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Minerals recoverable by dissolution

A hollow cylinder or tube like underground formation of solid lava

A volcanic bomb is a chunk of ejected viscous lava larger than a lapilli, being over 64 mm.

Molten volcanic rock, still in a hot viscous state and not yet solid

The crust and upper mantle of the Earth from its lithosphere

Straight line cut through terrain for the purpose of geophysical mapping of the area

A hydrous form of iron oxide

A sedimentary rock type made of calcium carbonate.

Calcium oxide, CaO or powdered calcium carbonate, CaCO

A green form of titanite