Porcellanite
Sign in to savethumb|right|Porcellanite from the Czech Republic
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- siliceous rock
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- Porcellanite
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- Tievebulliagh
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thumb|right|Porcellanite from the Czech Republic
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.
Excerpted from Wikipedia’s “Porcellanite” article, available under the CC BY-SA 4.0 licence.