Absolute black granite tile This is a compact homogenous and holocrystalline black coloured dyke rock. It is a very fine-grained rock. It is composed of almost equal proportions of mafic and feldsic minerals. Mafic minerals are less than 0.5 mm in dimensions and are granular in shape. The feldsic mineral is composed of laths and prisms of labradorite. The rock is composed of 50% dark minerals like augite, hornblende, biotite and magnetite and 50% feldspars (labradorite). The feldsic minerals are labradorite. Square shaped pyroxenes of augite are also seen. Porphyroblasts of augite above of 2 mm are also seen. Laths of plagioclase intersertal with augite grains are seen. It is commonly used for decorative materials for tombstones and in memorials, surface plates for installations of heavy and precious instruments, wall linings. It is a hornblende dolerite. The black colour of the rock is mainly due to the masking effect of abundance of black coloured mafic minerals over the feldsic minerals. Hardness 6 Specific 2.9