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Earthlearningidea Virtual Rock Kit

all rocks index      igneous rocks index

Basalt is a dark-coloured igneous rock with fine-grained (too small to be seen) interlocking crystals and often with gas holes.
Dark-coloured crystals are usually rich in iron and magnesium.

Hand specimen


Hand specimen

Locality

Rock in use

Close-up

Thin section p-polars

Thin section x-polars