Cf. in general E.S. Hartland et al., “Stones,” in Encyclopaedia of Religion and Ethics, ed. J. Hastings (New York: Scribner’s; Edinburgh: T & T Clark, 1921), vol. 11, pp. 864–881; C.M. Edsman, “Stones,” in The Encyclopedia of Religion, ed. Mircea Eliade (New York: Macmillan, 1987), vol. 14, pp. 49–55.