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Rock Index
Mineral Index
Agglomerate, Ercall quarry.
An introduction. Rock specimens.
Breccia, Hafren forest.
Concretion, cone-in-cone var.
Concretion, Dolfor, type one.
Concretion, Trefeglwys.
Conglomerate, Ercall quarry.
Garnet-pyroxene-gneiss.
Granophyre, Ercall quarry.
Hydrothermal Breccia.
Lamprophyre, Maddock's hill quarry.
My Rock
Obsidian. Mexico.
Orbicular Rhyolite. Chihuahua,Mexico.
Sandstone nodules.( concretions ).
Wave ripple marks. Penarth.