porcellanite


porcellanite
   A dense, siliceous rock formed as a indurated or baked clay or shale with a dull, light-colored, cherty appearance, often found in the roof or floor of a burned-out coal seam.
   GG

Glossary of landform and geologic terms. 2013.

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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. [Porcellanite, Encyclopædia Britannica Premium Service.… …   Wikipedia

  • porcellanite — ▪ rock also spelled  porcelanite        hard, dense rock that takes its name from its resemblance to unglazed porcelain. Frequently porcellanite is an impure variety of chert containing clay and calcareous matter; when of this nature it is… …   Universalium

  • porcellanite — (por sèl la ni t ) s. f. Terme de minéralogie. Espèce de jaspe …   Dictionnaire de la Langue Française d'Émile Littré

  • porcellanite — por·cel·la·nite …   English syllables

  • porcellanite — ˈ ̷ ̷s(ə)ləˌnīt noun ( s) Etymology: German porzellanit, from porzellan porcelain (from Italian porcellana) + it ite : a hard dense siliceous rock having the appearance of unglazed porcelain on fresh fractures …   Useful english dictionary

  • Tievebulliagh — (Taobh Builleach) Tievebulliagh, May 2007. Fragments of porcellanite can be seen among the dolerite in the scree. Elevation …   Wikipedia

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  • Felsic — is a term used in geology to refer to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. The term combines the words feldspar and silica. Felsic minerals are… …   Wikipedia

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