鹵石 is read as ろせき (roseki) and means halide.
ろせき
roseki
じせき
compass
かせき
fossil
ほうせき
gem
ぼせき
tombstone
こいし
pebble
こうせき
ore
でんじしゃく
electromagnet
そせき
foundation stone
こく
measure of a Japanese-style boat's loading capacity (approx. 278.26 liters)
さいせき
crushing (rock)
いっせき
one game (of go)
どせき
earth and stones