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Basalt - close-up
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Thin section
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Hand specimen
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Thin section x-polars
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Close-up
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Exposure
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Rock in use
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Basalt – dark-coloured, fine-grained (too small to be seen) interlocking crystals (dark-coloured crystals are usually rich in iron/magnesium) – a fine-grained, dark-coloured, iron/magnesium-rich igneous rock, often with gas holes
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