Topaz pseudomorphs (Pyknite) after potassium feldspar –
Römerschacht, Altenberg Tin Mine, Sächsisches Erzgebirge, Germany
 
Honey-yellow Pyknite pseudomorphs after Potassium feldspar, as a 7 x 4 cm-sized group of "Stengeltopas" (columnar Topaz) in a groundmass of Quartz and flaky black Zinnwaldite mica. A classic piece from the world-famous "Stockscheider" pegmatite cap of the Altenberg tin ore deposit! Historic find 1968 by Jakob Sokatsch, ex collection Stefan Weiß (SAX-1794)