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porcellanite : ウィキペディア英語版 | porcellanite
Porcellanite or ''porcelanite'', is a hard, dense rock somewhat similar in appearance to unglazed porcelain. It is often an impure variety of chert containing clay and calcareous matter.〔(Porcellanite, Encyclopædia Britannica Premium Service )〕 At Tievebulliagh, Northern Ireland, porcellanite is a tough contact metamorphosed hornfels formed from a lateritic soil horizon within a basaltic intrusive/extrusive sequence. It is the site of a Neolithic axe or stone tool quarry.〔(Tievebulliagh )〕 == References ==
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