"I have not seen Allah's Apostle touching except the
two Yemenite corners....." (Book #72, Hadith #742)
What "two Yemenite corners" do you suppose that would be referring to?
".....So the Prophet ordered his companions to do Ramal (i.e. fast walking) in the first three rounds of Tawaf around the Ka'ba and to walk in
between the two corners (i.e. the black stone and the Yemenite corner)". (Book #59, Hadith #557)
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https://justislam.wordpress.com/2008/02/29/station-of-abraham-and-zamzam-well/Station of Abraham and Zamzam Well
Station of Ibraheem (Abraham)
The Prophet said:
‘The Yemeni corner and Station of Ibraheem are
two precious stones from Jannah (Heavenly Gardens), and had it not been that Allah removed their light, they would have enlightened all that was between the east and the west.’ (Ibn Hibban)
The Station of Ibraheem is the rock upon which Ibraheem stood while erecting the Kabah. His son Ishmael helped him erect it, by passing him the rocks.