Online Message

CONTACT US

message-img
  • L162 porphyritic basalt · Igneous Rocks · 1A Collections

    Fine-grained groundmass grew rapidly It is colourless to pale green in thin-section, has moderate relief and two cleavages which intersect at 56°. Rock Name. porphyritic basalt ← L161 amygdaloidal basalt. L172 ultramafic cumulate

    Details >
  • Porphyritic Basalt East Carolina University

    Porphyritic Basalt: Texture: Porphyritic: Origin: Extrusive/Volcanic: Chemical Composition: Mafic: Color: Dark Gray to Black: Mineral Composition: Calcium Plagioclase, Pyroxene: Miscellaneous: Calcium Plagioclase phenocrysts in an aphanitic (Fine-grained) groundmass: Tectonic Environment: Divergent Boundary or Intra-oceanic hot spots

    Details >
  • Porphyritic Wikipedia

    Porphyritic is an adjective used in geology, specifically for igneous rocks, for a rock that has a distinct difference in the size of the crystals, with at least one group of crystals obviously larger than another group. Porphyritic rocks may be aphanites or extrusive rock, with large crystals or phenocrysts floating in a fine-grained groundmass of non-visible crystals, as in a porphyritic basalt, or phanerites or intrusive rock, with individual crystals of the groundmass easily distinguished with the eye, but one group of crystals cl

    Details >
  • Fine-Grained Porphyritic Textures University of Pittsburgh

    2 天前· Porphyritic Textures with Fine-Grained Groundmasses Many rocks with an overall fine-grained texture display scattered minerals that are more than 1 mm across. This porphyritic texture indicates that the magma sat and cooled a bit below the Earth's surface, thus giving time for the large crystals to grow, before erupting onto the surface and cooling very quickly.

    Details >
  • Basalt Rock Formation, Properties, Composition, Uses

    Basalt is rich in iron and magnesium and is mainly composed of olivine, pyroxene, and plagioclase. Most specimens are compact, fine-grained, and glassy. They can also be porphyritic, with phenocrysts of olivine, augite, or plagioclase. Holes left by gas bubbles can give basalt a

    Details >
  • Is basalt porphyritic? Answers

    Like Basalt it is a type of extrusive lava produced by a volcano. It is dark, fine-grained, brown or greyish with an aphanitic to porphyritic texture and of intermediate composition (ranging from

    Details >
  • Porphyry Igneous Rocks

    Rocks are said to be porphyritic if their groundmass is fine-grained ar aphanitic and porphyraceous if their groundmass in visible to the naked eye. Hence, rhyolite and basalt as fine-grained volcanic rocks are porphyritic and granite,syenite,etc. as coarse-grained plutonic rocks are porphyraceous.

    Details >
  • Basalt Rock Properties and Uses Science Struck

    This property is common amongst most dense, fine-grained textured rocks, such as basalt. Density The density of basalt is quite high, which can be seen through the combination of the rocks porosity: 0.1 1%, and its bulk density: 2.8 3 Mg

    Details >
  • Phenocryst & Porphyritic Textures Science Trends

    2017. 8. 16.· A phenocryst is a large crystal that visually stands out compared to the rest of the minerals. Phenocrysts are found in porphyritic textures where large grains are visible in volcanic extrusive rocks. Imagine hiking in Colorado when you come upon a rock with crystals, phenocrysts to be exact, the size of your fist.These phenocrysts are part of a larger porphyritic

    Details >
  • L162 porphyritic basalt · Igneous Rocks · 1A Collections

    Fine-grained groundmass grew rapidly It is colourless to pale green in thin-section, has moderate relief and two cleavages which intersect at 56°. Rock Name. porphyritic basalt ← L161 amygdaloidal basalt. L172 ultramafic cumulate

    Details >
  • Basalt Homestead

    2013. 12. 31.· Basalt. Basalt is a common extrusive volcanic rock. It is usually gray to black and fine-grained due to rapid cooling of lava at the surface of a planet. It may be porphyritic containing larger crystals in a fine matrix, or vesicular, or frothy scoria.

    Details >
  • basalt-porphyry CHC

    Porphyritic felsites and basalts are widely distributed. The porphyritic texture indicates two separate stages of solidification. The porphyritic texture is common in extrusions, e.g., lava. Basalt-porphyry is a porphyry with basaltic chemism.

    Details >
  • Basalt: Fine-Grained Mafic Rock University of Pittsburgh

    2020. 11. 14.· Basalt: Fine-Grained Mafic Rock. Basalts may be entirely fine grained or may show phenocrysts of olivine and/or plagioclase. Basalts also may show vesicular or amygdaloidal textures. This rock displays a fine-grained, porphyritic texture. The

    Details >
  • ABOUT BASALT Mysite

    What is Basalt. Basalt is a common extrusive volcanic rock, usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet; but may be porphyritic, or vesicular, or frothy scoria. Lady King Basalt is porphyritic, containing light colored feldspar crystals in a fine black matrix (see Lady King Basalt photo lower right).

    Details >
  • Potential for CO2 Mineral Carbonation in the Paleogene

    Segamat basalt presents as dark green to black colored outcrops (Figure 2a) and in the field, it is mainly characterized by its fine-grained porphyritic texture. Segamat basalt contains very fine groundmass with visible phenocrysts of light-green colored minerals (Figure 2b).

    Details >
  • Basalt: Igneous Rock Pictures, Definition, Uses & More

    Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, such as a lava flow, but can also form in small intrusive bodies, such as an igneous dike or a thin sill. It has a composition similar to gabbro.

    Details >
  • Is basalt porphyritic? Answers

    Like Basalt it is a type of extrusive lava produced by a volcano. It is dark, fine-grained, brown or greyish with an aphanitic to porphyritic texture and of intermediate composition (ranging from

    Details >
  • Basalt SpringerLink

    Basalt is a fine-grained, dark-colored mafic volcanic rock composed of plagioclase, ortho- or clinopyroxene, and minor Fe-Ti oxides, with or without olivine. Porphyritic samples contain large crystals (phenocrysts) of olivine, pyroxene, or plagioclase dispersed in a fine

    Details >
  • Phenocryst & Porphyritic Textures Science Trends

    Basalt porphyry: A basalt with large and visible grains of calcic plagioclase feldspar, pyroxene, or olivine: Copper porphyry: Copper deposits formed from hydrothermal fluids that travel through fractures of intrusions of magma chambers

    Details >

News & Cases

We provide quality and efficient solutions to our global customers