Photograph of face 1 of stone axe (ISAP 03108) from Errity, Co. Donegal, from the National Museum of Ireland (NMI 1930:30). Macro-ID - Porcellanite. Micro-ID - Porcellanite Ia. Petrology - Grey coarse nodular streaked lineated, mottled. Description - Sides - Both irregularly flattened. Left side broader than the right. One to two small shallow remnant flake scars on both sides, centre and towards butt. Edge - Worn and blunted. Minor to moderate chipping over entire length, concentrated in centre, on both faces. Slightly sinuous in profile. Blade Area - Distinct wear pattern over the blade area, both faces. Faces - Both flattened along centre. Moderate level of polish. Single large shallow remnant flake scars, Face 1 adjacent to the right side upper portion, Face 2 adjacent to the left side centre. Overall high degree level of surface regularity. Butt - Original, heavy chip damage Face 2 centre, and right side. Core taken from lower portion of Face 1. Dimensions (length x width x thickness) - 12.7 cm, 6 cm, 2.7 cm, 298g.