Their most notorious act was the abduction, in 930 (AH 317), of the Black Stone, refusing offers to ransom it. They threw it back into the mosque in Kufah in 951 (AH 340), saying, ‘By command we took it, and by command we return it’—now in seven pieces, perhaps to affirm the seven Imāms? Although they disappeared as a sect, their influence continued in other movements, e.g. perhaps the Alawis (see NUṢAIRI).
"Qarmatians." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. (August 15, 2018). http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/qarmatians
"Qarmatians." The Concise Oxford Dictionary of World Religions. . Retrieved August 15, 2018 from Encyclopedia.com: http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/qarmatians