This page deals with the genesis of rhyolitic spherulites which contain agate/macroquartz and other minerals hosted within the marginal facies of Lower Permian rhyolitic volcanics of the Thuringian Forest, Germany.
Captions to images of specimens which illustrate the page you will find at figures. All rights are reserved to Gerhard Holzhey, and no image shall be reproduced in any medium, for any reason, without written permission.
