Basalt Fine Porphyritic

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 …

Porphyritic Textures with Fine-Grained Groundmasses

This is a fine-grained basalt with olivine phenocrysts (pale green blobs). This is an andesite with amphibole (hornblende) phenocrysts. This is a porphyritic rhyolite.

Porphyry - Igneous Rocks

Hence, rhyolite and basalt as fine-grained volcanic rocks are porphyritic and granite, syenite, etc. as coarse-grained plutonic rocks are porphyraceous. Phenocrysts that make up porphyry should be felsic (quartz, feldspar).

What is a porphyritic igneous rock? - Quora

Porphyritic is an adjective used in geology specifically for describing igneous rocks and denotes rock textures typically found in volcanic rocks containing distinct crystals or crystalline particles embedded in a fine-grained groundmass. Most types of igneous rocks will display some degree of porphyritic texture.

Porphyry (geology) - Wikipedia

Rhomb porphyry is a volcanic rock with gray-white large porphyritic rhomb-shaped phenocrysts embedded in a very fine-grained red-brown matrix. The composition of rhomb porphyry places it in the trachyte – latite classification of the QAPF diagram .

Basalt & andesite - Refine Industrial Co.,LIMITED

Basalt is an extrusive igneous rock, sometimes porphyritic, and is often both fine-grained and dense. Basalt in the tops of subaerial lava flows and cinders will often be highly vesiculated, imparting a lightweight "frothy" texture to the rock.

Basalt - an overview | ScienceDirect Topics

Tholeiitic basalt often represents a fine, glassy groundmass consisting of fine-grained quartz and other main constituent minerals. Tholeiitic basalt has fine-porphyritic texture, which is characterized by pyroxene/plagioclase phenocrysts ( Fig. 4.39 ) in fine glassy groundmass.

Porphyritic - YouTube

15.09.2016 · 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 ...

Porphyritic basalt - Dunbar | Virtual Microscope

The basalt is Carboniferous in age with 1-2 mm sized plagioclase phenocrysts and a fine grained groundmass. The thin section shows that plagioclase phenocrysts are mostly altered to sericite, and groundmass contains altered grains of finer-grained plagioclase, altered biotite and altered glass.

Basalt & andesite - Refine Industrial Co.,LIMITED

Basalt is an extrusive igneous rock, sometimes porphyritic, and is often both fine-grained and dense. Basalt in the tops of subaerial lava flows and cinders will often be highly vesiculated, imparting a lightweight "frothy" texture to the rock.

Porphyritic Basalt - PiratePanel

Name: Porphyritic Basalt: Texture: Porphyritic: Origin: Extrusive/Volcanic: stone Composition: Mafic: Color: Dark Gray to Black: Mineral Composition: Calcium ...

Basaltic…? Felsic…? Porphyritic…? Confusion!

22.03.2017 · In the descriptions I have omitted the ever repeated statement “It can be fine grained (aphanitic) to coarse (porphyritic) in texture” – because this is true for almost all the rocks, except for vitrious ones. Also, almost all rocks can be any shade of gray or greenish, but have a yellow to red appearance in other places. This would mostly be due to the inner and outer presence of iron ...

Basalt - Video Learning - WizScience - YouTube

01.09.2015 · Basalt has a fine-grained mineral texture due to the molten rock cooling too quickly for large mineral crystals to grow, although it is often porphyritic, containing the larger crystals formed ...

Basalt: Igneous Rock - Pictures, Definition, Uses & More

What is Basalt? 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.

Mare Basalt, Touchstone - curator.jsc.nasa.gov

Apollo 17 high-Ti basalt”, “fine-grained porphyritic basalt” and “medium dark gray, fine-grained basalt”. Walker et al. (1976) and McGee et al. (1977) noted

Andesite - an overview | ScienceDirect Topics

Tholeiitic basalt often represents a fine, glassy groundmass consisting of fine-grained quartz and other main constituent minerals. Tholeiitic basalt has fine-porphyritic texture, which is characterized by pyroxene/plagioclase phenocrysts ( Fig. 4.39 ) in fine glassy groundmass.

Vesicular and Amygdaloidal Textures - University of Pittsburgh

This hand sample of vesicular basalt has olivine phenocrysts. Like the sample at the top, this one is vesicular, fine-grained, and porphyritic. A close-up appears below. Like the sample at the top, this one is vesicular, fine-grained, and porphyritic.

Mafic Volcanics | SpringerLink

Abstract. Pseudomorph of chlorite + epidote after olivine phenocryst in porphyritic olivine basalt. The fine-grained groundmass shows an intersertal to intergranular texture (230/79-2).

Basalt ~ Learning Geology

Basalt is a fine grained volcanic igneous rock formed of plagioclase and pyroxene minerals. It is most commonly formed by lava flow and in sills and dykes . Basalt is similar to gabbro in composition but the difference lies in the stone size of the two rocks.

