What is the dominant feldspar in Basalt?
What is the dominant feldspar in basalt? Plagioclase.
What texture would you expect to find in a basalt erupted from a volcano in Hawaii?
Most lava crystallizes to form igneous rocks with phaneritic textures. Pegmatites are smaller volume intrusive bodies with glassy textures. Basalt is the aphanitic or fine-grained equivalent of gabbro.
What is phaneritic and aphanitic?
APHANITIC TEXTURE – Igneous rocks that form on the earth’s surface have very fine-grained texture because the crystals are too small to see without magnification. PHANERITIC TEXTURE – Igneous rocks with large visible crystals because the rock formed slowly in an underground magma chamber.
What is a volcanic rock that is extremely vesicular and glassy?
| TEXTURE | Felsic | Ultramafic |
|---|---|---|
| Phaneritic | Granite | Peridotite |
| Aphanitic | Rhyolite | |
| Vesicular | Pumice | |
| Glassy | Obsidian |
What is basaltic lava?
Is lava rock a basalt?
How is basaltic magma formed?
What texture is basalt?
| Type | Igneous Rock |
|---|---|
| Texture | Porphyritic |
| Origin | Extrusive/Volcanic |
| Chemical Composition | Mafic |
| Color | Dark Gray to Black |
What is the hardness of basalt rock?
The rock hardness of basalt is 6 as per the Mohs scale and can be observed through a combination of its compressive strength. Generally 100-300 Mpa or Megapascal is the compressive strength.
Is Obsidian a phaneritic?
The result is a natural amorphous glass with few or no crystals. Examples include obsidian. … The minerals in a phaneritic igneous rock are sufficiently large to see each individual crystal with the naked eye. Examples of phaneritic igneous rocks are gabbro diorite and granite.
Which igneous rock is aphanitic?
What is the difference between phaneritic and porphyritic rocks?
Phaneritic: any coarse-grained igneous rock often intrusive usually formed as a result of a longer cooling history (ex. granite gabbro). Porphyritic: an igneous rock with one mineral (called the phenocryst) exhibiting a grain size larger than the remainder of the minerals (called the groundmass).
What rock is glassy?
Which rock is a vesicular texture?
Which rock type has highly vesicular texture?
Vesicular texture — basalt scoria: This is an extrusive igneous rock that chilled very quickly so that the bubbles (vesicles) formed by escaping gas were preserved.
What is the dominant lava type erupted along mid ocean ridges?
Mid-Ocean Ridge Magmatism: By far the dominant type of lava resulting from magmatic activity at mid-ocean ridges is basalt also called mid-ocean ridge basalt (MORB). However small amounts of other extrusive magma types (predominantly andesite dacite and picrite) also erupt there.
What kind of eruption is produced when basaltic lava flows from a volcano?
Fissure eruptions occur along elongated cracks in Earth’s surface rather than from a single vent or pipe. Magma wells up through the crack and pours out on either side in effusive eruptions. These eruptions form extensive sheets of basaltic lava.
What volcanoes have basaltic lava?
Most shield volcanoes are formed from fluid basaltic lava flows. Mauna Kea and Mauna Loa are shield volcanoes. They are the world’s largest active volcanoes rising over 9 km above the sea floor around the island of Hawai’i.
Does obsidian exist?
Is lava a crystal?
Lava is made up of crystals volcanic glass and bubbles (volcanic gases). As magma gets closer to the surface and cools it begins to crystallize minerals like olivine and form bubbles of volcanic gases. When lava erupts it is made up of a slush of crystals liquid and bubbles.
Does lava rock bring bad luck?
Legend also has it that if you take any of the natural minerals including lava rock sand or dirt from where Pele placed it she will curse you bringing you bad luck and misfortune not long after removing what she considers hers from the island.
What type of volcano has basaltic magma?
What is basaltic and granitic magma?
One major difference between basaltic and granitic magma is their specific mineral contents. Basaltic magma contains between 45 and 55 percent silicon dioxide and is high in magnesium iron and calcium while granitic magma contains between 65 and 75 percent silicon dioxide and only small amounts of those minerals.
What happens once basaltic magma is formed?
Basaltic magma is usually very dense and gets stopped in the continental crust rather than reaching the surface causing it to crystallize. This crystallization releases the basaltic magma’s heat causing the temperature of the continental crust to rise and melt.
Is slate a rock?
What type of rock is obsidian?
What is the texture of obsidian?
| Type | Igneous Rock |
|---|---|
| Texture | Glassy |
| Origin | Extrusive/Volcanic |
| Chemical Composition | Felsic |
| Color | Reddish Brown mottled with black |
Can sandstone scratch glass?
…
Sedimentary Rocks.
| Formation | Characteristic | Rock Name |
|---|---|---|
| chemicals | scratches glass conchoidal fracture like flint | Chert |
What hardness is Slate?
between 2.5 to 4
Slate is considered to be in between 2.5 to 4 on this scale in terms of hardness which means that it is on average almost as hard as marble and limestone but not as hard as granite or natural quartz.
What type of rock is pumice?
Is quartz an Aphanitic?
Aphanites are commonly porphyritic having large crystals embedded in the fine groundmass or matrix. … They consist essentially of very small crystals of minerals such as plagioclase feldspar with hornblende or augite and may contain also biotite quartz and orthoclase.
Is glassy a texture?
What is fragmental texture?
A texture of sedimentary rocks characterized by broken abraded or irregular particles in surface contact and resulting from the physical transport and deposition of such particles the texture of a clastic rock. The term is used in distinction to a crystalline texture.
What are the 4 types of igneous rocks?
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