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set: volcanoes // series: caldera // picture:
A thin section of a basalt lava flow. After the sample of lava has been sliced thinly on a diamond-tipped cutting wheel and mounted on a glass slide it looks like this when viewed under a petrological microscope. The golden yellow-pale yellow minerals are clinopyroxene which are approximately 1mm across, the oblong mineral with grey, black and white stripes is plagioclase feldspar. These two minerals are always found in basalt. The partial inclusion of the plagioclase by the clinopyroxene is typical of basalts which have cooled fairly slowly, and is known as sub-ophitic texture