Porphyritic Basalt - PiratePanel

Name: Porphyritic Basalt: Texture: Porphyritic: Origin: Extrusive/Volcanic: stone Composition: Mafic: Color: Dark Gray to Black: Mineral Composition: Calcium ...

Basaltic…? Felsic…? Porphyritic…? Confusion!

22.03.2017 · In the descriptions I have omitted the ever repeated statement “It can be fine grained (aphanitic) to coarse (porphyritic) in texture” – because this is true for almost all the rocks, except for vitrious ones. Also, almost all rocks can be any shade of gray or greenish, but have a yellow to red appearance in other places. This would mostly be due to the inner and outer presence of iron ...

Igneous Rock Porphyritic Basalt | Q?rius

Scientists call these specimens, which resemble a chocolate-chip cookie, porphyritic rocks, and the larger crystals are called phenocrysts. The phenocrysts had started to form within the magma before it later cooled rapidly, probably due to that magma erupting at a volcano.

basalt-porphyry - Uni Salzburg

Porphyry is an igneous, volcanic rock composed of large, conspicuous crystals (phenocrysts) and a fine grained to glassy groundmass. Since the term “porphyry” refers only to the texture of the rock and not to its composition, the expression “porphyritic rock” is often used.

Basalt - Homestead

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.

Basalt vs Andesite - rocksparenature

Basalt vs Andesite Characteristics. Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Basalt vs Andesite characteristics assist us to distinguish and recognize rocks.

Types of Porphyritic Rocks - Mineral Processing & Metallurgy

Porphyry. — This name refers to the structure, which is formed of larger crystals set in a fine-grained or glassy ground-mass. The porphyritic structure may be plainly visible, the larger crystals being easily seen (phenocrysts), or it may require the microscope to bring it out.

basalt - INSPIRE

Fine-grained or porphyritic igneous rock with less than 20 percent quartz, and less than 10 percent feldspathoid minerals, in which the ratio of plagioclase to total feldspar is greater 0.65.

What are the differences between basalt and gabbro? - Quora

Gabbro and Basalt have the same stone composition, and often the same or similar mineral composition. The difference is the TEXTURE. Basalt cooled quickly and is therefore fine grained to even glassy, with or without phenocrysts (individual large crystals).

Basalt Picture Gallery - ThoughtCo

Basalt is the most common volcanic rock, constituting nearly all of the oceanic crust and covering parts of the continents. This gallery presents some of basalt's variety, on land and in the ocean.

What are the differences between basalt and gabbro? - Quora

Gabbro and Basalt have the same stone composition, and often the same or similar mineral composition. The difference is the TEXTURE. Basalt cooled quickly and is therefore fine grained to even glassy, with or without phenocrysts (individual large crystals).

Basalt Picture Gallery - ThoughtCo

Basalt is the most common volcanic rock, constituting nearly all of the oceanic crust and covering parts of the continents. This gallery presents some of basalt's variety, on land and in the ocean.

basalt - INSPIRE

Fine-grained or porphyritic igneous rock with less than 20 percent quartz, and less than 10 percent feldspathoid minerals, in which the ratio of plagioclase to total feldspar is greater 0.65.

ALEX STREKEISEN-Basalt-

A basalt is a fine-grained basic igneous rock containing essential calcic plagioclase feldspar and pyroxene (usually Augite), with or without olivine. Basalts can also contain quartz, hornblende, biotite, hypersthene (an orthopyroxene) and feldspathoids. Basalts are often porphyritic and can contain mantle xenoliths. As basic rocks they contain between 45-50% silica, abundant Fe, Mg and Ca ...

Basalt rock - ScienceDaily

Basalt is a common gray to black volcanic rock. It is usually fine-grained due to rapid cooling of lava on the Earth's surface. It may be porphyritic containing larger crystals in a fine matrix ...

Mafic | Wiki | Everipedia

Rock texture Name of mafic rock Pegmatitic Gabbro pegmatite Coarse grained ( phaneritic) Gabbro Coarse grained and porphyritic Porphyritic gabbro Medium grained Diabase or Dolerite, Microgabbro Fine grained ( aphanitic) Basalt Fine grained and porphyritic Porphyritic basalt Pyroclastic Basalt tuff or breccia Vesicular Vesicular basalt Amygdaloidal Amygdaloidal basalt Many small vesicles Scoria ...

Mare Basalt, Touchstone - Welcome to NASA Headquarters

Apollo 17 high-Ti basalt”, “fine-grained porphyritic basalt” and “medium dark gray, fine-grained basalt”. Walker et al. (1976) and McGee et al. (1977) noted

PORPHYRITIC - Definition and synonyms of porphyritic in ...

Porphyritic rocks may be aphanites or extrusive, with large crystals or phenocrysts floating in a fine-grained groundmass of non-visible crystals, as in a porphyritic basalt, or phanerites or intrusive, with individual crystals of the groundmass may be easily distinguished with the eye, but one group of crystals clearly much bigger than the rest, as in a porphyritic granite. Most types of ...

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 …

Science Ch. 5 Flashcards | Quizlet

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