Basalt is a volcanic igneous rock of dark color, composition-rich mafic silicates of magnesium and iron and low silica content. The basalts usually have a porphyritic texture, with phenocrysts of olivine, augite and plagioclase and a fine crystalline matrix.
SIZE -------------------- THICKNESS
60X30 cm - 24"X11" ---- 1 cm
60X40 cm - 24"X15"---- 1 cm
30X30 cm - 11"X11"---- 1 cm
40X40 cm - 15"X15"---- 1 cm
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