he Kaaba is a large masonry structure roughly the shape of a cube. It is made of granite from the hills near Mecca, and stands upon a 25 cm (10 in) marble base, which projects outwards about 30 cm (1 foot).[2] Approximations for the structural dimensions are: 13.10 m (42.98 ft) high, with sides measuring 11.03 m (36.19 ft) by 12.62 m (41.40 ft).[3][4] The four corners of the Kaaba roughly face the four points of the compass.[2] In the eastern corner of the Kaaba is the Ruknu l-Aswad “Black Stone” or al-Ħajaru l-Aswad, generally thought to be a meteorite remnant; at the northern corner is the Ruknu l-ˤĪrāqÄ« “The Iraqi corner”, at the western lies Ruknu sh-ShāmÄ« “the Levantine corner” and at the southern Ruknu l-YamanÄ« “the Yemeni corner”.[2][4]
-he Black Stone is a significant feature of the Kaaba, believed by Muslims to date back to the time of Adam and Eve.[7] Located on the eastern corner of the Kaaba, it is about 30 cm (12 inches) in diameter and surrounded by a silver frame. Hajj pilgrims often attempt to kiss the Stone as Muhammad once did.[8] Because of the large crowds, this is not always possible, and so as pilgrims walk around the Kaaba, they are to point to the Stone on each circuit.[9]

Tradition has it that the Black Stone was white when it came to Earth, subsequently turning black under the burden of humanity’s sins.[10]

en.wikipedia.org/wiki/Kaaba