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Basalt Fine Porphyritic

Basalt Fine Porphyritic

  • L162 porphyritic basalt · Igneous Rocks · 1A Collections

    Finegrained groundmass grew rapidly It is colourless to pale green in thinsection, has moderate relief and two cleavages which intersect at 56° Rock Name porphyritic basalt ← L161 amygdaloidal basalt L172 ultramafic cumulate →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 (Finegrained) groundmass: Tectonic Environment: Divergent Boundary or Intraoceanic hot spotsPorphyritic BasaltApr 10, 2018· 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, finegrained, and glassy They can also be porphyritic, with phenocrysts of olivine, augite, orBasalt Rock | Formation, Properties, Composition, Uses

  • FineGrained Porphyritic Textures

    This is a finegrained 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 Kspar, one plag), and the dark gray, almostThis altered porphyritic basalt sample is from The Battery, a ruined gun emplacement built towards the end of the 1700s during the American War of Independence, at the entrance to Old Harbour at Dunbar It became disused by the middle 1800s and was subsequently reused as a hospitalPorphyritic basalt Dunbar Virtual MicroscopeFeb 26, 2012· 113 – Porphyritic Basalt (Igneous Rock), Texture: Porphyritic Aphanitic, Formation: Intrusive then Extrusive, Composition: Mafic (Dark), Description: Basalt with large PhenocrystsPORPHYRITIC BASALT | 113 – Porphyritic Basalt (Igneous

  • 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 finegrained to be volcanicMany rocks with an overall finegrained 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 The large crystals are termed phenocrysts while the aphanitic rest of rock isFineGrained Porphyritic TexturesSome basalts are quite glassy (tachylytes), and many are very finegrained 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; porphyriticbasalt | Definition, Properties, & Facts | Britannica

  • 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 finegrained to be volcanicFeb 26, 2012· 113 – Porphyritic Basalt (Igneous Rock), Texture: Porphyritic Aphanitic, Formation: Intrusive then Extrusive, Composition: Mafic (Dark), Description: Basalt with large PhenocrystsPORPHYRITIC BASALT | 113 – Porphyritic Basalt (IgneousJan 15, 2020· 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, finegrained, brown or greyish intermediate volcanic rock which is a commonly found in lavaWhat is porphyritic andesite?

  • Is basalt porphyritic? Answers

    Like Basalt it is a type of extrusive lava produced by a volcano It is dark, finegrained, brown or greyish with an aphanitic to porphyritic texture and of intermediate composition (ranging fromIf a rock falls in one of the above categories on the chart but is porphyritic (visible crystals in a fine grained groundmass or matrix) it is given a compound name, for example, granite porphyry (or porphyritic granite), and basalt porphyry (or porphyritic basalt) For more information see the Geology of Michigan, 1991; Dorr & EschmanMETAMORPHIC ROCK CHART MichiganFine grained and porphyritic (Mafic) porphyritic basalt Fine grained and vesicular (Felsic) NONE Fine grained and vesicular (Intermediate) Vesicular andesite Fine grained and vesicular (Mafic) Vesicular basalt Pyroclastic (Felsic) Rhyolite tuff or breccia (shown) Pyroclastic (Intermediate)Geology Igneous Rock Types Flashcards | Quizlet

  • Basalt an overview | ScienceDirect Topics

    Tholeiitic basalt often represents a fine, glassy groundmass consisting of finegrained quartz and other main constituent minerals The tholeiitic basalt has fineporphyritic texture, which is characterized by pyroxene and plagioclase phenocrysts (Fig 539) in fine glassy groundmassPorphyritic felsites and basalts are widely distributed The porphyritic texture indicates two separate stages of solidification The porphyritic texture is common in extrusions, eg, lava Basaltporphyry is a porphyry with basaltic chemismbasaltporphyryBasalt is a common extrusive volcanic rock, which is usually grey to black and finegrained 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 greyBasalt Fibre an overview | ScienceDirect Topics

  • ABOUT BASALT | Mysite

    Basalt is a common extrusive volcanic rock, usually grey to black and finegrained 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"Basalt is a common gray to black volcanic rock It is usually finegrained 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 graybasalt Meteorite IdentificationBasalt A basalt is a finegrained 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 porphyriticALEX STREKEISENBasalt

  • Mare Basalt, Touchstone

    finegrained porphyritic mare basalt that has been used to create “touchstones” for public display (see list under Processing) It was collected about 60 m from the Lunar Module and is one of the largest stones returned from the Moon Neal and Taylor (1993) catalogued 70215 as a “highTi, Mare Basalt” and it contains an abundance ofThis property is common amongst most dense, finegrained textured rocks, such as basalt Density The density of basalt is quite high, which can be seen through the combination of the rocks porosity: 01 – 1%, and its bulk density: 28 – 3 Mg (megagram) per m 3, This is because, around 50 percent of basaltBasalt Rock Properties and Uses Science StruckDarkgray, finegrained, dense, porphyritic in part, basalt flows in central and southcentral 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 CountyGeologic units containing Basalt USGS

  • METAMORPHIC ROCK CHART Michigan

    If a rock falls in one of the above categories on the chart but is porphyritic (visible crystals in a fine grained groundmass or matrix) it is given a compound name, for example, granite porphyry (or porphyritic granite), and basalt porphyry (or porphyritic basalt) For more information see the Geology of Michigan, 1991; Dorr & EschmanPorphyry — This name refers to the structure, which is formed of larger crystals set in a finegrained or glassy groundmass 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 which there is a markedTypes of Porphyritic Rocks Mineral Processing & MetallurgyBasalt 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 2Basalt is also common on the Moon and other rocky planets of the Solar SystemBasalt Igneous rocks

  • Basalt vs Porphyry 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 Porphyry is a reddishbrown to purple igneous rock containing large phenocrysts of various minerals embedded in a finegrained matrixFind out what the main characteristics of a basalt are, and how you can find themHow to classify a rock: basaltd porphyritic 9 Rhyolite is the finegrained equivalent of this igneous rock a basalt b andesite c granite d diorite 10 Select the coarsegrained rock which is composed mainly of quartz and potassium feldspar from the list below a basaltch2 practice test

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