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Figure 3: Thin sections of the gabbro from the Northern dyke and dolerite from the Southern dyke (axe quarry) of Hiregudda (Photographs by David Gómez-Gras). A) general view of the intergranular texture of the gabbro rock containing crystals of augite(green) and plagioclase (light) under plane polarized light (PPL) and B) under crossed polars (PPX). C (PPL) and D (PPX) images of the microcrystalline intergranular texture in dolerite rock. E (PPL) and F (PPX) enhanced images showing augite crystals (red, blue and orange colours) occupying the spaces between plagioclase laths (grey).