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What is another term for a texture where the crystals are not visible to the unaided eye?
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Which metamorphic rock will have visible mica crystals and a foliated texture?
quartzite
What is the texture of granit?
Granite has a phaneritic texture. This means that it has crystals 1-10 mm. It was formed from slow cooling, viscous magma, and/or good nucleation. Crystalline. Coarse-grained. Crystals visible without magnification.
How are igneous rocks named based on composition and texture?
Texture: Aphanitic -- small crystals, invisible without magnification Porphyritic -- visible crystals amid a fine-grained groundmass Phaneritic -- large visible crystals Composition: Felsic -- more than 65% silica Intermediate -- between 55-65% silica Mafic -- between 45-55% silica Ultramafic -- less than 45% silica
Large bundles of axons and dendrites visible to the unaided eye are?
Nerves
What is a porphyritic texture?
A porphyritic texture is displayed in an igneous rock containing large isolated crystals (phenocrysts) in a mass of fine textured 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.See link below for a picture of a porphyritic texture in a rock.
What are rocks that have visible crystals in them classified as?
Rocks with easily visible mineral crystals are called macrocrystalline or said to possess a phaneritic texture.
Which metamorphic rock will have visible mica crystals and a foliated texture?
quartzite
What is a term that describes an igneous rock texture in which crystals are present but are not visible?
extrusive
Rocks with visible crystals display what is known as a phaneritic 'blank'?
The display a phaneritic texture.
What is a rock's texture?
The texture of a rock consists of it's grain or mineral crystal size, the arrangement of the grains or crystals, and the degree of uniformity of the grains or crystals. Examples of rock texture would be: * Coarse grained--visible crystals or grains as in granite. * Fine grained--small grains, invisible to the unaided eye as in shale. * Porphyritic--large visible crystals in a fine grained matrix as in granite porphyry. * Schistose--layers of flattened micaceous minerals such as in mica schist. * Foliated--a metamorphic rock texture of parallel mineral banding as in gneiss. * Homogenous--same grain apperance in all directions as in basalt.
What is no visible grain?
'No visible grain' refers to a rock's texture, and the inability to distinguish individual particles or crystals by simple observation without magnification.
What is the texture of granit?
Granite has a phaneritic texture. This means that it has crystals 1-10 mm. It was formed from slow cooling, viscous magma, and/or good nucleation. Crystalline. Coarse-grained. Crystals visible without magnification.
Plutonic rocks are characterized by which type of texture?
Plutonic rocks have a phaneritic texture. It is characterized by interlocking crystals of several minerals that are easily visible and randomly distributed. .
Describe and explain the difference in the crystalline texture of volcanic rock and rock formed from an intrusion?
The texture of intrusive igneous rocks is phaneritic, which is characterized by coarse-grained large crystals that are visible to the naked eye. The texture of volcanic rocks, meanwhile, is porphyritic, which is characterized by fine-grained crystals.
Is mars visible with the unaided eye?
Yes it is.
When all the grains in a rock are easy to see the rock is described as what?
Visible crystals or grains would be referred to as a coarse grained texture.
When all the grains in a rock are easy to see the rock is described as?
Visible crystals or grains would be referred to as a coarse grained texture.
