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Basalt Fibre - an overview | ScienceDirect Topics

Basalt is a common extrusive volcanic rock, which is usually grey 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. Unweathered basalt is black or grey.

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Basalt Rock | Formation, Properties, Composition, Uses

Basalt is the most common rock on Earth's surface. Specimens are black in color and weather to dark green or brown. 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 ...

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Identifying the Rocks of Lake Michigan (Geode, Septarian ...

Mar 14, 2020· Basalt is a fine-grained, dense volcanic rock, the original rock of Earth's crust. It covers more of Earth's surface than any other rock. It is formed from ancient molten rock that cools quickly when it reaches the surface (called "extrusive type"). ... The review, porphyry or porphyritic rock is made up of a finer-grained rock mass containing ...

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Geologic units containing Basalt - USGS

Dark-gray, fine-grained, dense, porphyritic in part, basalt flows in central and south-central part of State; commonly interbedded with conglomerate, sandstone, and siltstone. Includes small areas of rhyolite north of Cle Elum in Kittitas County, and andesite north of Leavenworth in Chelan County.

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Ophitic Texture - Michigan Technological University

Ta would be coarsely porphyritc Tb would be very fine grained porphyritic and Tc would be Trap. Keweenaw rift rocks include a somewhat rare textural variety of basalt called ophite or ophitic basalt. Ophitic texture is defined inconsistently, but it is an important variety of basalt texture where pyroxene ...

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Mafic - Wikipedia

Mafic is an adjective describing a silicate mineral or igneous rock that is rich in magnesium and iron, and is thus a portmanteau of magnesium and ferric. Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite.Common mafic rocks include basalt, diabase and gabbro.Mafic rocks often also contain calcium-rich varieties of ...

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ALEX STREKEISEN-Basalt-

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 .

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basalt - Meteorite Identification

"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, or vesicular, or frothy scoria. Unweathered basalt is black or gray.

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Basalt - Igneous rocks

Basalt is a major rock type that occurs in virtually every tectonic setting. Basalt is clearly the most common volcanic rock on Earth and basaltic rocks (including gabbro, diabase and their metamorphosed equivalents) are the most common rocks in the crust 2.Basalt is also common on the Moon and other rocky planets of the Solar System.

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basalt - Meteorite Identification

"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, or vesicular, or frothy scoria. Unweathered basalt is black or gray.

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Basalt ~ Learning Geology

Basalt has a fine-grained mineral texture due to the molten rock cooling too quickly for large mineral crystals to grow; it is often porphyritic, containing larger crystals (phenocrysts) formed prior to the extrusion that brought the magma to the surface, embedded in a finer-grained matrix. These phenocrysts usually are of olivine or a calcium ...

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4.1: Classification of Igneous Rocks - Geosciences LibreTexts

Andesite is a fine crystalline intermediate extrusive rock. It is commonly grey and porphyritic. It can be found in the Andes Mountains and in some island arcs (see Chapter 2). It is the fine grained compositional equivalent of diorite. Mafic Composition: Gabbro: Vesicular Basalt

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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 → ...

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Basalt Texture | Color

Glassy, Massive, Porphyritic, Scoriaceous, Vesicular. 1.2 Color. Black, Brown, Light to Dark Grey

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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. Porphyritic structure may appear in any igneous rock, but the true porphyries are rocks in .

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ALEX STREKEISEN-Basalt-

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.

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Porphyritic - Wikipedia

Some basalts are quite glassy (tachylytes), and many are very fine-grained and compact. It is more usual, however, for them to exhibit porphyritic structure, with larger crystals (phenocrysts) of olivine, augite, or feldspar in a finely crystalline matrix (groundmass). Olivine and augite are the most common porphyritic minerals in basalts; porphyritic plagioclase feldspars are also found.

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Properties and Uses of Andesite Rock - Science Struck

It has a porphyritic texture. The term 'porphyritic' means inclusion of large-size crystals in a fine-grained rock. The specific gravity of this rock is 2.5 – 2.8. It generally occurs in the hues of gray. However, it is lighter in color than basalt. It is said to form thicker fluxes or dome-shaped structures.

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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. The term basalt is often casually applied to shallow intrusive rocks with a composition typical of ...

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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. Unweathered basalt is black or gray.

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Geologic units containing Basalt - USGS

Dark-gray, fine-grained, dense, porphyritic in part, basalt flows in central and south-central part of State; commonly interbedded with conglomerate, sandstone, and siltstone. Includes small areas of rhyolite north of Cle Elum in Kittitas County, and andesite north of Leavenworth in Chelan County.

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Porphyritic Basalt – Learning for Kids

Porphyritic Basalt (ORTpb;0). Geologic unit mapped in Oregon: Subaerial lava flows and breccia of porphyritic basalt, minor basaltic andesite, and rare dacite. Includes basalt of Cascade Head (Wells and others, 1983), Yachats Basalt (Snavely and others, 1976c) and .

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Igneous Rock Textures

A hand specimen of basalt with aphanitic (fine grained) texture. The dark color is due to abundant dark colored minerals (pyroxene, hornblende). C) PORPHYRITIC TEXTURE (MIXED FINE AND COARSE) A hand specimen of a volcanic rock with porphyritic texture. Larger crystals of plagioclase feldspar (white), are suspended in a groundmass/matrix of fine ...

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Basalt vs Andesite - Compare Nature

Basalt is a common extrusive igneous rock formed by the rapid cooling of basaltic lava exposed at or very near the surface of Earth. Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava. These rocks are composed of many distinct minerals.

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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.

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Textures of Basalts and Gabbros

Porphyritic or phyric texture - Olivine phenocrysts set in a fine-grained, intergranular matrix. Round clear structures are gas vesicles. Olivine basalt from the DPSP (Deep Sea Drilling Program) Leg 34.

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Fine-Grained Porphyritic Textures

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. The photo below is a close up. The blocky gray and white crystals are feldspar (one K-spar, one plag), and the dark gray, almost ...

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Phenocryst & Porphyritic Textures | Science Trends

Aug 15, 2017· 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 texture that grows under .

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Basalt Porphyry "Flowerstone" | Fred Haynes

Jun 06, 2017· "I believe that most of the "flower" porphyritic rock of Vancouver Island is from the Triassic Karmutsen Fm. There are feldspar porphyries in the older (Devonian) Sicker Gp. rocks, but I've never seen any flower patterns in those. I would call this basalt porphyry because most of the rock is sufficiently fine-grained to be volcanic.

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Coarse-Grained Porphyritic Textures

Porphyritic textures are found in rocks with both coarse- and fine-grained groundmasses. Because larger grains generally indicate longer cooling rates, the phenocrysts indicate that the magma experienced an initial phase of slow cooling deep underground. In rocks with coarse-grained groundmasses, the phase of slow cooling was followed by a ...

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