Is Granite Aphanitic Or Phaneritic

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.

Is granite aphanitic or phaneritic.

The photo below shows a close up of the texture of this pink granite. The pink k feldspar light gray plagioclase and black amphibole are the most obvious minerals here. Igneous textures include the rock textures occurring in igneous rocks igneous textures are used by geologists in determining the mode of origin igneous rocks and are used in rock classification. Grains of rock are too small to see characteristic of a rock define phaneritic.

Phaneritic texture is sometimes referred to as coarse grained igneous texture. The different colors are unique minerals. The whole barn wall is shown in the thumb image on the igneous rocks page. Granite the most well known example of an intrusive igneous rock has a phaneritic texture.

Granite is a classic coarse grained phaneritic intrusive igneous rock. John getty images phaneritic fan a rit ic rocks have mineral grains that are large enough to be seen with the naked eye or a hand lens like this granite. Grains are large enough to see characteristic of a rock true false mt. The texture of an igneous rock made up entirely of crystals big enough to be easily seen with the naked eye is phaneritic.

These rocks are also intrusive. Intrusive igneous rocks thus have coarse grained or phaneritic textures with visible crystals and extrusive igneous rocks have fine grained or aphanitic texture. Granite course grained phaneritic one of the best known and most abundant igneous rocks 10 20 quartz roughly 50 potassium feldspar small amounts of 10 dark silicates. Granite is a phaneritic rock.

The black colors are likely two or three different minerals. If magma cools slowly deep within the crust the resulting rock is called intrusive or plutonic. There are six main types of textures. In contrast the crystals in an aphanitic rock are too small to be seen with the naked eye.

Granite is phaneritic rhyolite is aphanitic. Quartz is harder to spot in the photo. Phaneritic aphanitic porphyritic glassy pyroclastic and pegmatitic. Other phaneritic rocks include diorite gabbro and periodite.