Flint nodule
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Zeolite
Rock cycle 2
Mudstone
Conglomerate
Septarian
Flint
Cave system
Fossils 1
Fossils 2
Fossils 3
Fossils 4
Coal formation
Peat
Lignite
Coal 1
Anthracite
Oil traps
Carnelian
Silver
Agate crystals
Mineraloid
Halite
Manganite
Axinite
MORE...
THUMBNAILS
© Dorling Kindersley 2005
