火石(Flint[1])係一種沉積岩

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香港東平洲新近紀形成嘅燧石層,因為比較硬而凸出
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一嚿火石

佢主要由矽藻底沉積而成,所以主要成份係二氧化矽。因為噉,佢質硬,可以用來擦出

大清時,火石喺歐洲[1]。打火時會放喺特制嘅盒(en:tinderbox),或者喺玻璃品之內[1]

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