%0 Journal Article
%T Orbicular granite near Jelenia G¨®ra in southwestern Poland: the first outcrops?
%A P¨¢dhraig S. Kennan
%A Marek W. Lorenc
%J Mineralogia
%@ 1899-8526
%D 2008
%I 
%R 10.2478/v10002-008-0006-4
%X In 1802, Leopold von Buch described some outcrops of orbicular granite in the Karkonosze granite, Lower Silesia, Poland. In that publication, Abraham Gottlieb Werner wrote a foreword dated 1800. The Silesian discovery predates that of the well-known orbicular diorite (Napoleonite) in outcrop on Corsica and, thus, may be the first ever record of this distinctive rock type in its geological context. The characterizing, closely-packed, simple orbs comprise K-feldspar cores surrounded by rims of radiating K-feldspar and quartz. Rapid growth from a hydrous, pegmatitic melt is indicated. The Karkonosze outcrop, in the timing of its discovery, is a unique part of the geological heritage.
%K orbicular granite
%K Leopold von Buch
%K Karkonosze granite
%K Lower Silesia
%K Napoleonite
%U http://versita.metapress.com/content/w3761777m8j4p234/?p=9d5669e479104867b39469480559df8d&pi=0