Verse 12. "Made their hearts as an adamant stone" - rym shamir may mean the granite. This is the hardest stone with which the common people could be acquainted. Perhaps the corundum, of which emery is a species, may be intended. Bochart thinks it means a stone used in polishing others.
The same name, in Hebrew, applies to different stones.
Verse 14. "I scattered them with a whirlwind" - This refers to the swift victories and cruel conduct of the Chaldeans towards the Jews; they came upon them like a whirlwind; they were tossed to and fro, and up and down, everywhere scattered and confounded.