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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.
Additional recommended knowledge
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.
Categories: Sedimentary rocks | Metamorphic rocks
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Porcellanite". A list of authors is available in Wikipedia.|