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Porcellanite

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About PorcellaniteHide

Name:
Etymol: Italian porcellana, porcelain.
A group of siliceous-rocks that have the texture, lustre and conchoidal fracture of porcelain. A dense siliceous rock having the texture, dull luster, hardness, conchoidal fracture, and general appearance of unglazed porcelain; it is less tough, dense, and vitreous than chert.

The term has been used for:
1. an impure chert, in part argillaceous;
2. an indurated or baked clay or shale often found in the roof or floor of a burned-out coal seam, see porcellanite (metamorphic).
and
3. a fine-grained, acidic tuff compacted by secondary silica.

The first definition is most generally used.

Also spelled: porcelanite; porcelainite.

See Also: siliceous shale, Porcelain Jasper, haelleflinta, clinker

The names "porcelain-jasper", "porzellanjaspis", and "basaltjaspis" are inadequate.

Ref: AGI




Classification of PorcellaniteHide

Sub-divisions of PorcellaniteHide

Mineralogy of PorcellaniteHide

Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Silica > OpalSiO2 · nH2O
Silica > Opal-CSiO2 · nH2O
Silica > Opal-CTSiO2 · nH2O
Silica > QuartzSiO2

Synonyms of PorcellaniteHide

References for PorcellaniteHide

Reference List:
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Ernst, W.G. & S.E. Calvert (1969), An experimental study of the recrystallization of porcelanite and its bearing on the origin of some bedded cherts: Amer. Jour. Sci.: 267A: 114-133.
Grapes (2006): Pyrometamorphism. Springer-Verlag, Berlin, Heidelberg

Internet Links for PorcellaniteHide

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