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Porcellanite - Wikipedia, the free encyclopedia
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. At Tievebulli...
en.wikipedia.org/wiki/Porcellanite |
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A dense siliceous rock having the texture, dull luster, hardness, conchoidal fracture, and general appearance of unglazed porcelain; it is less hard, dense, ...
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Nov 8, 2009 ... Media in category "Porcellanite". The following 4 files are in this category, out of 4 total. MaloneHoard.JPG 2625380 bytes ...
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Y. Kolodny, Y. Nathan, and E. Sass ... The porcellanite occurs in association with chert in the lower part of the Mishash formation (Cretaceous). It is composed mostly of opal and is highly porous.
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The characteristics of reaction phases, microstructure and microhardness of thermally fused powder mixtures of porcellanite and limestone batched in various ...
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Porcellanite was the single most important raw material used in the manufacture of stone axes in Ireland, accounting for more than half of the total. ...
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The present invention provides high grade opaliform porcellanite having a purity of at least 80% active silica. The invention also provides a process for ...
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Descriptions and examples of Tertiary porcellanite from Northern Bohemia ... Porcellanite is, like the name already suggests a material very similar to porcelain. Basically it is a natural ceramic formed by thermal metamorphism of, mostly kaolinitic, clays.
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Calcareous porcellanite...
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