6 Which of the Following Igneous Rocks Exhibit Aphanitic Texture

Natural glass is closest in texture to aphanitic rocks and can be porphyritic if there are phenocrysts in a matrix of glass. Wic of te following igneous rocks exibit coarse grained texture.

Solved Match The Igneous Rock Textures 1 2 3 Aphanitic Chegg Com

In other cases different minerals may grow to distinctly different sizes.

. Plutonic rocks form when magma cools within the Earths crust. Why are lava flows typically finer-grained than intrusive igneous rocks. The consolidation of such material into rocks produces what is called the pyroclastic texture.

Natural glass can be any composition see below but the term obsidian is reserved for high-silica compositions. Which of the following pairs of igneous rocks exhibit aphanitic texture. Porphyritic texture A phenocrysts B matrix 11.

2 In an igneous rock with a phaneritic texture the mineral grains are visible to the unaided eye. Intrusive magma flows onto the Earths surface and cools very slowly allowing many small mineral grains to grow. 2 None of these.

The magma that has reached the earths surface through cracks and fissures is called lava. 3 Olivine and quartz commonly crystallize together from mafic or basaltic magmas. 1 Mafic is a magmarock that is rich in feldspar and silica quartz whereas felsic refers to thatwhich is rich in Fe and Mg.

Magma is a mixture of liquid rock crystals and gas. Crystal size primarily reflects the rate of cooling but is also often strongly affected by rock composition especially water or gas content. The result is a rock composed of volcanic glass called obsidianExamples of obsidian appeared in Figures 121 Chapter 1 and Figure 45 Chapter 4.

The extrusive magma because it is deep below the surface cools very slowly producing very small mineral grains. Volcanic or extrusive igneous rocks form when the magma cools and crystallizes on the surface of the Earth. Magma is made up largely of mutual solutions of.

Intrusive igneous rocks thus have coarse-grained or phaneritic textures with visible crystals and extrusive igneous rocks have fine-grained or aphanitic texture. The rate of cooling of the magma is slow allowing large crystals to grow. Formation of Igneous Rocks.

This preview shows page 1 - 3 out of 7 pages. Basalt is the aphanitic or fine-grained equivalent of gabbro. Most lava crystallizes to form igneous rocks with phaneritic coarse-grained textures.

4 Most lava crystallizes to form igneous rocks with phaneritic textures. Below is a photograph of a piece of rock collected from a solidified lava flow. Magma is the parent material of igneous rocks.

The environment of formation produces characteristic textures in igneous rocks which aid in their identification. Aporphyritic Baphanitic Cpegmatitic Dphaneritic Epyroclastic Match the rocks to their equivalent aphanitic or phaneritic igneous rocks. Sometimes material is violently ejected from volcanoes and then reassembled into igneous rocks from this material.

Intrusive or plutonic igneous rocks wherein the magma crystallizes at depth in the Earth. The extrusive magma cools quickly so the mineral grains do not have time to grow. A granite gabbro B andesite rhyolite C andesite diorite D rhyolite gabbro 12 Visible quartz and potassium feldspar grains are the main constituents in a.

There are six main types of textures. 3 Mafic is hard rock felsic is soft rock. Rocksthat contain crystals that are roughly equal in size and can be identified visuallywithout the aid of a microscope are said to exhibit this texture.

Aporphyritic Bpyroclastic Cpegmatitic Daphanitic Ephaneritic 10. When a rock has a two-stage cooling history slow then fast it is is _____. Eye is said to exhibit a _____ texture.

Which volcanic rock is extremely vesicular and glassy. Sometimes extrusive igneous rocks cool so quickly that no crystals form. Pumice is also natural glass but it is full of bubbles.

Plutonic rocks are characteristically coarse-grained. Also what influences the texture of igneous rocks. Geologists like igneous textures because they reveal so much about how a rock formed.

They include two types. The first set of textures focuses on the size of mineral crystals. An extrusive igneous rock composed of crystals that are so small that you can not detect them with the naked eye is said to exhibit an _____ texture.

Aphanitic a not phaner visible rocks in contrast to phaneritic rocks typically form from lava which crystallize rapidly on or near Earths surface. Because the extrusive magma cools quickly and mineral grains do not have time to grow. 4 Mafic is a magmarock that is rich in Fe and Mg whereas felsic refers to that which is rich in feldspar and silica quartz 5 Mafic rocks are composed of sand felsic rocks are composed.

Volcanic glass called obsidian forms when lava is quenched and solidified so quickly that the silicate ions in the melt form no orderly atomic structure. Textures of igneous rocks. Obsidian is typically very dark in color.

Phaneritic aphanitic porphyritic glassy pyroclastic and pegmatitic. This is especially likely to happen if lava meets water. The material may range from fine dust or fine hair-like strands to large molten blobs.

Granite has a texture most like. Igneous Rocks are formed by crystallization from a liquid or magma. Basalt is another igneous rock with the aphanitic texture.

C ultramafic composition D phaneritic texture 11 Which of the following igneous rocks exhibit aphanitic texture. It is a complex high temperature solution which is liquid or molten rock present at considerable depth within the earth. Aphanitic AY-fa-NIT-ic rocks have mineral grains that are mostly too small to be seen with the naked eye or a hand lens like this rhyolite.

Geology Fundamentals Identifying Igneous Rocks In The Field Geology For Investors