellurates, chromates, molybdates and tungstates " is, precisely, a lead tungstate having the chemical composition Pb [ WO4 ]. It crystallizes in the tetragonal crystal system and developed mostly dicktafelige to kurzsäulige or pointed dipyramidal crystals, but also sheaf -shaped to spherical aggregates of greyish-yellow, brown, orange yellow, red or green color. The crystal faces show a resinous to adamantine luster.

Stolzit crystallized isomorphic to Wulfenite (Pb [ MoO4 ] ) and scheelite (Ca [ WO4 ] ), that is identical crystal forms from.

Etymology and history

Stolzit was first described in 1845 by Haidinger and named after Joseph Alexander Stolz ( 1803-1896 ).

Classification

In the old classification of minerals according to Strunz ( 8th edition ), together with the Stolzit Paraniit - (Y), Powellit, scheelite and Wulfenite a separate group in the department of " molybdates and tungstates " and the class of " sulfates, selenates, tellurates, chromates, molybdates and tungstates ". Since the reorganization of the Strunz'schen Mineral classification ( 9th edition ) is divided the department of fine and the mineral is now in the subdivision of " molybdates and tungstates without additional anions or H2O". The still existing mineral group was to the minerals fergusonite - (Ce), fergusonite - (Nd) (N) and fergusonite - (Y ) expands.

The strict sorted by the crystal structure systematics of minerals by Dana assigns the Stolzit in the department of " water clear molybdates and tungstates with the general composition A XO4 ". There he is only with Wulfenite own group.

Modifications and varieties

Raspit is a monoclinic modification of lead tungstate.

Education and Locations

Stolzit is a typical secondary mineral, which is formed by the weathering of primary lead minerals in the presence of the tungsten-containing solutions.

Locations include New South Wales (Broken Hill, Kangaloolah ) and Tasmania ( Hampshire) in Australia; ; Minas Gerais in Brazil; Sofia Province in Bulgaria; at Tianjin in China; Baden- Württemberg, Bavaria, Saxony -Anhalt and Saxony in Germany; Alsace, Auvergne, Franche -Comté Languedoc -Roussillon Limousin and in France; Macedonia in Greece; different regions in Italy; Honshu in Japan; British Columbia, Canada; Carinthia ( Bleiberg ) and Salzburg ( Hüttwinkl ) Schellgaden in Austria; Bohemia in the Czech Republic; and many regions in the United States.

Crystal structure

Stolzit crystallizes in the tetragonal crystal system, space group I41 / a with lattice parameters a = 5.45565 Å and c = 11.9923 Å and four formula units per unit cell.