Bible Encyclopedias
Adamant

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

a term vaguely used to describe any very hard stone, and employed in the Auth. Vers. in Ezekiel 3:9; Zechariah 7:12, as the rendering of שָׁמַיר (shamir'), elsewhere (Jeremiah 17:1) rendered DIAMOND (q.v.). Ἀδάμας, Sirach 16:1-30; Sirach 16:1-30, in some copies.

Bibliography Information
McClintock, John. Strong, James. Entry for 'Adamant'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/​encyclopedias/​eng/​tce/​a/adamant.html. Harper & Brothers. New York. 1870.