0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
What does porphyrytic texture indicate about the story of an igneous rock?
it tells you that the igneous rock formed in two stages,stage one occurred deep into the earth were large crystals formed from and then it eruptedas a volcano in stage two were small crystals formed
Which characteristic is common to extrusive igneous rocks?
Igneous rock usually appears with a well mixed texture without fossils, bands or layers, may contain vesicles (air bubbles or holes from trapped gases) and does not react with dilute acid.Igneous rocks can:Be glassy or frothy in appearance.Be felsic, intermediate, mafic, or ultramafic in nature.Be porous or full of bubbles.Have large crystal structure like granites.Have small crystal structure like basalts.Have a combination of large and small interlocked crystals.Be more dense than other rock types.Have an interlocking crystalline structure.Appear to be peppered with black specks.Be light enough to float (pumice).Igneous rocks run the gamut from white to black, glassy to coarse-grained.
Does granite have luster?
Granite is a rock and does not possess one specific luster but a composition of lusters, mostly glassy. It possesses a coarse grained crystalline texture.
What type of rock forms when heat and pressure change one type of rock into another?
Changes in the structure, texture, or mineralogy of existing rocks will create a metamorphic rock. Metamorphism can result from the effects of heat and/or pressure, or from the addition of ions from heated fluids. Examples of metamorphic rock are slate, schist, and gneiss.
What type of rock has little to no grain development and has a vesicular texture?
A rock with little to no grain development and a vesicular texture is typically called a vesicular rock. It is formed from a volcanic eruption, where gases trapped in the lava create bubbles or vesicles. The most common example is vesicular basalt.
What is the difference between an igneous rock with a glassy texture and one with a fine texture?
The main difference is that the glassy textured igneous rock cooled from lava with extreme quickness, while the one with a fine texture cooled less quickly. Obsidian is a natural glass, created by rapidly cooling lava, where mineral crystals do not have enough time to form before the lava solidifies.
How is pumice classified?
Pumice is classified as a felsic, glassy, highly vesicular, extrusive igneous rock.
What is an extrusive igneous rock that is actually glass?
One type of glassy igneous rock is obsidian, which is black and glass-like. Any type of igneous rock that is glassy would be a extrusive rock, which means it was formed outside the earths crust and cooled quickly, making for a fine grain and small crystals. hope this helps
How is the vesicular texture of an igneous rock formed?
A vesicular texture is one where there are small voids within the igneous rock. These tend to form in extrusive igneous rocks due to the loss of confining pressure which causes gasses dissolved in the molten material to come out of solution or exsolve. These gasses form bubbles within the cooling lava and can become trapped if the lava cools rapidly, leaving a permanent gas bubble or void space within the solidified igneous rock.
What does porphyrytic texture indicate about the story of an igneous rock?
it tells you that the igneous rock formed in two stages,stage one occurred deep into the earth were large crystals formed from and then it eruptedas a volcano in stage two were small crystals formed
Which characteristic is common to extrusive igneous rocks?
Igneous rock usually appears with a well mixed texture without fossils, bands or layers, may contain vesicles (air bubbles or holes from trapped gases) and does not react with dilute acid.Igneous rocks can:Be glassy or frothy in appearance.Be felsic, intermediate, mafic, or ultramafic in nature.Be porous or full of bubbles.Have large crystal structure like granites.Have small crystal structure like basalts.Have a combination of large and small interlocked crystals.Be more dense than other rock types.Have an interlocking crystalline structure.Appear to be peppered with black specks.Be light enough to float (pumice).Igneous rocks run the gamut from white to black, glassy to coarse-grained.
Does granite have luster?
Granite is a rock and does not possess one specific luster but a composition of lusters, mostly glassy. It possesses a coarse grained crystalline texture.
What type of rock forms when heat and pressure change one type of rock into another?
Changes in the structure, texture, or mineralogy of existing rocks will create a metamorphic rock. Metamorphism can result from the effects of heat and/or pressure, or from the addition of ions from heated fluids. Examples of metamorphic rock are slate, schist, and gneiss.
A lava flow is an example of an igneous rock one of the two main igneous rock groups?
It is an example of extrusive igneous rock.
What is an igneous rock with both large and small crystals?
The type of igneous rock that has large crystals surrounded by smaller crystals is not a rock but a porphyritic texture. This texture describes igneous rock that has porphyrites, or large crystals, with surrounding tiny particles, or groundmass.
Is porphyritic rock extrusive or intrusive?
A porphyritic igneous rock is one with a texture containing large isolated crystals (phenocrysts) in a mass of fine grained crystals . Porphyritic texture indicates that a magma has gone through a two stage cooling process. The magma has cooled sufficiently underground to allow some minerals to crystallize and grow in size; the magma is then expelled above ground where the remaining liquid magma solidifies quickly, allowing only small crystals to develop.
When Magma is launched from a volcano forms what type of rock?
A volcano is made of extrusive igneous rock. The specific type of igneous rock will vary from one volcano to another.
