51.5 MB (2.2 MB compressed)
5197 x 3465 pixels
43.9 x 29.5 cm ⏐ 17.3 x 11.6 in (300dpi)
DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Opal in its host rock. Opals are a form of hydrated silica glass. They are not truly crystalline, and are classified as mineraloids. Here the opal has taken on a botryoidal (grape-like) form and lacks the colour and lustre of the precious forms used in jewellery. This specimen is from Lolling, near Huttenberg, Austria.
Model release not required. Property release not available.