Black galaxy granite is in the gabbro family of stone material and is sourced in the Ongole area of South India. The granite material is rated a 4.5 on the Moh’s scale of hardness, which is considered relatively hard.Black Galaxy Granite is mostly black with small gold or white flecks granite quarried in India. Known for its beautiful look and striking finish, Black Galaxy Granite is well known for its stain-free merits. Its name flawlessly describes this stone, as its golden flecks are suggestive of an ever-expansive galaxy.