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What is amphibolite made of?
Amphibolite is a type of metamorphosed mafic igneous rock. It is composed largely of minerals such as hornblende and plagioclase.
A certain igneous rock contains about 25 percent dark silicate minerals The remainder of the rock is mostly plagioclase feldspar What type of composition does tthis igneous rock have?
ultramafic
Would quartz or plagioclase be more likely to form well-shaped crystal in an igneous rock?
Plagioclase.
An igneous rock that contains mostly plagioclase feldspar and about 30 percent dark silicate minerals has a composition that is?
An igneous rock that contains mostly plagioclase feldspar and about 30 percent dark silicate minerals is classified as a basaltic or mafic rock. This composition typically indicates a formation from a relatively high-temperature magma that is rich in iron and magnesium. The presence of plagioclase feldspar suggests a significant amount of sodium and calcium in the rock's mineral makeup. Overall, this rock type is commonly associated with volcanic activity and can be found in oceanic crust.
Dark fine grainmed volcanic rock consisting of plagioclase feldspar?
andesite
Dacite is what type of?
Dacite is a type of volcanic igneous rock that falls under the intermediate composition category. It is formed from the solidification of lava rich in silica and typically contains plagioclase feldspar and quartz minerals. Dacite is known for its porphyritic texture, showing large crystals (phenocrysts) embedded in a fine-grained groundmass.
What type of composition does an igneous rock have that contains mostly plagioclase feldspar and about 30 percent dark silicate minerals?
The igneous rock with mostly plagioclase feldspar and about 30 percent dark silicate minerals is likely a basalt. Basalt is a fine-grained extrusive rock that is commonly found in oceanic crust and volcanic islands. The dark silicate minerals in basalt are typically pyroxene and olivine.
Is a granite a rock or a mineral?
Granite is an igneous rock. It is commonly formed from the following minerals. Quartz, potassium and Plagioclase Feldspars and Biotite Mica.
What is a type of mafic phaneritic rock?
Gabbro is a type of mafic phaneritic rock. It is composed mainly of pyroxene, plagioclase feldspar, and often contains minor amounts of amphibole, olivine, or biotite. Gabbro forms from the slow crystallization of mafic magma deep within the Earth's crust.
Is diorite a rock?
Yes, diorite is a type of rock. It is a granular igneous rock that is commonly found in mountain ranges and other geologically active areas. Diorite is composed mainly of plagioclase feldspar, biotite, hornblende, and other minerals.
What type of rock is hornblende diorite?
Hornblende diorite is a type of intrusive igneous rock. It is composed primarily of plagioclase feldspar, hornblende, and small amounts of other minerals. It has a medium to coarse-grained texture and is typically gray or greenish in color.
How can someone identify quartz in an igneous rock from plagioclase?
quartz will have conchidal fracture...plagioclase will have 2 sets of cleavage near 90 degrees and some striations quartz will have conchidal fracture...plagioclase will have 2 sets of cleavage near 90 degrees and some striations
