Chalkstone literally means “stones of chalk.” The King James Version uses the term to describe the complete destruction of pagan altars in Judah (Isaiah 27:9). Chalk covers many of the hills of Judah and breaks down easily. This makes it a fitting picture of altars being crushed and destroyed.
Bible dictionary
Chalkstone
Adapted by Mission Mutual (Aquifer Open Bible Dictionary) from Tyndale Open Bible Dictionary © 2023 Tyndale House Publishers. CC BY-SA 4.0. About the sources