Boyd’s Bible Dictionary:
Quartz; abounds in Palestine
(Psa. 114:8). Types abundance (Deut. 32:13); firmness (Isa. 1:7; Ezek. 3:9).
Concise Bible Dictionary:
Flint
1. challamish, “hard rock,” out of which water was brought (Deut. 8:15; Psalm 114:8). Christ, because of His opposers, set His face like a flint, and He knew He should not be ashamed (Isa. 50:7). God made Jacob to suck oil out of the flinty rock (Deut. 32:13).
2. tsor, “rock.” God made Ezekiel's forehead as an adamant, harder than flint, because of the obduracy of Israel (Ezek. 3:9). The horses' hoofs of God's executors of judgment shall be like flint (Isa. 5:28).
Strong’s Dictionary of Hebrew Words:
Meaning:
from 6696; a stone (as if pressed hard or to a point); (by implication, of use) a knife
KJV Usage:
flint, sharp stone