滑石 is read as かっせき (kasseki) and means talc.
かっせき
kasseki
かっせきこ
talcum powder
すべらか
continuously differentiable
ぬめり
slime
すべる
to fail (an examination)
こっけい
ridiculous
すべりだい
(playground) slide
かっそう
taxiing
かっそうろ
runway
かっこう
downhill (race)
すべりだす
to make a start
すべりこむ
to slide into
かつらく
sliding down (a slope, mountainside)