Cauliflower silicified geodes within Slunfeh Formation of
upper cretaceous were described. Mid-range infrared spectroscopy
FTIR was used for determination of mineral composition of these
geodes. Polarized light microscope was used for the study of
thin
sections taken from inner parts of geodes in order to determine their
crystal habits. The results showed that geodes of studied formation
consists of silicon in form of amorphous to cryptocrystalline opal,
chalcedony of micro-crystalline fibrous radial structure, hexagonal
prismatic quartz, radial quartz, zoned quartz and mosaic quartz.