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  • Basalt

    Basalt

    Basalt (UK: / ˈ b æ s ɒ l t,-ɔː l t,-əl t /; [1] [2] US: / b ə ˈ s ɔː l t, ˈ b eɪ s ɔː l t /) [3] is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in

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  • Basalt Properties, Composition and Formation | Earth Know

    Basalt Properties, Composition and Formation | Earth Know

    2024410;Basalt’s texture is fine-grained or aphanitic. In addition, some basalts can have other textures like porphyritic, vesicular, poikilitic (subophitic or ophitic), or amygdaloidal.

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  • Fine-Grained Porphyritic Textures

    Fine-Grained Porphyritic Textures

    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

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  • Igneous Rocks

    Igneous Rocks

    2024131;Aphanitic: Fine-grained texture due to rapid cooling (typical of volcanic rocks). Basalt is a classic example of an aphanitic igneous rock. The crystals are so small that they are often not visible to the naked eye.

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  • Basalt | Properties, Formation, Composition, Uses

    Basalt | Properties, Formation, Composition, Uses

    Basalt has several textural varieties such as glassy, massive, porphyritic, vesicular, scoriaceous. In the Keweenaw we can subdivide textures into three types, following Huber’s example: Porphyrite, Trap and Ophite, applies ideally

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  • Basalt

    Basalt

    Tholeiitic basalt often represents a fine, glassy groundmass consisting of fine-grained quartz and other main constituent minerals. The tholeiitic basalt has fine-porphyritic texture, which is

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  • Phenocryst

    Phenocryst

    Thus when olivine forms the primary phenocrysts in a basalt, the name may be refined from basalt to porphyritic olivine basalt or olivine phyric basalt. [5] Similarly, shallow intrusives or

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  • Porphyritic basalt

    Porphyritic basalt

    This 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

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  • Chapter 4 Flashcards

    Chapter 4 Flashcards

    Basalt is the aphanitic or fine-grained equivalent of gabbro. olivine. Consider Bowen''s reaction series. Which mineral would you expect to see as a phenocryst in a porphyritic basalt? True.

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  • Porphyritic – Geology is the Way

    Porphyritic – Geology is the Way

    The presence of large crystals in a fine-grained groundmass is commonly regarded to indicate that the phenocrystals crystallized slowly during magma ascent or in a magma chamber, before the crystallization of the surrounding

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  • Basalt | Properties, Formation, Composition, Uses ‣ GEOLOGY HUB

    Basalt | Properties, Formation, Composition, Uses ‣ GEOLOGY HUB

    Fine-Grained (Aphanitic): Most basalt has a fine-grained texture, meaning its mineral grains are too small to be seen with the naked eye. This is due to the rapid cooling of lava at or near the

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  • Uses and How Porphyritic Andesite Rock Form

    Uses and How Porphyritic Andesite Rock Form

    828;Andesite is light to dark grey, bluish-grey, or sometimes a reddish extrusive igneous rock with a fine-grained (aphanitic) to porphyritic texture. It is an intermediate rock

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  • Basalt | Properties, Formation, Composition, Uses ‣ GEOLOGY HUB

    Basalt | Properties, Formation, Composition, Uses ‣ GEOLOGY HUB

    Fine-Grained (Aphanitic): Most basalt has a fine-grained texture, meaning its mineral grains are too small to be seen with the naked eye. This is due to the rapid cooling of lava at or near the

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  • Easiest Explanation of What Porphyritic Basalt Texture Is

    Easiest Explanation of What Porphyritic Basalt Texture Is

    829;Basalt is a fine-grained (aphanitic) dark-colored, mafic extrusive, or volcanic igneous rock. However, it may have a porphyritic texture, and some, like pillow lava basalts, may have a glassy surface with a fine-grained core.

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  • Igneous Rocks | Pictures of Intrusive and Extrusive Rock Types

    Igneous Rocks | Pictures of Intrusive and Extrusive Rock Types

    Basalt is a fine-grained, dark-colored extrusive igneous rock composed mainly of plagioclase and pyroxene. The specimen shown is about two inches (five centimeters) across. Diorite is a

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  • Here Is Everything to Know about Porphyritic Granite Rocks

    Here Is Everything to Know about Porphyritic Granite Rocks

    830;Granite porphyry describes granite rocks with large crystals in a finer-grained matrix but with the same mineralogy and chemistry as ordinary granite rocks. So, porphyry

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  • Basalt Properties, Composition and Formation | Earth Know

    Basalt Properties, Composition and Formation | Earth Know

    2024410;Basalt’s texture is fine-grained or aphanitic. In addition, some basalts can have other textures like porphyritic, vesicular, poikilitic (subophitic or ophitic), or amygdaloidal.

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  • Basalt: characteristics, formation, uses

    Basalt: characteristics, formation, uses

    202414;In some cases, basalt may be porphyritic, containing visible larger crystals (phenocrysts) in a fine-grained matrix. Physical Properties Density: Basalt is heavier than most

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  • Porphyritic Basalt | Geology 1501 | ECU

    Porphyritic Basalt | Geology 1501 | ECU

    Type Igneous Rock Texture Porphyritic Origin Extrusive/Volcanic Chemical Composition Mafic Color Dark Gray to Black Mineral Composition Calcium Plagioclase, Pyroxene Miscellaneous Calcium Plagioclase phenocrysts in an

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  • Basalt

    Basalt

    Tholeiitic basalt often represents a fine, glassy groundmass consisting of fine-grained quartz and other main constituent minerals. The tholeiitic basalt has fine-porphyritic texture, which is

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  • 4.1: Classification of Igneous Rocks

    4.1: Classification of Igneous Rocks

    2024821;Figure \(\PageIndex{2}\): Basalt is a classic fine-grained (aphanitic) extrusive igneous rock. (By James St. John; CC BY 2.0 via Wikimedia Commons.) Some igneous rocks

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  • Basalt

    Basalt

    Basalt is a fine-grained and dark-colored rock. Black color is given to basalt by pyroxene group mineral augite. Width of the sample is 12 cm. but some basaltic rocks are porphyritic (lots of

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  • Basalt Textures

    Basalt Textures

    Porphyrite or porphyritic basalt is characterized by obvious crystals, usually of plagioclase, which is often white or tan in color. These crystals are typically interpreted as phases that formed

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  • Porphyritic Basalt Composition and Uses | Earth Know

    Porphyritic Basalt Composition and Uses | Earth Know

    202457;Porphyritic basalt rocks have large, well-formed grains of calcic plagioclase, augite, olivine, and sometimes hornblende in fine-grained dark-gray to black matrix. The matrix will have mainly calcic plagioclase and augite.

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  • Basalt Rock

    Basalt Rock

    Basalt rocks are mainly composed of pyroxene olivine and plagioclase, these rocks are rich in Magnesium and iron. The most porphyritic minerals in basalt rocks are augite and olivine.

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  • Phenocryst

    Phenocryst

    Thus when olivine forms the primary phenocrysts in a basalt, the name may be refined from basalt to porphyritic olivine basalt or olivine phyric basalt. [5] Similarly, shallow intrusives or

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  • basalt

    basalt

    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

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