Basalt is a dark-coloured igneous rock with fine-grained (too small to be seen) interlocking crystals and often with gas holes.
Locality - Isle of Staffa, Scotland
GNU free documentation licence, taken by Hartmut Josi Bennohr
Hand specimen |
Locality |
Rock in use |
Close-up |
Thin section p-polars |
Thin section x-polars |