porphyroblast


porphyroblast
por·phyro·blast

English syllables. 2014.

Look at other dictionaries:

  • Porphyroblast — [ thumb|right|350px|An almandine garnet growing as a porphyroblast in a quartzitic gneiss. This particular garnet measures 3 cm. Location: Paraíba, Brazil.] A porphyroblast is a large mineral crystal in a metamorphic rock which has grown within… …   Wikipedia

  • Porphyroblast — Weiße Andalusit Porphyroblasten in grauer Matrix aus Whitehills (Schottland) Als Porphyroblasten bezeichnet man in der Mineralogie und Petrologie Einschlüsse von größeren Kristallen einer Mineralart in einer feinkörnigeren Matrix aus anderen… …   Deutsch Wikipedia

  • porphyroblast — noun A relatively large crystal within a metamorphic rock …   Wiktionary

  • porphyroblast — …   Useful english dictionary

  • Rock microstructure — includes the texture of a rock and the small scale rock structures. The words texture and microstructure are interchangeable, with the latter preferred in modern geological literature. However, texture is still acceptable because it is a useful… …   Wikipedia

  • Augen — are large, lenticular eye shaped mineral grains or mineral aggregates visible in some foliated metamorphic rocks. In cross section they have the shape of an eye. Feldspar, quartz, and garnet are common minerals which form augen.Augen form in… …   Wikipedia

  • Undulose extinction — is a geological term referring to the type of extinction that occurs in certain minerals when examined in thin section under cross polarized light. As the microscope stage is rotated, individual mineral grains appear black when the polarization… …   Wikipedia

  • Porphyroclast — A porphyroclast is a clast or mineral fragment in a metamorphic rock, surrounded by a groundmass of finer grained crystals. Porphyroclasts are fragments of the original rock before dynamic recrystallisation produced the groundmass. This means… …   Wikipedia

  • Massif Central (geology) — The Massif Central forms together with the Armorican Massif (Brittany and Normandy) one of the two big basement massifs in France. Its geological evolution started in the late Neoproterozoic and continues to this day. It has been shaped mainly by …   Wikipedia

  • Geologie des Zentralmassivs — Die Geologie des Zentralmassivs beginnt im Neoproterozoikum, und seine Entstehungsgeschichte hält bis auf den heutigen Tag an. Das Zentralmassiv (franz. Massif Central) ist mit dem Armorikanischen Massiv eines der beiden großen… …   Deutsch Wikipedia


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